dnl  Process this file with autoconf to produce a configure script.


AC_COPYRIGHT([

Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002 Free Software
Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
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_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 $enable_nails in
yes) GMP_NAIL_BITS=1 ;;
no)  GMP_NAIL_BITS=0 ;;
*)   GMP_NAIL_BITS=$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 2.10.0 doesn't accept -mev67, but -mev6 is enough for ctlz
    # and cttz, as used by longlong.h on ev67.
    #
    # 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"
    cc_cflags="-O3 -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"
        # +O2 to cc triggers bug in mpz/powm.c (cvs version 1.4)
        cc_20n_cflags="+DA2.0 +e +O3"
        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 +O3"
          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"
        cc_n32_cflags="-O2 -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)
        # CPU type powerpc64 forces to a 64-bit limb
        case $host in
          powerpc64-*-*) abilist="32L" ;;
          *)             abilist="32L 32" ;;
        esac
        cclist_32L="gcc"
        gcc_32L_cflags="-g -O2 -mpowerpc64"
        gcc_32L_cflags_optlist="cpu"
        limb_32L=longlong
        path_32L="powerpc64"
        extra_functions_32L="umul"

        # 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 $abilist"
            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"

    # 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

    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"
	    # -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
            ;;
        esac
      ;;
    esac
    ;;


  # VAX
  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

    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 $flag in
          -march=pentiumpro)
            # tickles stack slot bugs on some gcc, exclude as necessary
            GMP_GCC_MARCH_PENTIUMPRO($cc,,continue)
            ;;
          -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])
            ;;
        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\"
  case $enable_nails in
  no | 0)  path="$tmp generic" ;;
  *)       # FIXME: Where will assembler code for nails live?
           path="generic" ;;
  esac
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

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

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


# 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


# 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
    # 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
    ;;
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


# 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
GMP_C_STDARG
GMP_C_ATTRIBUTE_CONST
GMP_C_ATTRIBUTE_MALLOC
GMP_C_ATTRIBUTE_MODE
GMP_C_ATTRIBUTE_NORETURN
GMP_C_RESTRICT

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.

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 mul_2 sqr_diagonal"

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 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

  # Don't need pre_mod_1 if it's already been provided (by an asm mod_1).
  case $tmp_fn in
  pre_mod_1)
    if test "$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 $tmp_file; then
          found=yes
          eval found_$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 $host in
            POWERPC64_PATTERN) GMP_INCLUDE_MPN(powerpc64/aix.m4) ;;
            *)                 GMP_INCLUDE_MPN(powerpc32/aix.m4) ;;
          esac
          ;;
      esac
      ;;
    power*-*-aix*)
      GMP_INCLUDE_MPN(powerpc32/aix.m4)
      ;;
    X86_PATTERN)
      GMP_ASM_ALIGN_FILL_0x90
      GMP_ASM_X86_SHLDL_CL
      if test "$enable_profiling" != no; then
        GMP_ASM_X86_MCOUNT
      fi
      ;;
  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

  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)