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Diff for /OpenXM_contrib/gmp/Attic/configure.in between version 1.1.1.1 and 1.1.1.4

version 1.1.1.1, 2000/01/10 15:35:21 version 1.1.1.4, 2003/08/25 16:05:58
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 # This file is a shell script fragment that supplies the information  dnl  Process this file with autoconf to produce a configure script.
 # necessary for a configure script to process the program in  
 # this directory.  For more information, look at ../configure.  
   
 configdirs="mpn mpz mpf mpq mpbsd"  
 srctrigger=gmp-impl.h  
 srcname="GNU Multi-Precision library"  
   
 # per-host:  AC_COPYRIGHT([
   
 # per-target:  Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002 Free Software
   Foundation, Inc.
   
 case "${target}" in  This file is part of the GNU MP Library.
   sparc8* | microsparc*)  
     if [ x$with_gcc != xno ]  The GNU MP Library is free software; you can redistribute it and/or modify
     then  it under the terms of the GNU Lesser General Public License as published
       target_makefile_frag=config/mt-sprc8-gcc  by the Free Software Foundation; either version 2.1 of the License, or (at
   your option) any later version.
   
   The GNU MP Library is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
   License for more details.
   
   You should have received a copy of the GNU Lesser General Public License
   along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
   MA 02111-1307, USA.
   ])
   
   
   AC_REVISION($Revision$)
   AC_PREREQ(2.52)
   AC_INIT(gmp-impl.h)
   m4_pattern_forbid([^[ \t]*GMP_])
   m4_pattern_forbid([^[ \t]*MPFR_CONFIGS])
   m4_pattern_allow(GMP_LDFLAGS)
   m4_pattern_allow(GMP_LIMB_BITS)
   m4_pattern_allow(GMP_MPARAM_H_SUGGEST)
   m4_pattern_allow(GMP_NAIL_BITS)
   m4_pattern_allow(GMP_NUMB_BITS)
   
   # If --target is not used then $target_alias is empty, but if say
   # "./configure athlon-pc-freebsd3.5" is used, then all three of
   # $build_alias, $host_alias and $target_alias are set to
   # "athlon-pc-freebsd3.5".
   #
   if test -n "$target_alias" && test "$target_alias" != "$host_alias"; then
     AC_MSG_ERROR([--target is not appropriate for GMP
   Use --build=CPU-VENDOR-OS if you need to specify your CPU and/or system
   explicitly.  Use --host if cross-compiling (see "Installing GMP" in the
   manual for more on this).])
   fi
   
   GMP_INIT(config.m4)
   
   AC_CANONICAL_HOST
   tmp_host=`echo $host_cpu | sed 's/\./_/'`
   AC_DEFINE_UNQUOTED(HAVE_HOST_CPU_$tmp_host)
   GMP_DEFINE_RAW("define_not_for_expansion(\`HAVE_HOST_CPU_$tmp_host')", POST)
   
   AM_INIT_AUTOMAKE(gmp, GMP_VERSION)
   AM_CONFIG_HEADER(config.h:config.in)
   AM_MAINTAINER_MODE
   
   
   AC_ARG_ENABLE(assert,
   AC_HELP_STRING([--enable-assert],[enable ASSERT checking [[default=no]]]),
   [case $enableval in
   yes|no) ;;
   *) AC_MSG_ERROR([bad value $enableval for --enable-assert, need yes or no]) ;;
   esac],
   [enable_assert=no])
   
   if test "$enable_assert" = "yes"; then
     AC_DEFINE(WANT_ASSERT,1,
     [./configure --enable-assert option, to enable some ASSERT()s])
   fi
   
   
   AC_ARG_ENABLE(alloca,
   AC_HELP_STRING([--enable-alloca],[how to get temp memory [[default=reentrant]]]),
   [case $enableval in
   alloca|malloc-reentrant|malloc-notreentrant) ;;
   yes|no|reentrant|notreentrant) ;;
   debug) ;;
   *)
     AC_MSG_ERROR([bad value $enableval for --enable-alloca, need one of:
   yes no reentrant notreentrant alloca malloc-reentrant malloc-notreentrant debug]) ;;
   esac],
   [enable_alloca=reentrant])
   
   
   # IMPROVE ME: The default for C++ is disabled.  The tests currently
   # performed below for a working C++ compiler are not particularly strong,
   # and in general can't be expected to get the right setup on their own.  The
   # most significant problem is getting the ABI the same.  Defaulting CXXFLAGS
   # to CFLAGS takes only a small step towards this.  It's also probably worth
   # worrying whether the C and C++ runtimes from say gcc and a vendor C++ can
   # work together.  Some rather broken C++ installations were encountered
   # during testing, and though such things clearly aren't GMP's problem, if
   # --enable-cxx=detect were to be the default then some careful checks of
   # which, if any, C++ compiler on the system is up to scratch would be
   # wanted.
   #
   AC_ARG_ENABLE(cxx,
   AC_HELP_STRING([--enable-cxx],[enable C++ support [[default=no]]]),
   [case $enableval in
   yes|no|detect) ;;
   *) AC_MSG_ERROR([bad value $enableval for --enable-cxx, need yes/no/detect]) ;;
   esac],
   [enable_cxx=no])
   
   
   AC_ARG_ENABLE(fft,
   AC_HELP_STRING([--enable-fft],[enable FFTs for multiplication [[default=yes]]]),
   [case $enableval in
   yes|no) ;;
   *) AC_MSG_ERROR([bad value $enableval for --enable-fft, need yes or no]) ;;
   esac],
   [enable_fft=yes])
   
   if test "$enable_fft" = "yes"; then
     AC_DEFINE(WANT_FFT,1,
     [./configure --enable-fft option, to enable FFTs for multiplication])
   fi
   
   
   AC_ARG_ENABLE(mpbsd,
   AC_HELP_STRING([--enable-mpbsd],
                  [build Berkley MP compatibility library [[default=no]]]),
   [case $enableval in
   yes|no) ;;
   *) AC_MSG_ERROR([bad value $enableval for --enable-mpbsd, need yes or no]) ;;
   esac],
   [enable_mpbsd=no])
   AM_CONDITIONAL(WANT_MPBSD, test "$enable_mpbsd" = "yes")
   
   
   AC_ARG_ENABLE(mpfr,
   AC_HELP_STRING([--enable-mpfr],[build MPFR [[default=no]]]),
   [case $enableval in
   yes|no) ;;
   *) AC_MSG_ERROR([bad value $enableval for --enable-mpfr, need yes or no]) ;;
   esac],
   [enable_mpfr=no])
   AM_CONDITIONAL(WANT_MPFR, test "$enable_mpfr" = "yes")
   
   
   AC_ARG_ENABLE(nails,
   AC_HELP_STRING([--enable-nails],[use nails on limbs [[default=no]]]),
   [case $enableval in
   [yes|no|[0-9]|[0-9][0-9]]) ;;
   *) AC_MSG_ERROR([bad value $enableval for --enable-nails, need yes/no/number]) ;;
   esac],
   [enable_nails=no])
   
   case $enable_nails in
   yes) GMP_NAIL_BITS=2 ;;
   no)  GMP_NAIL_BITS=0 ;;
   *)   GMP_NAIL_BITS=$enable_nails ;;
   esac
   AC_SUBST(GMP_NAIL_BITS)
   
   
   AC_ARG_ENABLE(profiling,
   AC_HELP_STRING([--enable-profiling],
                  [build with profiler support [[default=no]]]),
   [case $enableval in
   no|prof|gprof) ;;
   *) AC_MSG_ERROR([bad value $enableval for --enable-profiling, need no/prof/gprof]) ;;
   esac],
   [enable_profiling=no])
   
   GMP_DEFINE_RAW(["define(<WANT_PROFILING>,<\`$enable_profiling'>)"])
   
   # -fomit-frame-pointer is incompatible with -pg, on x86s at least
   if test "$enable_profiling" = gprof; then
     fomit_frame_pointer=
   else
     fomit_frame_pointer="-fomit-frame-pointer"
   fi
   
   
   AC_ARG_WITH(readline,
   AC_HELP_STRING([--with-readline],
                  [readline support in calc demo program [[default=detect]]]),
   [case $withval in
   yes|no|detect) ;;
   *) AC_MSG_ERROR([bad value $withval for --with-readline, need yes/no/detect]) ;;
   esac],
   [with_readline=detect])
   
   
   
   # Table of compilers, options, and mpn paths.  This code has various related
   # purposes
   #
   #   - better default CC/CFLAGS selections than autoconf otherwise gives
   #   - default CC/CFLAGS selections for extra CPU types specific to GMP
   #   - a few tests for known bad compilers
   #   - choice of ABIs on suitable systems
   #   - selection of corresponding mpn search path
   #
   # After GMP specific searches and tests, the standard autoconf AC_PROG_CC is
   # called.  User selections of CC etc are respected.
   #
   # Care is taken not to use macros like AC_TRY_COMPILE during the GMP
   # pre-testing, since they of course depend on AC_PROG_CC, and also some of
   # them cache their results, which is not wanted.
   #
   # The ABI selection mechanism is unique to GMP.  All that reaches autoconf
   # is a different selection of CC/CFLAGS according to the best ABI the system
   # supports, and/or what the user selects.  Naturally the mpn assembler code
   # selected is very dependent on the ABI.
   #
   # The closest the standard tools come to a notion of ABI is something like
   # "sparc64" which encodes a CPU and an ABI together.  This doesn't seem to
   # scale well for GMP, where exact CPU types like "ultrasparc2" are wanted,
   # separate from the ABI used on them.
   #
   #
   # The variables set here are
   #
   #   cclist              the compiler choices
   #   xx_cflags           flags for compiler xx
   #   xx_cppflags         cpp flags for compiler xx
   #   xx_cflags_optlist   list of sets of optional flags
   #   xx_cflags_yyy       set yyy of optional flags for compiler xx
   #   xx_ldflags          -Wc,-foo flags for libtool linking with compiler xx
   #   ar_flags            extra flags for $AR
   #   nm_flags            extra flags for $NM
   #   limb                limb size, can be "longlong"
   #   path                mpn search path
   #   extra_functions     extra mpn functions
   #
   # Suppose xx_cflags_optlist="arch", then flags from $xx_cflags_arch are
   # tried, and the first flag that works will be used.  An optlist like "arch
   # cpu optimize" can be used to get multiple independent sets of flags tried.
   # The first that works from each will be used.  If no flag in a set works
   # then nothing from that set is added.
   #
   # For multiple ABIs, the scheme extends as follows.
   #
   #   abilist               set of ABI choices
   #   cclist_aa             compiler choices in ABI aa
   #   xx_aa_cflags          flags for xx in ABI aa
   #   xx_aa_cppflags        cpp flags for xx in ABI aa
   #   xx_aa_cflags_optlist  list of sets of optional flags in ABI aa
   #   xx_aa_cflags_yyy      set yyy of optional flags for compiler xx in ABI aa
   #   xx_aa_ldflags         -Wc,-foo flags for libtool linking
   #   ar_aa_flags           extra flags for $AR in ABI aa
   #   nm_aa_flags           extra flags for $NM in ABI aa
   #   limb_aa               limb size in ABI aa, can be "longlong"
   #   path_aa               mpn search path in ABI aa
   #   extra_functions_aa    extra mpn functions in ABI aa
   #
   # As a convenience, the unadorned xx_cflags (etc) are used for the last ABI
   # in ablist, if an xx_aa_cflags for that ABI isn't given.  For example if
   # abilist="64 32" then $cc_64_cflags will be used for the 64-bit ABI, but
   # for the 32-bit either $cc_32_cflags or $cc_cflags is used, whichever is
   # defined.  This makes it easy to add some 64-bit compilers and flags to an
   # unadorned 32-bit set.
   #
   # limb=longlong (or limb_aa=longlong) applies to all compilers within that
   # ABI.  It won't work to have some needing long long and some not, since a
   # single instantiated gmp.h will be used by both.
   #
   # SPEED_CYCLECOUNTER, cyclecounter_size and CALLING_CONVENTIONS_OBJS are
   # also set here, with an ABI suffix.
   #
   #
   #
   # A table-driven approach like this to mapping cpu type to good compiler
   # options is a bit of a maintenance burden, but there's not much uniformity
   # between options specifications on different compilers.  Some sort of
   # separately updatable tool might be cute.
   #
   # The use of lots of variables like this, direct and indirect, tends to
   # obscure when and how various things are done, but unfortunately it's
   # pretty much the only way.  If shell subroutines were portable then actual
   # code like "if this .. do that" could be written, but attempting the same
   # with full copies of GMP_PROG_CC_WORKS etc expanded at every point would
   # hugely bloat the output.
   
   
   AC_ARG_VAR(ABI, [desired ABI (for processors supporting more than one ABI)])
   
   # abilist needs to be non-empty, "standard" is just a generic name here
   abilist="standard"
   
   # FIXME: We'd like to prefer an ANSI compiler, perhaps by preferring
   # c89 over cc here.  But note that on HP-UX c89 provides a castrated
   # environment, and would want to be excluded somehow.  Maybe
   # AC_PROG_CC_STDC already does enough to stick cc into ANSI mode and
   # we don't need to worry.
   #
   cclist="gcc cc"
   
   gcc_cflags="-g -O2"
   gcc_64_cflags="-g -O2"
   cc_cflags="-O"
   cc_64_cflags="-O"
   
   SPEED_CYCLECOUNTER_OBJ=
   cyclecounter_size=2
   
   AC_SUBST(HAVE_HOST_CPU_FAMILY_power,  0)
   AC_SUBST(HAVE_HOST_CPU_FAMILY_powerpc,0)
   
   case $host in
   
     a29k*-*-*)
       path="a29k"
       ;;
   
   
     alpha*-*-*)
       case $host_cpu in
         alphaev5* | alphapca5*) path="alpha/ev5 alpha" ;;
         alphaev6*)             path="alpha/ev6 alpha/ev5 alpha" ;;
         *)                     path="alpha" ;;
       esac
       extra_functions="cntlz"
       gcc_cflags_optlist="cpu asm"
   
       # gcc 2.7.2.3 doesn't know any -mcpu= for alpha, apparently.
       # gcc 2.95 and 3.0 know ev4, ev5, ev56, pca56, ev6.
       # gcc 3.1 pre-releases add ev67.
       #
       case $host_cpu in
         alpha)        gcc_cflags_cpu="-mcpu=ev4" ;;
         alphaev5)     gcc_cflags_cpu="-mcpu=ev5" ;;
         alphaev56)    gcc_cflags_cpu="-mcpu=ev56" ;;
         alphapca56 | alphapca57)
                       gcc_cflags_cpu="-mcpu=pca56" ;;
         alphaev6)     gcc_cflags_cpu="-mcpu=ev6" ;;
         alphaev67 | alphaev68)
                       gcc_cflags_cpu="-mcpu=ev67 -mcpu=ev6" ;;
       esac
   
       # On old versions of gcc, which don't know -mcpu=, we believe an
       # explicit -Wa,-mev5 etc will be necessary to put the assembler in
       # the right mode for our .asm files and longlong.h asm blocks.
       #
       # On newer versions of gcc, when -mcpu= is known, we must give a
       # -Wa which is at least as high as the code gcc will generate,
       # since the options ordering seems to make our setting override
       # that passed by gcc.
       #
       # gas prior to 2.14 doesn't accept -mev67, but -mev6 seems enough for
       # ctlz and cttz (in 2.10.0 at least).
       #
       # OSF `as' accepts ev68 but stupidly treats it as ev4.  -arch only seems
       # to affect insns like ldbu which are expanded as macros when necessary.
       # Insns like ctlz which were never available as macros are always
       # accepted and always generate their plain code.
       #
       case $host_cpu in
         alpha)        gcc_cflags_asm="-Wa,-arch,ev4 -Wa,-mev4" ;;
         alphaev5)     gcc_cflags_asm="-Wa,-arch,ev5 -Wa,-mev5" ;;
         alphaev56)    gcc_cflags_asm="-Wa,-arch,ev56 -Wa,-mev56" ;;
         alphapca56 | alphapca57)
                       gcc_cflags_asm="-Wa,-arch,pca56 -Wa,-mpca56" ;;
         alphaev6)     gcc_cflags_asm="-Wa,-arch,ev6 -Wa,-mev6" ;;
         alphaev67 | alphaev68)
                       gcc_cflags_asm="-Wa,-arch,ev67 -Wa,-mev67 -Wa,-arch,ev6 -Wa,-mev6" ;;
       esac
   
       # It might be better to ask "cc" whether it's Cray C or DEC C,
       # instead of relying on the OS part of $host.  But it's hard to
       # imagine either of those compilers anywhere except their native
       # systems.
       #
       case $host in
         *-cray-unicos*)
           cc_cflags="-O"          # no -g, it silently disables all optimizations
           GMP_INCLUDE_MPN(alpha/unicos.m4)
           # Don't perform any assembly syntax tests on this beast.
           gmp_asm_syntax_testing=no
           ;;
         *-*-osf*)
           GMP_INCLUDE_MPN(alpha/default.m4)
           cc_cflags=""
           cc_cflags_optlist="opt cpu"
   
           # not sure if -fast works on old versions, so make it optional
           cc_cflags_opt="-fast -O2"
   
           # DEC C V5.9-005 knows ev4, ev5, ev56, pca56, ev6.
           # Compaq C V6.3-029 adds ev67.
           #
           case $host_cpu in
             alpha)       cc_cflags_cpu="-arch~ev4~-tune~ev4" ;;
             alphaev5)    cc_cflags_cpu="-arch~ev5~-tune~ev5" ;;
             alphaev56)   cc_cflags_cpu="-arch~ev56~-tune~ev56" ;;
             alphapca56 | alphapca57)
                          cc_cflags_cpu="-arch~pca56~-tune~pca56" ;;
             alphaev6)    cc_cflags_cpu="-arch~ev6~-tune~ev6" ;;
             alphaev67 | alphaev68)
                          cc_cflags_cpu="-arch~ev67~-tune~ev67 -arch~ev6~-tune~ev6" ;;
           esac
           ;;
         *)
           GMP_INCLUDE_MPN(alpha/default.m4)
           ;;
       esac
   
       case $host in
         *-*-unicos*)
           # tune/alpha.asm assumes int==4bytes but unicos uses int==8bytes
           ;;
         *)
           SPEED_CYCLECOUNTER_OBJ=alpha.lo
           cyclecounter_size=1 ;;
       esac
       ;;
   
   
     # Cray vector machines.
     # This must come after alpha* so that we can recognize present and future
     # vector processors with a wildcard.
     *-cray-unicos*)
       gmp_asm_syntax_testing=no
       cclist="cc"
       # We used to have -hscalar0 here as a workaround for miscompilation of
       # mpz/import.c, but let's hope Cray fixes their bugs instead, since
       # -hscalar0 causes disastrously poor code to be generated.
       cc_cflags="-O3 -hnofastmd -htask0 -Wa,-B"
       path="cray"
       ;;
   
   
     arm*-*-*)
       path="arm"
       gcc_cflags="$gcc_cflags $fomit_frame_pointer"
       gcc_testlist="gcc-arm-umodsi"
       extra_functions="udiv"
       GMP_INCLUDE_MPN(arm/arm-defs.m4)
       ;;
   
   
     clipper*-*-*)
       path="clipper"
       ;;
   
   
     # Fujitsu
     [f30[01]-fujitsu-sysv*])
       cclist="gcc vcc"
       # FIXME: flags for vcc?
       vcc_cflags="-g"
       path="fujitsu"
       ;;
   
   
     hppa*-*-*)
       # HP cc is K&R by default, but AM_C_PROTOTYPES will add "-Ae", or "-Aa
       # -D_HPUX_SOURCE", to put it into ansi mode, if possible.
   
       # default to pa7100
       gcc_cflags="-g -O2"
       gcc_cflags_optlist="arch"
       gcc_cflags_arch="-mpa-risc-1-1"
       cc_cflags="+DA1.1 +O2"
       path="pa32/hppa1_1/pa7100 pa32/hppa1_1 pa32"
       extra_functions="udiv_qrnnd"
   
       SPEED_CYCLECOUNTER_OBJ=hppa.lo
       cyclecounter_size=1
   
       case $host in
         hppa1.0*-*-*)
           # override back to plain 1.0
           gcc_cflags_optlist=
           cc_cflags="+O2"
           path="pa32"
           ;;
         hppa7000*-*-*)
           path="pa32/hppa1_1 pa32"
           ;;
   
         hppa2.0*-*-*)
           abilist="2.0n 1.0"
   
           # FIXME: It's suspected that an assembler feature test might be
           # necessary before -mpa-risc-2-0 can be enabled, since it's not
           # clear (as of gcc 2.95.2) whether that option always gives an
           # explicit ".level 2.0" or whatever to the assembler.  In any case,
           # under gcc 2.95.2 it only enables a few extra floating point insns,
           # so it's not very important.
           #
           # gmp_cflags_arch="-mpa-risc-2-0 -mpa-risc-1-1"
   
           # FIXME: path should be "pa32/hppa2_0 pa32/hppa1_1 pa32"
           path="pa32/hppa2_0 pa32/hppa1_1/pa7100 pa32/hppa1_1 pa32"
   
           # no gcc support for long long in 2.0n
           cclist_20n="cc"
           # +O3 causes problems with fp rounding in mpfr/tests/tdiv.
           cc_20n_cflags="+DA2.0 +e +O2"
           cc_20n_testlist="hpc-hppa-2-0"
           path_20n="pa64"
           limb_20n=longlong
           extra_functions_20n="umul_ppmm udiv_qrnnd"
           SPEED_CYCLECOUNTER_OBJ_20n=hppa2.lo
           cyclecounter_size_20n=2
   
           # ABI=2.0w is available for hppa2.0w and hppa2.0, but not for hppa2.0n.
           case $host in
           hppa2.0n-*-*) ;;
           *)
             # HPUX 11 or up is required to run 2.0w.  Not sure about other
             # systems (GNU/Linux for instance), but lets assume they're ok.
             case $host in
             [*-*-hpux1[1-9]*]) abilist="2.0w $abilist" ;;
             *-*-hpux*)                                 ;;
             *)                 abilist="2.0w $abilist" ;;
             esac
   
             # gcc support for 2.0w is in progress
             cclist_20w="cc"
             cc_20w_cflags="+DD64 +O2" # +O3 causes problems with fp rounding in mpfr/tests/tdiv.
             cc_20w_testlist="hpc-hppa-2-0"
             path_20w="pa64"
             extra_functions_20w="umul_ppmm udiv_qrnnd"
             SPEED_CYCLECOUNTER_OBJ_20w=hppa2w.lo
             cyclecounter_size_20w=2
             ;;
           esac
           ;;
       esac
       ;;
   
   
     i960*-*-*)
       path="i960"
       ;;
   
   
     ia64*-*-*)
       path="ia64"
       GMP_INCLUDE_MPN(ia64/default.m4)
       SPEED_CYCLECOUNTER_OBJ=ia64.lo
       ;;
   
   
     # Motorola 68k
     #
     m68*-*-*)
       GMP_INCLUDE_MPN(m68k/m68k-defs.m4)
       gcc_cflags="-g $fomit_frame_pointer"
       gcc_cflags_optlist="optimize arch"
       gcc_cflags_optimize="-O2"   # munged below on gcc 2.95.x
   
       # gcc 2.7.2 doesn't know -m68060 or -mcpu32, so let them fall back
       # appropriately.
       # FIXME: Maybe "-m68020 -mnobitfield" would suit cpu32 on 2.7.2.
       #
       case $host in
       m68020-*-*)  gcc_cflags_arch="-m68020" ;;
       m68030-*-*)  gcc_cflags_arch="-m68030" ;;
       m68040-*-*)  gcc_cflags_arch="-m68040" ;;
       m68060-*-*)  gcc_cflags_arch="-m68060 -m68040" ;;
       m68360-*-*)  gcc_cflags_arch="-mcpu32 -m68000" ;;
       *)           gcc_cflags_arch="-m68000" ;;
       esac
   
       # FIXME: m68k/mc68020 looks like it's ok for cpu32, but this wants to be
       # tested.  Will need to introduce an m68k/cpu32 if m68k/mc62020 ever uses
       # the bitfield instructions.
       case $host in
       [m680[2346]0-*-* | m68360-*-*])  path="m68k/mc68020 m68k"
                                        extra_functions="udiv umul" ;;
       *)                               path="m68k" ;;
       esac
       ;;
   
   
     # Motorola 88k
     m88k*-*-*)
       path="m88k"
       ;;
     m88110*-*-*)
       # FIXME: Use `-O2'?
       gcc_cflags="-g -O -m88110"
       path="m88k/mc88110 m88k"
       ;;
   
   
     # National Semiconductor 32k
     ns32k*-*-*)
       path="ns32k"
       ;;
   
   
     # IRIX 5 and earlier can only run 32-bit o32.
     #
     # IRIX 6 and up always has a 64-bit mips CPU can run n32 or 64.  n32 is
     # preferred over 64, but only because that's been the default in past
     # versions of GMP.  The two are equally efficient.
     #
     # Linux kernel 2.2.13 arch/mips/kernel/irixelf.c has a comment about not
     # supporting n32 or 64.
     #
     # FIXME: It's necessary to pass -mabi or -n32 to the compiler when
     # linking.  Libtool used to strip them, hence the ldflags here.  It
     # looks like it has something equivalent itself now, so perhaps
     # these can be removed.
     #
     mips*-*-*)
       abilist="o32"
       gcc_cflags_optlist="abi"
       gcc_cflags_abi="-mabi=32"
       gcc_testlist="gcc-mips-o32"
       path="mips32"
       cc_cflags="-O2 -o32"   # no -g, it disables all optimizations
       extra_functions="umul"
       # this suits both mips32 and mips64
       GMP_INCLUDE_MPN(mips32/mips-defs.m4)
   
       case $host in
         mips64*-*-* | mips*-*-irix[6789]*)
           abilist="n32 64 o32"
   
           cclist_n32="gcc cc"
           gcc_n32_cflags="-g -O2 -mabi=n32"
           gcc_n32_ldflags="-Wc,-mabi=n32"
           # Pass just -O1, MIPSpro 7.2.1 miscompiles mpn/generic/divrem_1.c
           # cvs version 1.20, for -O2 and -O3
           cc_n32_cflags="-O1 -n32"        # no -g, it disables all optimizations
           cc_n32_ldflags="-Wc,-n32"
           limb_n32=longlong
           path_n32="mips64"
           extra_functions_n32="umul"
   
           cclist_64="gcc cc"
           gcc_64_cflags="-g -O2 -mabi=64"
           gcc_64_ldflags="-Wc,-mabi=64"
           cc_64_cflags="-O2 -64"          # no -g, it disables all optimizations
           cc_64_ldflags="-Wc,-64"
           path_64="mips64"
           extra_functions_64="umul"
           ;;
       esac
       ;;
   
   
     # Darwin (powerpc-apple-darwin1.3) has gcc installed as cc.
     #
     # The darwin assembler doesn't accept "-mppc", so gcc_cflags_asm is
     # optional.  The right flag would be "-arch ppc" or some such, but that's
     # already the default.
     #
     # The darwin pre-compiling preprocessor is disabled with -no-cpp-precomp
     # since it doesn't like "__attribute__ ((mode (SI)))" etc in gmp-impl.h,
     # and so always ends up running the plain preprocessor anyway.  This could
     # be done in CPPFLAGS rather than CFLAGS, but there's not many places
     # preprocessing is done separately, and this is only a speedup, the normal
     # preprocessor gets run if there's any problems.
     #
     powerpc*-*-*)
       AC_DEFINE(HAVE_HOST_CPU_FAMILY_powerpc)
       HAVE_HOST_CPU_FAMILY_powerpc=1
       cclist="gcc cc"
       cc_cflags="-g -O2"
       gcc_cflags="-g -O2 -mpowerpc"
       gcc_cflags_optlist="asm precomp cpu"
       gcc_cflags_asm="-Wa,-mppc"
       gcc_cflags_precomp="-no-cpp-precomp"
       extra_functions="umul"
   
       case $host_cpu in
         powerpc740 | powerpc750 | powerpc7400)
           path="powerpc32/750 powerpc32" ;;
         *)
           path="powerpc32" ;;
       esac
   
       # gcc 2.7.2 knows -mcpu=403, 603, 604.
       # gcc 2.95 adds 401, 505, 602, 603e, ec603e, 604e, 620, 740, 750,
       #   801, 821, 823, 860.
       # gcc 3.0 adds 630, rs64a.
       # gcc 3.1 pre-releases add 405, 7400, 7450.
       #
       # FIXME: The way 603e falls back to 603 for gcc 2.7.2 should be
       # done for all the others too.  But what would be the correct
       # arrangements?
       #
       case $host_cpu in
         powerpc401)   gcc_cflags_cpu="-mcpu=401" ;;
         powerpc403)   gcc_cflags_cpu="-mcpu=403" ;;
         powerpc405)   gcc_cflags_cpu="-mcpu=405" ;;
         powerpc505)   gcc_cflags_cpu="-mcpu=505" ;;
         powerpc602)   gcc_cflags_cpu="-mcpu=602" ;;
         powerpc603)   gcc_cflags_cpu="-mcpu=603" ;;
         powerpc603e)  gcc_cflags_cpu="-mcpu=603e -mcpu=603" ;;
         powerpc604)   gcc_cflags_cpu="-mcpu=604" ;;
         powerpc604e)  gcc_cflags_cpu="-mcpu=604e -mcpu=604" ;;
         powerpc620)   gcc_cflags_cpu="-mcpu=620" ;;
         powerpc630)   gcc_cflags_cpu="-mcpu=630" ;;
         powerpc740)   gcc_cflags_cpu="-mcpu=740" ;;
         powerpc7400)  gcc_cflags_cpu="-mcpu=7400" ;;
         powerpc7450)  gcc_cflags_cpu="-mcpu=7450" ;;
         powerpc750)   gcc_cflags_cpu="-mcpu=750" ;;
         powerpc801)   gcc_cflags_cpu="-mcpu=801" ;;
         powerpc821)   gcc_cflags_cpu="-mcpu=821" ;;
         powerpc823)   gcc_cflags_cpu="-mcpu=823" ;;
         powerpc860)   gcc_cflags_cpu="-mcpu=860" ;;
       esac
   
       case $host in
         *-*-aix*)
           cclist="gcc xlc cc"
           xlc_cflags="-g -O2 -qmaxmem=20000"
           xlc_cflags_optlist="arch"
   
           # xlc (what version?) knows -qarch=ppc, ppcgr, 601, 602, 603, 604,
           # 403, rs64a
           # -qarch=ppc is needed, so ensure everything falls back to that.
           # FIXME: Perhaps newer versions know more flavours.
           #
           case $host_cpu in
             powerpc403)   xlc_cflags_arch="-qarch=403 -qarch=ppc" ;;
             powerpc602)   xlc_cflags_arch="-qarch=602 -qarch=ppc" ;;
             powerpc603)   xlc_cflags_arch="-qarch=603 -qarch=ppc" ;;
             powerpc603e)  xlc_cflags_arch="-qarch=603 -qarch=ppc" ;;
             powerpc604)   xlc_cflags_arch="-qarch=604 -qarch=ppc" ;;
             powerpc604e)  xlc_cflags_arch="-qarch=604 -qarch=ppc" ;;
             *)            xlc_cflags_arch="-qarch=ppc" ;;
           esac
           ;;
       esac
   
       case $host in
         POWERPC64_PATTERN)
           # On AIX a true 64-bit ABI is available.
           case $host in
             *-*-aix*)
               # Need -Wc to pass object type flags through to the linker.
               abilist="aix64 32"
               cclist_aix64="gcc xlc"
               gcc_aix64_cflags="-g -O2 -maix64 -mpowerpc64"
               gcc_aix64_cflags_optlist="cpu"
               gcc_aix64_ldflags="-Wc,-maix64"
               xlc_aix64_cflags="-g -O2 -q64 -qtune=pwr3 -qmaxmem=20000"
               xlc_aix64_ldflags="-Wc,-q64"
               # Must indicate object type to ar and nm
               ar_aix64_flags="-X64"
               nm_aix64_flags="-X64"
               path_aix64="powerpc64"
               extra_functions_aix64="umul"
               ;;
           esac
           ;;
       esac
       ;;
   
   
     # POWER
     [power-*-* | power[12]-*-* | power2sc-*-*])
       AC_DEFINE(HAVE_HOST_CPU_FAMILY_power)
       HAVE_HOST_CPU_FAMILY_power=1
       cclist="gcc"
       extra_functions="udiv_w_sdiv"
       path="power"
   
       gcc_cflags_optlist="cpu"
       case $host in
         power-*-*)    gcc_cflags_cpu="-mcpu=power -mpower" ;;
         power1-*-*)   gcc_cflags_cpu="-mcpu=rios1 -mpower" ;;
         power2-*-*)   gcc_cflags_cpu="-mcpu=rios2 -mpower" ;;
         power2sc-*-*) gcc_cflags_cpu="-mcpu=rsc   -mpower" ;;
       esac
       case $host in
       *-*-aix*)
         cclist="gcc xlc"
         xlc_cflags="-g -O2 -qarch=pwr -qmaxmem=20000"
         ;;
       esac
       ;;
   
   
     # FIXME: ppc601 isn't accepted by config.sub.
     ppc601-*-*)
       path="power powerpc32"
       ;;
   
   
     pyramid-*-*)
       path="pyr"
       ;;
   
   
     # IBM s/370 and similar
     [s3[6-9]0*-*-*])
       gcc_cflags="-g -O2 $fomit_frame_pointer"
       path="s390"
       extra_functions="udiv_w_sdiv"
       ;;
   
   
     sh-*-*)   path="sh" ;;
     sh2-*-*)  path="sh/sh2 sh" ;;
   
   
     *sparc*-*-*)
       # For cc and acc, -g disables -O, so it's not used
       cclist="gcc acc cc"
       path="sparc32"
       gcc_cflags="-g -O2"
       gcc_cflags_optlist="cpu"
       gcc_cflags_cpu=
       acc_cflags="-O2"
       cc_cflags="-O2"
       GMP_INCLUDE_MPN(sparc32/sparc-defs.m4)
   
       # FIXME: This should be selected according to the CPU
       if test x${floating_point} = xno
       then extra_functions="udiv_nfp"
       else extra_functions="udiv_fp"
     fi      fi
   
       case $host in
         sparcv8*-*-* | supersparc*-*-* | microsparc*-*-*)
           gcc_cflags_cpu="-mcpu=v8 -mv8"
           acc_cflags="-O2 -cg92"
           path="sparc32/v8 sparc32"
           extra_functions="udiv"
   
           case $host in
             *-*-solaris2.*)  cc_cflags="-xtarget=native -xarch=v8 -xO4" ;;
           esac
           case $host in
             supersparc*-*-*) path="sparc32/v8/supersparc sparc32/v8 sparc32" ;;
           esac
           ;;
   
         # sparc64-*-linux-gnu is a misnomer, since there's no support for any
         # 64-bit operations in user mode.  We assume that a future release
         # will have some 64-bit support and that the gcc options will be the
         # same as on solaris.
         #
         # cc -xarch actually controls the ABI, hence it must be v8 for 32-bit,
         # even though the chip is v9.
         #
         sparcv9*-*-* | ultrasparc*-*-* | sparc64-*-*)
           path="sparc32/v9 sparc32/v8 sparc32"
           extra_functions="udiv_fp"
   
           SPEED_CYCLECOUNTER_OBJ=sparcv9.lo
   
           gcc_cflags="-g -O2 -Wa,-xarch=v8plus"
           gcc_cflags_cpu="-mcpu=ultrasparc -mcpu=v9 -mcpu=v8 -mv8"
   
           cc_cflags="-xtarget=native -xarch=v8 -xO4"
   
           case $host in
             [*-*-solaris2.[7-9]])
               # solaris prior to 2.6 doesn't save registers properly, so the
               # 64-bit ABI is only available for 2.7 up
               abilist="64 32"
               path_64="sparc64"
               cclist_64="gcc cc"
               gcc_64_cflags="-g -O2 -m64 -mptr64 -Wa,-xarch=v9 -mcpu=v9"
               gcc_64_ldflags="-Wc,-m64"
               # -fast enables different optimizations depending compiler version
               # -fns=no and -fsimple=1 disables some transformations that
               # conflict with IEEE 754, which some compiler versions perform.
               cc_64_cflags="-fast -fns=no -fsimple=1 -xarch=v9"
               SPEED_CYCLECOUNTER_OBJ_64=sparcv9.lo
               cyclecounter_size_64=2
               ;;
             *-*-*bsd*)
               # NetBSD and OpenBSD sparc64
               abilist="64"
               extra_functions=
               path="sparc64"
               gcc_cflags="-g -O2"
               cyclecounter_size=2
               ;;
           esac
         ;;
       esac
     ;;      ;;
   supersparc*)  
     if [ x$with_gcc != xno ]  
     then    # VAX
       target_makefile_frag=config/mt-supspc-gcc    vax*-*-*)
       # Currently (version 3.0) gcc on vax always uses a frame pointer
       # (config/vax/vax.h FRAME_POINTER_REQUIRED=1), so -fomit-frame-pointer
       # will be ignored.
       #
       gcc_cflags="-g -O2 $fomit_frame_pointer"
       path="vax"
       extra_functions="udiv_w_sdiv"
       ;;
   
   
     # AMD and Intel x86 configurations
     X86_PATTERN)
       AC_DEFINE(HAVE_HOST_CPU_FAMILY_x86)
       # Rumour has it gcc -O2 used to give worse register allocation than just
       # -O, but lets assume that's no longer true.
       gcc_cflags="-g -O2 $fomit_frame_pointer"
       GMP_INCLUDE_MPN(x86/x86-defs.m4)
       extra_functions="udiv umul"
       CALLING_CONVENTIONS_OBJS='x86call.lo x86check$U.lo'
   
       # Availability of rdtsc is checked at run-time.
       SPEED_CYCLECOUNTER_OBJ=pentium.lo
   
       # gcc 2.7.2 only knows i386 and i486, using -m386 or -m486.  These
       # represent -mcpu= since -m486 doesn't generate 486 specific insns.  The
       # -mcpu= and -march= options will fail, leaving just -m486.
       #
       # gcc 2.95.2 adds k6, pentium and pentiumpro, and allows -march= and
       # -mcpu=.
       #
       # gcc 3.0 adds athlon.
       #
       # gcc 3.1 adds pentium4.
   
       # Defaults for anything not otherwise mentioned.
       path="x86"
       gcc_cflags_optlist="cpu arch"
       gcc_cflags_cpu="-mcpu=i486 -m486"
       gcc_cflags_arch="-march=i486"
   
       case $host in
         i386*-*-*)
           # Because i386 means generic x86, -mcpu=i486 is used since that
           # should better suit newer processors.
           # FIXME: How would a user ask for an actual 80386? Currently only by
           # using CFLAGS="-mcpu=386" or whatever.
           gcc_cflags_cpu="-mcpu=i486 -m486"
           gcc_cflags_arch="-march=i386"
           ;;
         i586*-*-* | pentium-*-* | pentiummmx-*-*)
           gcc_cflags_cpu="-mcpu=pentium -m486"
           gcc_cflags_arch="-march=pentium"
           ;;
         [i686*-*-* | pentiumpro-*-* | pentium[23]-*-*])
           gcc_cflags_cpu="-mcpu=pentiumpro -mcpu=i486 -m486"
           gcc_cflags_arch="-march=pentiumpro -march=pentium -march=i486"
           ;;
         k6*-*-*)
           gcc_cflags_cpu="-mcpu=k6 -mcpu=i486 -m486"
           gcc_cflags_arch="-march=k6 -march=i486"
           ;;
         athlon-*-*)
           # Athlon instruction costs are close to P6 (3 cycle load latency,
           # 4-6 cycle mul, 40 cycle div, pairable adc, etc) so if gcc doesn't
           # know athlon (eg. 2.95.2 doesn't) then fall back on pentiumpro.
           gcc_cflags_cpu="-mcpu=athlon -mcpu=pentiumpro -mcpu=i486 -m486"
           gcc_cflags_arch="-march=athlon -march=pentiumpro -march=pentium -march=i486"
           ;;
         pentium4-*-*)
           # pentium4 is known to gcc 3.1 and up, not sure what cpu choice
           # would best suit previous versions, pentiumpro will get us cmov
           # from gcc 2.95.4 up, otherwise let's just try i486.
           gcc_cflags_cpu="-mcpu=pentium4 -mcpu=pentiumpro -mcpu=i486 -m486"
           gcc_cflags_arch="-march=pentium4 -march=pentiumpro -march=pentium -march=i486"
           ;;
       esac
   
       case $host in
         i486*-*-*)                  path="x86/i486 x86" ;;
         i586*-*-* | pentium-*-*)    path="x86/pentium x86" ;;
         pentiummmx-*-*)             path="x86/pentium/mmx x86/pentium x86" ;;
         i686*-*-* | pentiumpro-*-*) path="x86/p6 x86" ;;
         pentium2-*-*)   path="x86/p6/mmx x86/p6 x86" ;;
         pentium3-*-*)   path="x86/p6/p3mmx x86/p6/mmx x86/p6 x86";;
         [k6[23]*-*-*])  path="x86/k6/k62mmx x86/k6/mmx x86/k6 x86" ;;
         k6*-*-*)        path="x86/k6/mmx x86/k6 x86" ;;
         athlon-*-*)     path="x86/k7/mmx x86/k7 x86" ;;
         pentium4-*-*)   path="x86/pentium4/sse2 x86/pentium4/mmx x86/pentium4 x86" ;;
       esac
       ;;
   
   
     # FIXME: z8kx won't get through config.sub.  Could make 16 versus 32 bit
     # limb an ABI option perhaps.
     z8kx*-*-*)
       path="z8000x"
       extra_functions="udiv_w_sdiv"
       ;;
     z8k*-*-*)
       path="z8000"
       extra_functions="udiv_w_sdiv"
       ;;
   
   
     # Special CPU "none" selects generic C.  -DNO_ASM is used to disable gcc
     # asm blocks in longlong.h (since they're driven by cpp pre-defined
     # symbols like __alpha rather than the configured $host_cpu).
     #
     none-*-*)
       abilist="long longlong"
       cclist_long=$cclist
       gcc_long_cflags=$gcc_cflags
       gcc_long_cppflags="-DNO_ASM"
       cc_long_cflags=$cc_cflags
       cclist_longlong=$cclist
       gcc_longlong_cflags=$gcc_cflags
       gcc_longlong_cppflags="-DNO_ASM"
       cc_longlong_cflags=$cc_cflags
       limb_longlong=longlong
       ;;
   
   esac
   
   
   CFLAGS_or_unset=${CFLAGS-'(unset)'}
   CPPFLAGS_or_unset=${CPPFLAGS-'(unset)'}
   
   cat >&AC_FD_CC <<EOF
   configure:__line__: User:
   ABI=$ABI
   CC=$CC
   CFLAGS=$CFLAGS_or_unset
   CPPFLAGS=$CPPFLAGS_or_unset
   MPN_PATH=$MPN_PATH
   configure:__line__: GMP:
   abilist=$abilist
   cclist=$cclist
   EOF
   
   
   test_CFLAGS=${CFLAGS+set}
   test_CPPFLAGS=${CPPFLAGS+set}
   
   for abi in $abilist; do
     abi_last="$abi"
   done
   
   # If the user specifies an ABI then it must be in $abilist, after that
   # $abilist is restricted to just that choice.
   #
   if test -n "$ABI"; then
     found=no
     for abi in $abilist; do
       if test $abi = "$ABI"; then found=yes; break; fi
     done
     if test $found = no; then
       AC_MSG_ERROR([ABI=$ABI is not among the following valid choices: $abilist])
     fi
     abilist="$ABI"
   fi
   
   found_compiler=no
   
   for abi in $abilist; do
   
     # Suppose abilist="64 32", then for abi=64, will have abi1="_64" and
     # abi2="_64".  For abi=32, will have abi1="_32" and abi2="".  This is how
     # $gcc_cflags becomes a fallback for $gcc_32_cflags (the last in the
     # abilist), but there's no fallback for $gcc_64_cflags.
     #
     abi1=[`echo _$abi | sed 's/[.]//g'`]
     if test $abi = $abi_last; then abi2=; else abi2="$abi1"; fi
   
     # Compiler choices under this ABI
                                 eval cclist_chosen=\"\$cclist$abi1\"
     test -n "$cclist_chosen" || eval cclist_chosen=\"\$cclist$abi2\"
   
     # If there's a user specified $CC then don't use a list for
     # $cclist_chosen, just a single value for $ccbase.
     #
     if test -n "$CC"; then
   
       # The first word of $CC, stripped of any directory.  For instance
       # CC="/usr/local/bin/gcc -pipe" will give "gcc".
       #
       for ccbase in $CC; do break; done
       ccbase=`echo $ccbase | sed 's:.*/::'`
   
       # If this $ccbase is in $cclist_chosen then it's a compiler we know and
       # we can do flags defaulting with it.  If not, then $cclist_chosen is
       # set to "unrecognised" so no default flags are used.
       #
       # "unrecognised" is used to avoid bad effects with eval if $ccbase has
       # non-symbol characters.  For instance ccbase=my+cc would end up with
       # something like cflags="$my+cc_cflags" which would give
       # cflags="+cc_cflags" rather than the intended empty string for an
       # unknown compiler.
       #
       found=unrecognised
       for i in $cclist_chosen; do
         if test "$ccbase" = $i; then
           found=$ccbase
           break
         fi
       done
       cclist_chosen=$found
     fi
   
     for ccbase in $cclist_chosen; do
   
       # When cross compiling, look for a compiler with the $host_alias as a
       # prefix, the same way that AC_CHECK_TOOL does.  But don't do this to a
       # user-selected $CC.
       #
       # $cross_compiling will be yes/no/maybe at this point.  Do the host
       # prefixing for "maybe" as well as "yes".
       #
       if test "$cross_compiling" != no && test -z "$CC"; then
         cross_compiling_prefix="${host_alias}-"
     fi      fi
   
       for ccprefix in $cross_compiling_prefix ""; do
   
         cc="$CC"
         test -n "$cc" || cc="$ccprefix$ccbase"
   
         # If the compiler is gcc but installed under another name, then change
         # $ccbase so as to use the flags we know for gcc.  This helps for
         # instance when specifying CC=gcc272 on Debian GNU/Linux, or the
         # native cc which is really gcc on NeXT or MacOS-X.
         #
         # FIXME: There's a slight misfeature here.  If cc is actually gcc but
         # gcc is not a known compiler under this $abi then we'll end up
         # testing it with no flags and it'll work, but chances are it won't be
         # in the right mode for the ABI we desire.  Let's quietly hope this
         # doesn't happen.
         #
         if test $ccbase != gcc; then
           GMP_PROG_CC_IS_GNU($cc,ccbase=gcc)
         fi
   
         # Similarly if the compiler is IBM xlc but invoked as cc or whatever
         # then change $ccbase and make the default xlc flags available.
         if test $ccbase != xlc; then
           GMP_PROG_CC_IS_XLC($cc,ccbase=xlc)
         fi
   
         # Any user CFLAGS, even an empty string, takes precendence
                              eval cflags=\"\$${ccbase}${abi1}_cflags\"
         test -n "$cflags" || eval cflags=\"\$${ccbase}${abi2}_cflags\"
         if test "$test_CFLAGS" = set; then cflags=$CFLAGS; fi
   
         # Any user CPPFLAGS, even an empty string, takes precendence
                                eval cppflags=\"\$${ccbase}${abi1}_cppflags\"
         test -n "$cppflags" || eval cppflags=\"\$${ccbase}${abi2}_cppflags\"
         if test "$test_CPPFLAGS" = set; then cppflags=$CPPFLAGS; fi
   
         # --enable-profiling adds -p/-pg even to user-specified CFLAGS.
         # This is convenient, but it's perhaps a bit naughty to modify user
         # CFLAGS.
         case "$enable_profiling" in
         prof)  cflags="$cflags -p" ;;
         gprof) cflags="$cflags -pg" ;;
         esac
   
         GMP_PROG_CC_WORKS($cc $cflags $cppflags,,continue)
   
         # The tests to perform on this $cc, if any
                                eval testlist=\"\$${ccbase}${abi1}_testlist\"
         test -n "$testlist" || eval testlist=\"\$${ccbase}${abi2}_testlist\"
   
         testlist_pass=yes
         for tst in $testlist; do
           case $tst in
           hpc-hppa-2-0)   GMP_HPC_HPPA_2_0($cc,,testlist_pass=no) ;;
           gcc-arm-umodsi) GMP_GCC_ARM_UMODSI($cc,,testlist_pass=no) ;;
           gcc-mips-o32)   GMP_GCC_MIPS_O32($cc,,testlist_pass=no) ;;
           esac
           if test $testlist_pass = no; then break; fi
         done
   
         if test $testlist_pass = yes; then
           found_compiler=yes
           break
         fi
       done
   
       if test $found_compiler = yes; then break; fi
     done
   
     if test $found_compiler = yes; then break; fi
   done
   
   
   # If we recognised the CPU, as indicated by $path being set, then insist
   # that we have a working compiler, either from our $cclist choices or from
   # $CC.  We can't let AC_PROG_CC look around for a compiler because it might
   # find one that we've rejected (for not supporting the modes our asm code
   # demands, etc).
   #
   # If we didn't recognise the CPU (and this includes host_cpu=none), then
   # fall through and let AC_PROG_CC look around for a compiler too.  This is
   # mostly in the interests of following a standard autoconf setup, after all
   # we've already tested cc and gcc adequately (hopefully).  As of autoconf
   # 2.50 the only thing AC_PROG_CC really adds is a check for "cl" (Microsoft
   # C on MS-DOS systems).
   #
   if test $found_compiler = no && test -n "$path"; then
     AC_MSG_ERROR([could not find a working compiler])
   fi
   
   
   if test $found_compiler = yes; then
   
     # If we're creating CFLAGS, then look for optional additions.  If the user
     # set CFLAGS then leave it alone.
     #
     if test "$test_CFLAGS" != set; then
                             eval optlist=\"\$${ccbase}${abi1}_cflags_optlist\"
       test -n "$optlist" || eval optlist=\"\$${ccbase}${abi2}_cflags_optlist\"
   
       for opt in $optlist; do
                                eval optflags=\"\$${ccbase}${abi1}_cflags_${opt}\"
         test -n "$optflags" || eval optflags=\"\$${ccbase}${abi2}_cflags_${opt}\"
         test -n "$optflags" || eval optflags=\"\$${ccbase}_cflags_${opt}\"
   
         for flag in $optflags; do
   
           # ~ respresents a space in an option spec
           flag=`echo "$flag" | tr '~' ' '`
   
           case $flag in
             -O*)
               # ease back to just -O on m68k gcc 2.95.x
               GMP_GCC_M68K_OPTIMIZE($ccbase,$cc,flag)
               ;;
             -no-cpp-precomp)
               # special check, avoiding a warning
               GMP_GCC_NO_CPP_PRECOMP($ccbase,$cc,$cflags,
                                      [cflags="$cflags $flag"
                                      break],
                                      [continue])
               ;;
             -Wa,-m*)
               case $host in
                 alpha*-*-*)
                   GMP_GCC_WA_MCPU($cc $cflags, $flag, , [continue])
                 ;;
               esac
               ;;
           esac
   
           GMP_PROG_CC_WORKS($cc $cflags $cppflags $flag,
             [cflags="$cflags $flag"
             break])
         done
       done
     fi
   
     ABI="$abi"
     CC="$cc"
     CFLAGS="$cflags"
     CPPFLAGS="$cppflags"
   
   
     # Could easily have this in config.h too, if desired.
     ABI_nodots=`echo $ABI | sed 's/\./_/'`
     GMP_DEFINE_RAW("define_not_for_expansion(\`HAVE_ABI_$ABI_nodots')", POST)
   
   
     # GMP_LDFLAGS substitution, selected according to ABI.
     # These are needed on libgmp.la and libmp.la, but currently not on
     # convenience libraries like tune/libspeed.la or mpz/libmpz.la.
     #
                               eval GMP_LDFLAGS=\"\$${ccbase}${abi1}_ldflags\"
     test -n "$GMP_LDFLAGS" || eval GMP_LDFLAGS=\"\$${ccbase}${abi1}_ldflags\"
     AC_SUBST(GMP_LDFLAGS)
   
     # extra_functions, selected according to ABI
                       eval tmp=\"\$extra_functions$abi1\"
     test -n "$tmp" || eval tmp=\"\$extra_functions$abi2\"
     extra_functions="$tmp"
   
   
     # Cycle counter, selected according to ABI.
     #
                       eval tmp=\"\$SPEED_CYCLECOUNTER_OBJ$abi1\"
     test -n "$tmp" || eval tmp=\"\$SPEED_CYCLECOUNTER_OBJ$abi2\"
     SPEED_CYCLECOUNTER_OBJ="$tmp"
                       eval tmp=\"\$cyclecounter_size$abi1\"
     test -n "$tmp" || eval tmp=\"\$cyclecounter_size$abi2\"
     cyclecounter_size="$tmp"
   
     if test -n "$SPEED_CYCLECOUNTER_OBJ"; then
       AC_DEFINE_UNQUOTED(HAVE_SPEED_CYCLECOUNTER, $cyclecounter_size,
       [Tune directory speed_cyclecounter, undef=none, 1=32bits, 2=64bits)])
     fi
     AC_SUBST(SPEED_CYCLECOUNTER_OBJ)
   
   
     # Calling conventions checking, selected according to ABI.
     #
                       eval tmp=\"\$CALLING_CONVENTIONS_OBJS$abi1\"
     test -n "$tmp" || eval tmp=\"\$CALLING_CONVENTIONS_OBJS$abi2\"
     CALLING_CONVENTIONS_OBJS="$tmp"
   
     if test -n "$CALLING_CONVENTIONS_OBJS"; then
       AC_DEFINE(HAVE_CALLING_CONVENTIONS,1,
       [Define if tests/libtests has calling conventions checking for the CPU])
     fi
     AC_SUBST(CALLING_CONVENTIONS_OBJS)
   
   fi
   
   
   # If the user gave an MPN_PATH, use that verbatim, otherwise choose
   # according to the ABI and add "generic".
   #
   if test -n "$MPN_PATH"; then
     path="$MPN_PATH"
   else
                       eval tmp=\"\$path$abi1\"
     test -n "$tmp" || eval tmp=\"\$path$abi2\"
     path="$tmp generic"
   fi
   
   
   # Whether using a long long limb in this ABI.
                             eval limb_chosen=\"\$limb$abi1\"
   test -n "$limb_chosen" || eval limb_chosen=\"\$limb$abi2\"
   case $limb_chosen in
   longlong) DEFN_LONG_LONG_LIMB="#define _LONG_LONG_LIMB 1"    ;;
   *)        DEFN_LONG_LONG_LIMB="/* #undef _LONG_LONG_LIMB */" ;;
   esac
   AC_SUBST(DEFN_LONG_LONG_LIMB)
   
   
   # The C compiler and preprocessor, put into ANSI mode if possible.
   AC_PROG_CC
   AC_PROG_CC_STDC
   AC_PROG_CPP
   GMP_H_ANSI
   
   
   # The C++ compiler, if desired.
   want_cxx=no
   if test $enable_cxx != no; then
     test_CXXFLAGS=${CXXFLAGS+set}
     AC_PROG_CXX
   
     echo "CXXFLAGS chosen by autoconf: $CXXFLAGS" >&AC_FD_CC
     cxxflags_ac_prog_cxx=$CXXFLAGS
     cxxflags_list=ac_prog_cxx
   
     # If the user didn't specify $CXXFLAGS, then try $CFLAGS, with -g removed
     # if AC_PROG_CXX thinks that doesn't work.  $CFLAGS stands a good chance
     # of working, eg. on a GNU system where CC=gcc and CXX=g++.
     #
     if test "$test_CXXFLAGS" != set; then
       cxxflags_cflags=$CFLAGS
       cxxflags_list="cflags $cxxflags_list"
       if test "$ac_prog_cxx_g" = no; then
         cxxflags_cflags=`echo "$cxxflags_cflags" | sed -e 's/ -g //' -e 's/^-g //' -e 's/ -g$//'`
       fi
     fi
   
     # See if the C++ compiler works.  If the user specified CXXFLAGS then all
     # we're doing is checking whether AC_PROG_CXX succeeded, since it doesn't
     # give a fatal error, just leaves CXX set to a default g++.  If on the
     # other hand the user didn't specify CXXFLAGS then we get to try here our
     # $cxxflags_list alternatives.
     #
     for cxxflags_choice in $cxxflags_list; do
       eval CXXFLAGS=\"\$cxxflags_$cxxflags_choice\"
       GMP_PROG_CXX_WORKS($CXX $CXXFLAGS,
         [want_cxx=yes
         break])
     done
   
     # If --enable-cxx=yes but a C++ compiler can't be found, then abort.
     if test $want_cxx = no && test $enable_cxx = yes; then
       AC_MSG_ERROR([C++ compiler not available])
     fi
   fi
   
   AM_CONDITIONAL(WANT_CXX, test $want_cxx = yes)
   
   # FIXME: We're not interested in CXXCPP for ourselves, but if we don't call
   # it here then AC_PROG_LIBTOOL (via _LT_AC_TAGCONFIG) will do so
   # unconditionally, and that will fail if there's no C++ compiler (and no
   # generic /lib/cpp).
   #
   if test $want_cxx = yes; then
     AC_PROG_CXXCPP
   fi
   
   case $host_cpu in
     c90 | t90)
       AC_EGREP_CPP(yes,
   [#ifdef _CRAYIEEE
   yes
   #endif],
       [add_path="cray/ieee"],
       [add_path="cray/cfp"; extra_functions="mulwwc90"]) ;;
     j90 | sv1)
       extra_functions="mulwwj90"
       add_path="cray/cfp" ;;
   esac
   
   if test -z "$MPN_PATH"; then
     path="$add_path $path"
   fi
   
   # for a nail build, also look in "nails" subdirectories
   if test $GMP_NAIL_BITS != 0 && test -z "$MPN_PATH"; then
     new_path=
     for i in $path; do
       case $i in
       generic) new_path="$new_path $i" ;;
       *)       new_path="$new_path $i/nails $i" ;;
       esac
     done
     path=$new_path
   fi
   
   
   cat >&AC_FD_CC <<EOF
   configure:__line__: Decided:
   ABI=$ABI
   CC=$CC
   CFLAGS=$CFLAGS
   CPPFLAGS=$CPPFLAGS
   GMP_LDFLAGS=$GMP_LDFLAGS
   CXX=$CXX
   CXXFLAGS=$CXXFLAGS
   path=$path
   EOF
   echo "using ABI=\"$ABI\""
   echo "      CC=\"$CC\""
   echo "      CFLAGS=\"$CFLAGS\""
   echo "      CPPFLAGS=\"$CPPFLAGS\""
   if test $want_cxx = yes; then
     echo "      CXX=\"$CXX\""
     echo "      CXXFLAGS=\"$CXXFLAGS\""
   fi
   echo "      MPN_PATH=\"$path\""
   
   
   # Automake ansi2knr support.
   AM_C_PROTOTYPES
   
   GMP_PROG_AR
   GMP_PROG_NM
   
   case $host in
     # FIXME: On AIX 3 and 4, $libname.a is included in libtool
     # $library_names_spec, so libgmp.a becomes a symlink to libgmp.so, making
     # it impossible to build shared and static libraries simultaneously.
     # Disable shared libraries by default, but let the user override with
     # --enable-shared --disable-static.
     #
     # FIXME: This $libname.a problem looks like it might apply to *-*-amigaos*
     # and *-*-os2* too, but wait for someone to test this before worrying
     # about it.  If there is a problem then of course libtool is the right
     # place to fix it.
     #
     [*-*-aix[34]*])
       if test -z "$enable_shared"; then enable_shared=no; fi ;;
   
     # FIXME: Libtool recognises djgpp can't build shared libraries, but still
     # makes tests/.libs/libtests.al out of PIC objects, which then fail to
     # link into the test programs.  Forcibly disable shared stuff until
     # libtool gets it right,
     #
     *-*-msdosdjgpp*)
       enable_shared=no ;;
   
     # FIXME: On SCO 5, an explicit -lc is not wanted when making shared
     # libraries.  Giving it makes strange things happen, like ctype.h macros
     # not working and profiler mcount calls segfaulting.  Libtool ought to
     # know about this, but as of Dec 2000 it doesn't, so forcibly disable -lc
     # on relevant systems.
     #
     *-*-sco3.2v5*)
       lt_cv_archive_cmds_need_lc=no ;;
   
     # FIXME: Shared libraries aren't supported on unicos, but as of Dec 2000
     # libtool doesn't seem to detect this correctly, so forcibly disable them.
     #
     *-*-unicos*)
       enable_shared=no ;;
   
     # It seems there are no shared libs on ultrix, and it is not very important
     # to work on this.  Just disable for now.
     *-*-ultrix*)
       enable_shared=no ;;
   esac
   
   # FIXME: AC_LIBTOOL_SYS_MAX_CMD_LEN has been reported to blow up in some
   # fashion on windows 9x (but not 2k), taking a very long time and
   # temporarily locking the whole PC.  Clearly this is a libtool problem, but
   # for now force a sensible value to avoid the test.
   #
   case $build in
     *-*-cygwin*)
       if test -z "$lt_cv_sys_max_cmd_len"; then
         lt_cv_sys_max_cmd_len=20000
       fi
     ;;      ;;
   m888110*)  esac
     if [ x$with_gcc != xno ]  
     then  
       target_makefile_frag=config/mt-m88110  # Configs for Windows DLLs.
   
   AC_LIBTOOL_WIN32_DLL
   
   AC_SUBST(LIBGMP_DLL,0)
   case $host in
     *-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-os2*)
       # By default, build only static.
       if test -z "$enable_shared"; then
         enable_shared=no
     fi      fi
       # Don't allow both static and DLL.
       if test "$enable_shared" != no && test "$enable_static" != no; then
         AC_MSG_ERROR([cannot build both static and DLL, since gmp.h is different for each.
   Use "--disable-static --enable-shared" to build just a DLL.])
       fi
       if test "$enable_shared" = yes; then
         # libtool requires "-no-undefined", see AC_LIBTOOL_WIN32_DLL doco.
         GMP_LDFLAGS="$GMP_LDFLAGS -no-undefined"
         LIBGMP_DLL=1
       fi
     ;;      ;;
   *-*-linux*)  
     target_makefile_frag=config/mt-linux ;;  
   
 esac  esac
   
   # When cross compiling a DLL, libtool requires $HOST_CC, to compile impgen.c
   # on the build system.  It's a well-known misfeature that libtool doesn't
   # hunt around for a useful HOST_CC on its own.
   # FIXME: Newer libtool looks like it'll need this only for "*-*-mingw* |
   # *-*-pw32*", not *-*-cygwin*.
   #
   case $host in
     *-*-cygwin* | *-*-mingw* | *-*-pw32*)
       if test "$cross_compiling" != no && test "$enable_shared" != no; then
         GMP_PROG_HOST_CC
       fi
       ;;
   esac
   
   
   # Ensure that $CONFIG_SHELL is available for AC_LIBTOOL_SYS_MAX_CMD_LEN.
   # It's often set already by _LT_AC_PROG_ECHO_BACKSLASH or
   # _AS_LINENO_PREPARE, but not always.
   #
   # The symptom of CONFIG_SHELL unset is some "expr" errors during the test,
   # and an empty result.  This only happens when invoked as "sh configure",
   # ie. no path, and can be seen for instance on ia64-*-hpux*.
   #
   # FIXME: Newer libtool should have it's own fix for this.
   #
   if test -z "$CONFIG_SHELL"; then
     CONFIG_SHELL=$SHELL
   fi
   
   # Enable CXX in libtool only if we want it, and never enable GCJ, nor RC on
   # mingw and cygwin.  Under --disable-cxx this avoids some error messages
   # from libtool arising from the fact we didn't actually run AC_PROG_CXX.
   # Notice that any user-supplied --with-tags setting takes precedence.
   #
   # FIXME: Is this the right way to get this effect?  Very possibly not, but
   # the current _LT_AC_TAGCONFIG doesn't really suggest an alternative.
   #
   if test "${with_tags+set}" != set; then
     if test $want_cxx = yes; then
       with_tags=CXX
     else
       with_tags=
     fi
   fi
   
   AC_PROG_LIBTOOL
   
   # Generate an error here if attempting to build both shared and static when
   # $libname.a is in $library_names_spec (as mentioned above), rather than
   # wait for ar or ld to fail.
   #
   if test "$enable_shared" = yes && test "$enable_static" = yes; then
     case $library_names_spec in
       *libname.a*)
         AC_MSG_ERROR([cannot create both shared and static libraries on this system, --disable one of the two])
         ;;
     esac
   fi
   
   
   # How to assemble, used with CFLAGS etc, see mpn/Makeasm.am.
   # Using the compiler is a lot easier than figuring out how to invoke the
   # assembler directly.
   #
   test -n "$CCAS" || CCAS="$CC -c"
   AC_SUBST(CCAS)
   
   case $host in
     X86_PATTERN)
       # If there's any sse2 or mmx in the path, check whether the assembler
       # supports it, and remove if not.
       case "$path" in
         *mmx*)   GMP_ASM_X86_MMX( , [GMP_STRIP_PATH(*mmx*)]) ;;
       esac
       case "$path" in
         *sse2*)  GMP_ASM_X86_SSE2( , [GMP_STRIP_PATH(sse2)]) ;;
       esac
     ;;
   esac
   
   
   # The library and header checks are mostly for the benefit of supplementary
   # programs.  libgmp doesn't use anything too weird.
   
   AC_HEADER_STDC
   AC_HEADER_TIME
   
   # Reasons for testing:
   #   sys/param.h - not in mingw
   #   sys/processor.h - solaris specific, though also present in macos
   #   sys/resource.h - not in mingw
   #   sys/sysctl.h - not in mingw
   #   sys/syssgi.h - IRIX specific
   #   sys/systemcfg.h - AIX specific
   #   sys/times.h - not in mingw
   #
   # inttypes.h, stdint.h, unistd.h and sys/types.h are already in the autoconf
   # default tests
   #
   AC_CHECK_HEADERS(fcntl.h locale.h sys/mman.h sys/param.h sys/processor.h sys/resource.h sys/sysctl.h sys/syssgi.h sys/systemcfg.h sys/time.h sys/times.h)
   
   # optarg should be in unistd.h, which is already in the default includes
   AC_CHECK_DECLS([fgetc, fscanf, optarg, ungetc, vfprintf])
   
   AC_TYPE_SIGNAL
   
   # the default includes are sufficient for all these types
   AC_CHECK_TYPES([intmax_t, long double, long long, ptrdiff_t, quad_t])
   
   AC_C_STRINGIZE
   AC_C_VOLATILE
   GMP_C_STDARG
   GMP_C_ATTRIBUTE_CONST
   GMP_C_ATTRIBUTE_MALLOC
   GMP_C_ATTRIBUTE_MODE
   GMP_C_ATTRIBUTE_NORETURN
   
   GMP_C_INLINE
   GMP_H_EXTERN_INLINE
   
   # from libtool
   AC_CHECK_LIBM
   AC_SUBST(LIBM)
   
   GMP_FUNC_ALLOCA
   GMP_OPTION_ALLOCA
   
   GMP_H_HAVE_FILE
   GMP_IMPL_H_IEEE_FLOATS
   
   # FIXME: Autoconf 2.52 AC_C_BIGENDIAN bombs when cross compiling, but in the
   # future the probes will be better and this override can be removed.
   if test "$cross_compiling" = yes; then
     ac_cv_c_bigendian=unknown
   fi
   AC_C_BIGENDIAN
   # Enhancement: In the future AC_C_BIGENDIAN will accept these actions as
   # parameters.
   case $ac_cv_c_bigendian in
     yes)     AC_DEFINE(HAVE_LIMB_BIG_ENDIAN, 1) ;;
     no)      AC_DEFINE(HAVE_LIMB_LITTLE_ENDIAN, 1) ;;
     unknown) ;;
     *)       AC_MSG_ERROR([Oops, unrecognised ac_cv_c_bigendian]) ;;
   esac
   AH_VERBATIM([HAVE_LIMB],
   [/* Define one (just one) of the following for the endiannes of `mp_limb_t'.
      If the endianness is not a simple big or little, or you don't know what
      it is, then leave both of these undefined. */
   #undef HAVE_LIMB_BIG_ENDIAN
   #undef HAVE_LIMB_LITTLE_ENDIAN])
   
   GMP_C_DOUBLE_FORMAT
   
   
   # On m68k NetBSD 1.4.1 getrusage() is doubtful.  ru_utime looks microsecond
   # accurate but has been seen remaining unchanged after many microseconds
   # have elapsed.  This upsets the tune and speed programs, so pretend it
   # doesn't exist.
   #
   # FIXME: Would prefer tune/time.c to do a run-time test for this rather than
   # driving it from the system name.
   #
   case $host in
     m68*-*-netbsd1.4*) ac_cv_func_getrusage=no ;;
   esac
   
   # Reasons for testing:
   #   alarm - not in mingw
   #   clock_gettime - not in glibc 2.2.4, only very recent systems
   #   cputime - not in glibc
   #   gettimeofday - not in mingw
   #   mmap - not in mingw, djgpp
   #   obstack_vprintf - glibc specific
   #   processor_info - solaris specific
   #   read_real_time - AIX specific
   #   sigaction - not in mingw
   #   sigaltstack - not in mingw, old AIX (reputedly)
   #   sigstack - not in mingw
   #   strnlen - glibc extension
   #   syssgi - IRIX specific
   #   times - not in mingw
   #
   # clock_gettime is in librt on *-*-osf5.1.  We could look for it
   # there, but that's not worth bothering with unless it has a decent
   # resolution (in a quick test clock_getres said only 1 millisecond).
   #
   AC_CHECK_FUNCS(alarm clock clock_gettime cputime getpagesize getrusage gettimeofday localeconv memset mmap mprotect obstack_vprintf popen processor_info read_real_time sigaction sigaltstack sigstack syssgi strchr strnlen strtoul sysconf sysctl sysctlbyname times)
   
   # FIXME: Would have done this with an AM_CONDITIONAL, but automake 1.5
   # doesn't like that under libgmp_la_DEPENDENCIES.
   GMP_FUNC_VSNPRINTF
   if test "$gmp_cv_func_vsnprintf" = no; then
     AC_SUBST(REPL_VSNPRINTF_PRINTF_OBJ, 'printf/repl-vsnprintf$U.lo')
     AC_SUBST(REPL_VSNPRINTF_OBJ,        'repl-vsnprintf$U.lo')
   fi
   
   GMP_FUNC_SSCANF_WRITABLE_INPUT
   
   
   # Pick the correct source files in $path and link them to mpn/.
   # $gmp_mpn_functions lists all functions we need.
   #
   # The rule is to find a file with the function name and a .asm, .S,
   # .s, or .c extension.  Certain multi-function files with special names
   # can provide some functions too.  (mpn/Makefile.am passes
   # -DOPERATION_<func> to get them to generate the right code.)
   
   # FIXME: udiv and umul aren't in $gmp_mpn_functions_optional yet since
   # there's some versions of those files which should be checked for bit
   # rot first.  Put them in $extra_functions for each host for now,
   # change to standard optionals when all are ready.
   
   # Note: The following lines defining $gmp_mpn_functions_optional
   #       and $gmp_mpn_functions are parsed by the "macos/configure"
   #       Perl script. So if you change the lines in a major way
   #       make sure to run and examine the output from
   #
   #           % (cd macos; perl configure)
   #
   # Note: $gmp_mpn_functions must have mod_1 before pre_mod_1 so the former
   #       can optionally provide the latter as an extra entrypoint.  Likewise
   #       divrem_1 and pre_divrem_1.
   
   gmp_mpn_functions_optional="copyi copyd com_n
     and_n andn_n nand_n ior_n iorn_n nior_n xor_n xnor_n                  \
     gcd_finda invert_limb sqr_diagonal                                    \
     mul_2 mul_3 mul_4 addmul_2 addmul_3 addmul_4"
   
   gmp_mpn_functions="$extra_functions                                        \
     add add_1 add_n sub sub_1 sub_n mul_1 addmul_1                           \
     submul_1 lshift rshift dive_1 diveby3 divis divrem divrem_1 divrem_2     \
     fib2_ui mod_1 mod_34lsub1 mode1o pre_divrem_1 pre_mod_1 dump             \
     mul mul_fft mul_n mul_basecase sqr_basecase random random2 pow_1         \
     rootrem sqrtrem get_str set_str scan0 scan1 popcount hamdist cmp perfsqr \
     bdivmod gcd_1 gcd gcdext tdiv_qr dc_divrem_n sb_divrem_mn jacbase        \
     $gmp_mpn_functions_optional"
   
   # the list of all object files used by mpn/Makefile.in and the
   # top-level Makefile.in, respectively
   mpn_objects=
   mpn_objs_in_libgmp="mpn/mp_bases.lo"
   
   # links from the sources, to be removed by "make distclean"
   gmp_srclinks=
   
   define(MPN_SUFFIXES,[asm S s c])
   
   for tmp_ext in MPN_SUFFIXES; do
     eval found_$tmp_ext=no
   done
   
   for tmp_fn in $gmp_mpn_functions; do
     for tmp_ext in MPN_SUFFIXES; do
       test "$no_create" = yes || rm -f mpn/$tmp_fn.$tmp_ext
     done
   
     # mpn_preinv_divrem_1 might have been provided by divrem_1.asm, likewise
     # mpn_preinv_mod_1 by mod_1.asm.
     case $tmp_fn in
     pre_divrem_1)
       if test "$HAVE_NATIVE_mpn_preinv_divrem_1" = yes; then continue; fi ;;
     pre_mod_1)
       if test "$HAVE_NATIVE_mpn_preinv_mod_1" = yes; then continue; fi ;;
     esac
   
     # functions that can be provided by multi-function files
     tmp_mulfunc=
     case $tmp_fn in
     add_n|sub_n)       tmp_mulfunc="aors_n"    ;;
     addmul_1|submul_1) tmp_mulfunc="aorsmul_1" ;;
     popcount|hamdist)  tmp_mulfunc="popham"    ;;
     and_n|andn_n|nand_n | ior_n|iorn_n|nior_n | xor_n|xnor_n)
                        tmp_mulfunc="logops_n"  ;;
     lshift|rshift)     tmp_mulfunc="lorrshift";;
     esac
   
     found=no
     for tmp_dir in $path; do
       for tmp_base in $tmp_fn $tmp_mulfunc; do
         for tmp_ext in MPN_SUFFIXES; do
           tmp_file=$srcdir/mpn/$tmp_dir/$tmp_base.$tmp_ext
           if test -f $tmp_file; then
   
             # For a nails build, check if the file supports our nail bits.
             # Generic code always supports all nails.
             #
             # FIXME: When a multi-function file is selected to provide one of
             # the nails-neutral routines, like logops_n for and_n, the
             # PROLOGUE grepping will create HAVE_NATIVE_mpn_<foo> defines for
             # all functions in that file, even if they haven't all been
             # nailified.  Not sure what to do about this, it's only really a
             # problem for logops_n, and it's not too terrible to insist those
             # get nailified alwasy.
             #
             if test $GMP_NAIL_BITS != 0 && test $tmp_dir != generic; then
               case $tmp_fn in
                 and_n | ior_n | xor_n | \
                 copyi | copyd | \
                 popcount | hamdist | \
                 udiv | udiv_qrnnd | udiv_w_sdiv | udiv_fp | udiv_nfp | \
                 umul | umul_ppmm | \
                 cntlz | invert_limb)
                   # these operations are either unaffected by nails or defined
                   # to operate on full limbs
                   ;;
                 *)
                   nails=[`sed -n 's/^[    ]*NAILS_SUPPORT(\(.*\))/\1/p' $tmp_file `]
                   for n in $nails; do
                     case $n in
                     *-*)
                       n_start=`echo "$n" | sed -n 's/\(.*\)-.*/\1/p'`
                       n_end=`echo "$n" | sed -n 's/.*-\(.*\)/\1/p'`
                       ;;
                     *)
                       n_start=$n
                       n_end=$n
                       ;;
                     esac
                     if test $GMP_NAIL_BITS -ge $n_start && test $GMP_NAIL_BITS -le $n_end; then
                       found=yes
                       break
                     fi
                   done
                   if test $found != yes; then
                     continue
                   fi
                   ;;
               esac
             fi
   
             found=yes
             eval found_$tmp_ext=yes
   
             if test $tmp_ext = c; then
               tmp_u='$U'
             else
               tmp_u=
             fi
   
             mpn_objects="$mpn_objects $tmp_fn$tmp_u.lo"
             mpn_objs_in_libgmp="$mpn_objs_in_libgmp mpn/$tmp_fn$tmp_u.lo"
             AC_CONFIG_LINKS(mpn/$tmp_fn.$tmp_ext:mpn/$tmp_dir/$tmp_base.$tmp_ext)
             gmp_srclinks="$gmp_srclinks mpn/$tmp_fn.$tmp_ext"
   
             # Duplicate AC_DEFINEs are harmless, so it doesn't matter
             # that multi-function files get grepped here repeatedly.
             # The PROLOGUE pattern excludes the optional second parameter.
             gmp_ep=[`
               sed -n 's/^[        ]*MULFUNC_PROLOGUE(\(.*\))/\1/p' $tmp_file ;
               sed -n 's/^[        ]*PROLOGUE(\([^,]*\).*)/\1/p' $tmp_file
             `]
             for gmp_tmp in $gmp_ep; do
               AC_DEFINE_UNQUOTED(HAVE_NATIVE_$gmp_tmp)
               eval HAVE_NATIVE_$gmp_tmp=yes
             done
   
             case $tmp_fn in
             sqr_basecase) sqr_basecase_source=$tmp_file ;;
             esac
   
             break
           fi
         done
         if test $found = yes; then break ; fi
       done
       if test $found = yes; then break ; fi
     done
   
     if test $found = no; then
       for tmp_optional in $gmp_mpn_functions_optional; do
         if test $tmp_optional = $tmp_fn; then
           found=yes
         fi
       done
       if test $found = no; then
         AC_MSG_ERROR([no version of $tmp_fn found in path: $path])
       fi
     fi
   done
   
   # All cycle counters are .asm files currently
   if test -n "$SPEED_CYCLECOUNTER_OBJ"; then
     found_asm=yes
   fi
   
   
   # Don't demand an m4 unless it's actually needed.
   if test $found_asm = yes; then
     GMP_PROG_M4
     GMP_M4_M4WRAP_SPURIOUS
   else
     M4=m4-not-needed
   fi
   
   # Only do the GMP_ASM checks if there's a .S or .asm wanting them.
   if test $found_asm = no && test $found_S = no; then
     gmp_asm_syntax_testing=no
   fi
   
   if test "$gmp_asm_syntax_testing" != no; then
     GMP_ASM_TEXT
     GMP_ASM_DATA
     GMP_ASM_LABEL_SUFFIX
     GMP_ASM_GLOBL
     GMP_ASM_UNDERSCORE
     GMP_ASM_RODATA
     GMP_ASM_GLOBL_ATTR
     GMP_ASM_TYPE
     GMP_ASM_SIZE
     GMP_ASM_LSYM_PREFIX
     GMP_ASM_W32
     GMP_ASM_ALIGN_LOG
   
     case $host in
       m68*-*-*)
         GMP_ASM_M68K_INSTRUCTION
         GMP_ASM_M68K_ADDRESSING
         GMP_ASM_M68K_BRANCHES
         ;;
       powerpc*-*-*)
         GMP_ASM_POWERPC_R_REGISTERS
         GMP_INCLUDE_MPN(powerpc32/powerpc-defs.m4)
         case $host in
           powerpc*-*-aix*)
             case $ABI in
               64 | aix64) GMP_INCLUDE_MPN(powerpc64/aix.m4) ;;
               *)          GMP_INCLUDE_MPN(powerpc32/aix.m4) ;;
             esac
             ;;
         esac
         ;;
       power*-*-aix*)
         GMP_INCLUDE_MPN(powerpc32/aix.m4)
         ;;
       sparcv9*-*-* | ultrasparc*-*-* | sparc64-*-*)
         case $ABI in
           64)
             GMP_ASM_SPARC_REGISTER
             ;;
         esac
         ;;
       X86_PATTERN)
         GMP_ASM_ALIGN_FILL_0x90
         GMP_ASM_X86_SHLDL_CL
         if test "$enable_profiling" != no; then
           GMP_ASM_X86_MCOUNT
         fi
         case $host in
           *-*-openbsd*)
             GMP_DEFINE(_GLOBAL_OFFSET_TABLE_,__GLOBAL_OFFSET_TABLE_)
             ;;
         esac
         ;;
     esac
   fi
   
   
   # Create link for gmp-mparam.h.
   gmp_mparam_source=
   for gmp_mparam_dir in $path; do
     test "$no_create" = yes || rm -f gmp-mparam.h
     tmp_file=$srcdir/mpn/$gmp_mparam_dir/gmp-mparam.h
     if test -f $tmp_file; then
       AC_CONFIG_LINKS(gmp-mparam.h:mpn/$gmp_mparam_dir/gmp-mparam.h)
       gmp_srclinks="$gmp_srclinks gmp-mparam.h"
       gmp_mparam_source=$tmp_file
       break
     fi
   done
   if test -z "$gmp_mparam_source"; then
     AC_MSG_ERROR([no version of gmp-mparam.h found in path: $path])
   fi
   
   # For a helpful message from tune/tuneup.c
   gmp_mparam_suggest=$gmp_mparam_source
   if test "$gmp_mparam_dir" = generic; then
     for i in $path; do break; done
     if test "$i" != generic; then
       gmp_mparam_suggest="new file $srcdir/mpn/$i/gmp-mparam.h"
     fi
   fi
   AC_DEFINE_UNQUOTED(GMP_MPARAM_H_SUGGEST, "$gmp_mparam_source",
                      [The gmp-mparam.h to update when tuning.])
   
   
   # Copy any SQR_KARATSUBA_THRESHOLD from gmp-mparam.h to config.m4.
   # Some versions of sqr_basecase.asm use this.
   tmp_gmp_karatsuba_sqr_threshold=`sed -n 's/^#define SQR_KARATSUBA_THRESHOLD[    ]*\([0-9][0-9]*\).*$/\1/p' $gmp_mparam_source`
   if test -n "$tmp_gmp_karatsuba_sqr_threshold"; then
     GMP_DEFINE_RAW(["define(<SQR_KARATSUBA_THRESHOLD>,<$tmp_gmp_karatsuba_sqr_threshold>)"])
   fi
   
   # This must come after gmp-mparam.h has been chosen.
   GMP_C_SIZES
   
   GMP_DEFINE_RAW(["define(<GMP_LIMB_BITS>,$BITS_PER_MP_LIMB)"])
   GMP_DEFINE_RAW(["define(<GMP_NAIL_BITS>,$GMP_NAIL_BITS)"])
   GMP_DEFINE_RAW(["define(<GMP_NUMB_BITS>,eval(GMP_LIMB_BITS-GMP_NAIL_BITS))"])
   
   
   # Exclude the mpn random functions from mpbsd since that would drag in the
   # top-level rand things, all of which are unnecessary for libmp.  There's
   # other unnecessary objects too actually, if we could be bothered figuring
   # out exactly which they are.
   #
   mpn_objs_in_libmp=
   for i in $mpn_objs_in_libgmp; do
     case $i in
     *random*) ;;
     *) mpn_objs_in_libmp="$mpn_objs_in_libmp $i" ;;
     esac
   done
   AC_SUBST(mpn_objs_in_libmp)
   
   AC_SUBST(mpn_objects)
   AC_SUBST(mpn_objs_in_libgmp)
   AC_SUBST(gmp_srclinks)
   
   
   # Configs for mpfr.
   #
   if test $enable_mpfr = yes; then
     gmp_CFLAGS=$CFLAGS
     gmp_LIBS=$LIBS
     LIBS="$LIBS $LIBM"
   
     MPFR_CONFIGS
   
     AC_SUBST(MPFR_CFLAGS,$CFLAGS)
     AC_SUBST(MPFR_LIBS,  $LIBS)
     CFLAGS=$gmp_CFLAGS
     LIBS=$gmp_LIBS
   fi
   
   
   # A recompiled sqr_basecase for use in the tune program, if necessary.
   TUNE_SQR_OBJ=
   test -d tune || mkdir tune
   case $sqr_basecase_source in
     *.asm)
       sqr_max=[`sed -n 's/^def...(SQR_KARATSUBA_THRESHOLD_MAX, *\([0-9]*\))/\1/p' $sqr_basecase_source`]
       if test -n "$sqr_max"; then
         TUNE_SQR_OBJ=sqr_asm.o
         AC_DEFINE_UNQUOTED(TUNE_SQR_KARATSUBA_MAX,$sqr_max,
         [Maximum size the tune program can test for SQR_KARATSUBA_THRESHOLD])
       fi
       cat >tune/sqr_basecase.c <<EOF
   /* not sure that an empty file can compile, so put in a dummy */
   int sqr_basecase_dummy;
   EOF
       ;;
     *.c)
       TUNE_SQR_OBJ=
       AC_DEFINE(TUNE_SQR_KARATSUBA_MAX,SQR_KARATSUBA_MAX_GENERIC)
       cat >tune/sqr_basecase.c <<EOF
   #define TUNE_PROGRAM_BUILD 1
   #define TUNE_PROGRAM_BUILD_SQR 1
   #include "mpn/sqr_basecase.c"
   EOF
       ;;
   esac
   AC_SUBST(TUNE_SQR_OBJ)
   
   
   # Configs for demos/pexpr.c.
   #
   AC_CONFIG_FILES(demos/pexpr-config.h:demos/pexpr-config-h.in)
   GMP_SUBST_CHECK_FUNCS(clock, cputime, getrusage, gettimeofday, sigaction, sigaltstack, sigstack)
   GMP_SUBST_CHECK_HEADERS(sys/resource.h)
   AC_CHECK_TYPES([stack_t], HAVE_STACK_T_01=1, HAVE_STACK_T_01=0,
                  [#include <signal.h>])
   AC_SUBST(HAVE_STACK_T_01)
   
   # Configs for demos/calc directory
   #
   # AC_SUBST is used here since with AM_CONFIG_HEADER automake would put
   # demos/calc in the default $(DEFAULT_INCLUDES) for every directory,
   # which would look very strange.  Likewise demos/expr below.
   #
   AC_CONFIG_FILES(demos/calc/calc-config.h:demos/calc/calc-config-h.in)
   use_readline=$with_readline
   if test $with_readline = detect; then
     AC_CHECK_LIB(readline, readline, use_readline=yes)
   fi
   if test $use_readline = yes; then
     AC_SUBST(WITH_READLINE_01, 1)
     AC_SUBST(LIBREADLINE, -lreadline)
   else
     WITH_READLINE_01=0
   fi
   AC_PROG_YACC
   GMP_PROG_LEX
   
   # Configs for demos/expr directory
   AC_CONFIG_FILES(demos/expr/expr-config.h:demos/expr/expr-config-h.in)
   if test $enable_mpfr = yes; then
     AC_SUBST(HAVE_MPFR_01, 1)
   else
     HAVE_MPFR_01=0
   fi
   if test $ac_cv_have_decl_optarg = yes; then
     AC_SUBST(HAVE_DECL_OPTARG, 1)
   else
     HAVE_DECL_OPTARG=0
   fi
   
   
   # Create config.m4.
   GMP_FINISH
   
   # Create Makefiles
   # FIXME: Upcoming version of autoconf/automake may not like broken lines.
   #        Right now automake isn't accepting the new AC_CONFIG_FILES scheme.
   
   AC_OUTPUT(Makefile                                                      \
     mpbsd/Makefile mpf/Makefile mpn/Makefile mpq/Makefile                 \
     mpz/Makefile printf/Makefile scanf/Makefile cxx/Makefile              \
     tests/Makefile tests/devel/Makefile tests/mpbsd/Makefile              \
     tests/mpf/Makefile tests/mpn/Makefile tests/mpq/Makefile              \
     tests/mpz/Makefile tests/rand/Makefile tests/misc/Makefile            \
     tests/cxx/Makefile                                                    \
     mpfr/Makefile mpfr/tests/Makefile                                     \
     tune/Makefile                                                         \
     demos/Makefile demos/calc/Makefile demos/expr/Makefile                \
     gmp.h:gmp-h.in mp.h:mp-h.in)

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  Added in v.1.1.1.4

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