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

define(GMP_COPYRIGHT,[[

Copyright 1996-2016 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 either:

  * the GNU Lesser General Public License as published by the Free

    Software Foundation; either version 3 of the License, or (at your

    option) any later version.

or

  * the GNU General Public License as published by the Free Software

    Foundation; either version 2 of the License, or (at your option) any

    later version.

or both in parallel, as here.

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 General Public License

for more details.

You should have received copies of the GNU General Public License and the

GNU Lesser General Public License along with the GNU MP Library.  If not,

see https://www.gnu.org/licenses/.

]])

AC_COPYRIGHT(GMP_COPYRIGHT)

AH_TOP(/*GMP_COPYRIGHT*/)

AC_REVISION($Revision$)

AC_PREREQ(2.59)

AC_INIT(GNU MP, GMP_VERSION, [gmp-bugs@gmplib.org, see https://gmplib.org/manual/Reporting-Bugs.html], gmp)

AC_CONFIG_SRCDIR(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)

m4_pattern_allow(GMP_NONSTD_ABI)

m4_pattern_allow(GMP_CPU_TYPE)

# 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

dnl  Automake "no-dependencies" is used because include file dependencies

dnl  are not useful to us.  Pretty much everything depends just on gmp.h,

dnl  gmp-impl.h and longlong.h, and yet only rarely does everything need to

dnl  be rebuilt for changes to those files.

dnl

dnl  "no-dependencies" also helps with the way we're setup to run

dnl  AC_PROG_CXX only conditionally.  If dependencies are used then recent

dnl  automake (eg 1.7.2) appends an AM_CONDITIONAL to AC_PROG_CXX, and then

dnl  gets upset if it's not actually executed.

dnl

dnl  Note that there's a copy of these options in the top-level Makefile.am,

dnl  so update there too if changing anything.

dnl

AM_INIT_AUTOMAKE([1.8 gnu no-dependencies])

AC_CONFIG_HEADERS(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,

  [Define to 1 to enable ASSERT checking, per --enable-assert])

  want_assert_01=1

else

  want_assert_01=0

fi

GMP_DEFINE_RAW(["define(<WANT_ASSERT>,$want_assert_01)"])

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(assembly,

AC_HELP_STRING([--enable-assembly],[enable the use of assembly loops [default=yes]]),

[case $enableval in

yes|no) ;;

*) AC_MSG_ERROR([bad value $enableval for --enable-assembly, need yes or no]) ;;

esac],

[enable_assembly=yes])

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,

  [Define to 1 to enable FFTs for multiplication, per --enable-fft])

fi

AC_ARG_ENABLE(old-fft-full,

AC_HELP_STRING([--enable-old-fft-full],[enable old mpn_mul_fft_full for multiplication [default=no]]),

[case $enableval in

yes|no) ;;

*) AC_MSG_ERROR([bad value $enableval for --enable-old-fft-full, need yes or no]) ;;

esac],

[enable_old_fft_full=no])

if test "$enable_old_fft_full" = "yes"; then

  AC_DEFINE(WANT_OLD_FFT_FULL,1,

  [Define to 1 to enable old mpn_mul_fft_full for multiplication, per --enable-old-fft-full])

fi

AC_ARG_ENABLE(nails,

AC_HELP_STRING([--enable-nails],[use nails on limbs [default=no]]),

[case $enableval in

[yes|no|[02468]|[0-9][02468]]) ;;

[*[13579]])

  AC_MSG_ERROR([bad value $enableval for --enable-nails, only even nail sizes supported]) ;;

*)

  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|instrument) ;;

*) AC_MSG_ERROR([bad value $enableval for --enable-profiling, need no/prof/gprof/instrument]) ;;

esac],

[enable_profiling=no])

case $enable_profiling in

  prof)

    AC_DEFINE(WANT_PROFILING_PROF, 1,

              [Define to 1 if --enable-profiling=prof])

    ;;

  gprof)

    AC_DEFINE(WANT_PROFILING_GPROF, 1,

              [Define to 1 if --enable-profiling=gprof])

    ;;

  instrument)

    AC_DEFINE(WANT_PROFILING_INSTRUMENT, 1,

              [Define to 1 if --enable-profiling=instrument])

    ;;

esac

GMP_DEFINE_RAW(["define(<WANT_PROFILING>,<\`$enable_profiling'>)"])

# -fomit-frame-pointer is incompatible with -pg on some chips

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 demo programs [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])

AC_ARG_ENABLE(fat,

AC_HELP_STRING([--enable-fat],

               [build fat libraries on systems that support it [default=no]]),

[case $enableval in

yes|no) ;;

*) AC_MSG_ERROR([bad value $enableval for --enable-fat, need yes or no]) ;;

esac],

[enable_fat=no])

AC_ARG_ENABLE(minithres,

AC_HELP_STRING([--enable-minithres],

               [choose minimal thresholds for testing [default=no]]),

[case $enableval in

yes|no) ;;

*) AC_MSG_ERROR([bad value $enableval for --enable-minithres, need yes or no]) ;;

esac],

[enable_minithres=no])

AC_ARG_ENABLE(fake-cpuid,

AC_HELP_STRING([--enable-fake-cpuid],[enable GMP_CPU_TYPE faking cpuid [default=no]]),

[case $enableval in

yes|no) ;;

*) AC_MSG_ERROR([bad value $enableval for --enable-fake-cpuid, need yes or no]) ;;

esac],

[enable_fake_cpuid=no])

if test "$enable_fake_cpuid" = "yes"; then

  AC_DEFINE(WANT_FAKE_CPUID,1,

  [Define to 1 to enable GMP_CPU_TYPE faking cpuid, per --enable-fake-cpuid])

fi

if test $enable_fat = yes && test $enable_assembly = no ; then

  AC_MSG_ERROR([when doing a fat build, disabling assembly will not work])

fi

if test $enable_fake_cpuid = yes && test $enable_fat = no ; then

  AC_MSG_ERROR([--enable-fake-cpuid requires --enable-fat])

fi

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)

dnl  The HAVE_HOST_CPU_ list here only needs to have entries for those which

dnl  are going to be tested, not everything that can possibly be selected.

dnl

dnl  The HAVE_HOST_CPU_FAMILY_ list similarly, and note that the AC_DEFINEs

dnl  for these are under the cpu specific setups below.

AH_VERBATIM([HAVE_HOST_CPU_1],

[/* Define one of these to 1 for the host CPU family.

   If your CPU is not in any of these families, leave all undefined.

   For an AMD64 chip, define "x86" in ABI=32, but not in ABI=64. */

#undef HAVE_HOST_CPU_FAMILY_alpha

#undef HAVE_HOST_CPU_FAMILY_m68k

#undef HAVE_HOST_CPU_FAMILY_power

#undef HAVE_HOST_CPU_FAMILY_powerpc

#undef HAVE_HOST_CPU_FAMILY_x86

#undef HAVE_HOST_CPU_FAMILY_x86_64

/* Define one of the following to 1 for the host CPU, as per the output of

   ./config.guess.  If your CPU is not listed here, leave all undefined.  */

#undef HAVE_HOST_CPU_alphaev67

#undef HAVE_HOST_CPU_alphaev68

#undef HAVE_HOST_CPU_alphaev7

#undef HAVE_HOST_CPU_m68020

#undef HAVE_HOST_CPU_m68030

#undef HAVE_HOST_CPU_m68040

#undef HAVE_HOST_CPU_m68060

#undef HAVE_HOST_CPU_m68360

#undef HAVE_HOST_CPU_powerpc604

#undef HAVE_HOST_CPU_powerpc604e

#undef HAVE_HOST_CPU_powerpc750

#undef HAVE_HOST_CPU_powerpc7400

#undef HAVE_HOST_CPU_supersparc

#undef HAVE_HOST_CPU_i386

#undef HAVE_HOST_CPU_i586

#undef HAVE_HOST_CPU_i686

#undef HAVE_HOST_CPU_pentium

#undef HAVE_HOST_CPU_pentiummmx

#undef HAVE_HOST_CPU_pentiumpro

#undef HAVE_HOST_CPU_pentium2

#undef HAVE_HOST_CPU_pentium3

#undef HAVE_HOST_CPU_s390_z900

#undef HAVE_HOST_CPU_s390_z990

#undef HAVE_HOST_CPU_s390_z9

#undef HAVE_HOST_CPU_s390_z10

#undef HAVE_HOST_CPU_s390_z196

/* Define to 1 iff we have a s390 with 64-bit registers.  */

#undef HAVE_HOST_CPU_s390_zarch])

# 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_cflags_maybe     flags for compiler xx, if they work

#   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

#   fat_path            fat binary mpn search path [if fat binary desired]

#   fat_functions       fat functions

#   fat_thresholds      fat thresholds

#

# 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_cflags_maybe    flags for xx in ABI aa, if they work

#   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="-O2 -pedantic"

gcc_64_cflags="-O2 -pedantic"

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

  alpha*-*-*)

    AC_DEFINE(HAVE_HOST_CPU_FAMILY_alpha)

    case $host_cpu in

      alphaev5* | alphapca5*)

	path="alpha/ev5 alpha" ;;

      alphaev67 | alphaev68 | alphaev7*)

        path="alpha/ev67 alpha/ev6 alpha" ;;

      alphaev6)

	path="alpha/ev6 alpha" ;;

      *)

        path="alpha" ;;

    esac

    if test "$enable_assembly" = "yes" ; then

       extra_functions="cntlz"

    fi

    gcc_cflags_optlist="asm cpu oldas" # need asm ahead of cpu, see below

    gcc_cflags_maybe="-mieee"

    gcc_cflags_oldas="-Wa,-oldas"     # see GMP_GCC_WA_OLDAS.

    # gcc 2.7.2.3 doesn't know any -mcpu= for alpha, apparently.

    # gcc 2.95 knows -mcpu= ev4, ev5, ev56, pca56, ev6.

    # gcc 3.0 adds nothing.

    # gcc 3.1 adds ev45, ev67 (but ev45 is the same as ev4).

    # gcc 3.2 adds nothing.

    #

    # gcc version "2.9-gnupro-99r1" under "-O2 -mcpu=ev6" strikes internal

    # compiler errors too easily and is rejected by GMP_PROG_CC_WORKS.  Each

    # -mcpu=ev6 below has a fallback to -mcpu=ev56 for this reason.

    #

    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 -mcpu=ev56" ;;

      alphaev67 | alphaev68 | alphaev7*)

                    gcc_cflags_cpu="-mcpu=ev67 -mcpu=ev6 -mcpu=ev56" ;;

    esac

    # gcc version "2.9-gnupro-99r1" on alphaev68-dec-osf5.1 has been seen

    # accepting -mcpu=ev6, but not putting the assembler in the right mode

    # for what it produces.  We need to do this for it, and need to do it

    # before testing the -mcpu options.

    #

    # 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.  gcc

    # establishes what it needs with a ".arch" directive, our command line

    # option seems to override that.

    #

    # 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 | alphaev7*)

                    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.

    #

    GMP_INCLUDE_MPN(alpha/alpha-defs.m4)

    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 | alphaev7*)

            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*-*-* | aarch64*-*-*)

    abilist="32"

    gcc_cflags="$gcc_cflags $fomit_frame_pointer"

    gcc_cflags_optlist="arch fpmode neon tune"

    gcc_64_cflags_optlist="arch tune"

    gcc_testlist="gcc-arm-umodsi"

    gcc_64_testlist=""

    CALLING_CONVENTIONS_OBJS='arm32call.lo arm32check.lo'

    CALLING_CONVENTIONS_OBJS_64=""

    cclist_64="gcc cc"

    any_32_testlist="sizeof-long-4"

    any_64_testlist="sizeof-long-8"

    # This is needed for clang, which is not content with flags like -mfpu=neon

    # alone.

    case $host in

      *-*-*eabi)

        gcc_cflags_fpmode="-mfloat-abi=softfp" ;;

      *-*-*eabihf)

        gcc_cflags_fpmode="-mfloat-abi=hard" ;;

    esac

    # FIXME: We make mandatory compiler options optional here.  We should

    # either enforce them, or organise to strip paths as the corresponding

    # options fail.

    case $host_cpu in

      armxscale | arm7ej | arm9te | arm9e* | arm10* | armv5*)

	path="arm/v5 arm"

	gcc_cflags_arch="-march=armv5"

	;;

      armsa1 | arm7t* | arm9t* | armv4t*)

	path="arm"

	gcc_cflags_arch="-march=armv4"

	;;

      arm1156 | armv6t2*)

	path="arm/v6t2 arm/v6 arm/v5 arm"

	gcc_cflags_arch="-march=armv6t2"

	;;

      arm11* | armv6*)

	path="arm/v6 arm/v5 arm"

	gcc_cflags_arch="-march=armv6"

	;;

      armcortexa5 | armv7*)

	path="arm/v6t2 arm/v6 arm/v5 arm"

	gcc_cflags_arch="-march=armv7-a"

	gcc_cflags_tune="-mtune=cortex-a5"

	;;

      armcortexa5neon)

	path="arm/neon arm/v6t2 arm/v6 arm/v5 arm"

	gcc_cflags_neon="-mfpu=neon"

	gcc_cflags_arch="-march=armv7-a"

	gcc_cflags_tune="-mtune=cortex-a5"

	;;

      armcortexa7)

	path="arm/v7a/cora7 arm/v6t2 arm/v6 arm/v5 arm"

	gcc_cflags_arch="-march=armv7-a"

	gcc_cflags_tune="-mtune=cortex-a7"

	;;

      armcortexa7neon)

	path="arm/neon arm/v7a/cora7 arm/v6t2 arm/v6 arm/v5 arm"

	gcc_cflags_arch="-march=armv7-a"

	gcc_cflags_neon="-mfpu=neon"

	gcc_cflags_tune="-mtune=cortex-a7"

	;;

      armcortexa8)

	path="arm/v7a/cora8 arm/v6t2 arm/v6 arm/v5 arm"

	gcc_cflags_arch="-march=armv7-a"

	gcc_cflags_tune="-mtune=cortex-a8"

	;;

      armcortexa8neon)

	path="arm/neon arm/v7a/cora8 arm/v6t2 arm/v6 arm/v5 arm"

	gcc_cflags_arch="-march=armv7-a"

	gcc_cflags_neon="-mfpu=neon"

	gcc_cflags_tune="-mtune=cortex-a8"

	;;

      armcortexa9)

	path="arm/v7a/cora9 arm/v6t2 arm/v6 arm/v5 arm"

	gcc_cflags_arch="-march=armv7-a"

	gcc_cflags_tune="-mtune=cortex-a9"

	;;

      armcortexa9neon)

	path="arm/neon arm/v7a/cora9 arm/v6t2 arm/v6 arm/v5 arm"

	gcc_cflags_arch="-march=armv7-a"

	gcc_cflags_neon="-mfpu=neon"

	gcc_cflags_tune="-mtune=cortex-a9"

	;;

      armcortexa15)

	path="arm/v7a/cora15 arm/v6t2 arm/v6 arm/v5 arm"

	gcc_cflags_arch="-march=armv7-a"

	gcc_cflags_tune="-mtune=cortex-a15 -mtune=cortex-a9"

	;;

      armcortexa15neon)

	path="arm/v7a/cora15/neon arm/neon arm/v7a/cora15 arm/v6t2 arm/v6 arm/v5 arm"

	gcc_cflags_arch="-march=armv7-a"

	gcc_cflags_neon="-mfpu=neon"

	gcc_cflags_tune="-mtune=cortex-a15 -mtune=cortex-a9"

	;;

      armcortexa53 | armcortexa53neon)

        abilist="64 32"

	path="arm/neon arm/v7a/cora9 arm/v6t2 arm/v6 arm/v5 arm"

	path_64="arm64/cora53 arm64"

	gcc_cflags_arch="-march=armv8-a"

	gcc_cflags_neon="-mfpu=neon"

	gcc_cflags_tune="-mtune=cortex-a53"

	;;

      armcortexa57 | armcortexa57neon)

        abilist="64 32"

	path="arm/v7a/cora15/neon arm/neon arm/v7a/cora15 arm/v6t2 arm/v6 arm/v5 arm"

	path_64="arm64/cora57 arm64"

	gcc_cflags_arch="-march=armv8-a"

	gcc_cflags_neon="-mfpu=neon"

	gcc_cflags_tune="-mtune=cortex-a57"

	;;

      armcortexa72 | armcortexa72neon)

        abilist="64 32"

	path="arm/v7a/cora15/neon arm/neon arm/v7a/cora15 arm/v6t2 arm/v6 arm/v5 arm"

	path_64="arm64/cora72 arm64"

	gcc_cflags_arch="-march=armv8-a"

	gcc_cflags_neon="-mfpu=neon"

	gcc_cflags_tune="-mtune=cortex-a72"

	;;

      armexynosm1)

        abilist="64 32"

	path="arm/v7a/cora15/neon arm/neon arm/v7a/cora15 arm/v6t2 arm/v6 arm/v5 arm"

	path_64="arm64"

	gcc_cflags_arch="-march=armv8-a"

	gcc_cflags_neon="-mfpu=neon"

	gcc_cflags_tune="-mtune=exynosm1"

	;;

      armthunderx)

        abilist="64 32"

	path="arm/v7a/cora15/neon arm/neon arm/v7a/cora15 arm/v6t2 arm/v6 arm/v5 arm"

	path_64="arm64"

	gcc_cflags_arch="-march=armv8-a"

	gcc_cflags_neon="-mfpu=neon"

	gcc_cflags_tune="-mtune=thunderx"

	;;

      armxgene1)

        abilist="64 32"

	path="arm/v7a/cora15/neon arm/neon arm/v7a/cora15 arm/v6t2 arm/v6 arm/v5 arm"

	path_64="arm64/xgene1 arm64"

	gcc_cflags_arch="-march=armv8-a"

	gcc_cflags_neon="-mfpu=neon"

	gcc_cflags_tune="-mtune=xgene1"

	;;

      aarch64*)

        abilist="64 32"

	path="arm/v7a/cora15/neon arm/neon arm/v7a/cora15 arm/v6t2 arm/v6 arm/v5 arm"

	path_64="arm64"

	gcc_cflags_arch="-march=armv8-a"

	gcc_cflags_neon="-mfpu=neon"

	gcc_cflags_tune=""

	;;

      *)

	path="arm"

	gcc_cflags_arch="-march=armv4"

	GMP_DEFINE_RAW(["define(<NOTHUMB>,1)"])

	;;

    esac

    ;;

  # Fujitsu

  [f30[01]-fujitsu-sysv*])

    cclist="gcc vcc"

    # FIXME: flags for vcc?

    vcc_cflags="-g"

    path="fujitsu"

    ;;

  hppa*-*-*)

    # HP cc (the one sold separately) 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.

    #

    # gcc for hppa 2.0 can be built either for 2.0n (32-bit) or 2.0w

    # (64-bit), but not both, so there's no option to choose the desired

    # mode, we must instead detect which of the two it is.  This is done by

    # checking sizeof(long), either 4 or 8 bytes respectively.  Do this in

    # ABI=1.0 too, in case someone tries to build that with a 2.0w gcc.

    #

    gcc_cflags_optlist="arch"

    gcc_testlist="sizeof-long-4"

    SPEED_CYCLECOUNTER_OBJ=hppa.lo

    cyclecounter_size=1

    # FIXME: For hppa2.0*, path should be "pa32/hppa2_0 pa32/hppa1_1 pa32".

    # (Can't remember why this isn't done already, have to check what .asm

    # files are available in each and how they run on a typical 2.0 cpu.)

    #

    case $host_cpu in

      hppa1.0*)    path="pa32" ;;

      hppa7000*)   path="pa32/hppa1_1 pa32" ;;

      hppa2.0* | hppa64)

                   path="pa32/hppa2_0 pa32/hppa1_1/pa7100 pa32/hppa1_1 pa32" ;;

      *)           # default to 7100

                   path="pa32/hppa1_1/pa7100 pa32/hppa1_1 pa32" ;;

    esac

    # gcc 2.7.2.3 knows -mpa-risc-1-0 and -mpa-risc-1-1

    # gcc 2.95 adds -mpa-risc-2-0, plus synonyms -march=1.0, 1.1 and 2.0

    #

    # We don't use -mpa-risc-2-0 in ABI=1.0 because 64-bit registers may not

    # be saved by the kernel on an old system.  Actually gcc (as of 3.2)

    # only adds a few float instructions with -mpa-risc-2-0, so it would

    # probably be safe, but let's not take the chance.  In any case, a

    # configuration like --host=hppa2.0 ABI=1.0 is far from optimal.

    #

    case $host_cpu in

      hppa1.0*)           gcc_cflags_arch="-mpa-risc-1-0" ;;

      *)                  # default to 7100

                          gcc_cflags_arch="-mpa-risc-1-1" ;;

    esac

    case $host_cpu in

      hppa1.0*)    cc_cflags="+O2" ;;

      *)           # default to 7100

                   cc_cflags="+DA1.1 +O2" ;;

    esac

    case $host in

      hppa2.0*-*-* | hppa64-*-*)

	cclist_20n="gcc cc"

        abilist="2.0n 1.0"

        path_20n="pa64"

	limb_20n=longlong

        any_20n_testlist="sizeof-long-4"

        SPEED_CYCLECOUNTER_OBJ_20n=hppa2.lo

        cyclecounter_size_20n=2

        # -mpa-risc-2-0 is only an optional flag, in case an old gcc is

        # used.  Assembler support for 2.0 is essential though, for our asm

        # files.

	gcc_20n_cflags="$gcc_cflags"

	gcc_20n_cflags_optlist="arch"

        gcc_20n_cflags_arch="-mpa-risc-2-0 -mpa-risc-1-1"

        gcc_20n_testlist="sizeof-long-4 hppa-level-2.0"

        cc_20n_cflags="+DA2.0 +e +O2 -Wl,+vnocompatwarnings"

        cc_20n_testlist="hpc-hppa-2-0"

	# ABI=2.0w is available for hppa2.0w and hppa2.0, but not for

	# hppa2.0n, on the assumption that that the latter indicates a

	# desire for ABI=2.0n.

	case $host in

        hppa2.0n-*-*) ;;

        *)

          # HPUX 10 and earlier cannot run 2.0w.  Not sure about other

          # systems (GNU/Linux for instance), but lets assume they're ok.

          case $host in

            [*-*-hpux[1-9] | *-*-hpux[1-9].* | *-*-hpux10 | *-*-hpux10.*]) ;;

	    [*-*-linux*])  abilist="1.0" ;; # due to linux permanent kernel bug

            *)    abilist="2.0w $abilist" ;;

          esac

          cclist_20w="gcc cc"

	  gcc_20w_cflags="$gcc_cflags -mpa-risc-2-0"

          cc_20w_cflags="+DD64 +O2"

          cc_20w_testlist="hpc-hppa-2-0"

          path_20w="pa64"

	  any_20w_testlist="sizeof-long-8"

          SPEED_CYCLECOUNTER_OBJ_20w=hppa2w.lo

          cyclecounter_size_20w=2

	  ;;

        esac

        ;;

    esac

    ;;

  IA64_PATTERN)

    abilist="64"

    GMP_INCLUDE_MPN(ia64/ia64-defs.m4)

    SPEED_CYCLECOUNTER_OBJ=ia64.lo

    any_32_testlist="sizeof-long-4"

    case $host_cpu in

      itanium)   path="ia64/itanium  ia64" ;;

      itanium2)  path="ia64/itanium2 ia64" ;;

      *)         path="ia64" ;;

    esac

    gcc_64_cflags_optlist="tune"

    gcc_32_cflags_optlist=$gcc_64_cflags_optlist

    # gcc pre-release 3.4 adds -mtune itanium and itanium2