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125 lines
4.0 KiB
125 lines
4.0 KiB
dnl -*- Autoconf -*-
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dnl Copyright (C) 1993-2008 Free Software Foundation, Inc.
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dnl This file is free software, distributed under the terms of the GNU
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dnl General Public License. As a special exception to the GNU General
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dnl Public License, this file may be distributed as part of a program
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dnl that contains a configuration script generated by Autoconf, under
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dnl the same distribution terms as the rest of that program.
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dnl From Richard B. Kreckel.
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AC_PREREQ(2.13)
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dnl Is the gmp header file new enough? (should be implemented with an argument)
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AC_DEFUN([CL_GMP_H_VERSION],
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[AC_CACHE_CHECK([for recent enough gmp.h], cl_cv_new_gmp_h, [
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AC_TRY_CPP([#include <gmp.h>
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#if !defined(__GNU_MP_VERSION) || (__GNU_MP_VERSION < 3)
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#error "ancient gmp.h"
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#endif],
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cl_cv_new_gmp_h="yes", cl_cv_new_gmp_h="no")
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])])dnl
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dnl Does libgmp provide some functionality introduced in version 3.0?
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AC_DEFUN([CL_GMP_CHECK],
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[AC_CACHE_CHECK([for working libgmp], cl_cv_new_libgmp, [
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SAVELIBS=$LIBS
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LIBS="$LIBS -lgmp"
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AC_TRY_LINK([#include <gmp.h>],[mpn_divexact_by3(0,0,0)],
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cl_cv_new_libgmp="yes", cl_cv_new_libgmp="no")
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LIBS=$SAVELIBS])
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if test "$cl_cv_new_libgmp" = yes; then
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LIBS="$LIBS -lgmp"
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fi
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])
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dnl What is sizeof(mp_limb_t)? (It has to match sizeof(uintD) later.)
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AC_DEFUN([CL_GMP_SET_UINTD],
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[AC_CACHE_CHECK([how large gmp demands uintD to be], cl_cv_gmp_set_uintd, [
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AC_TRY_RUN([#include <gmp.h>
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#include <stdio.h>
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int main() {
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FILE *f=fopen("conftestval", "w");
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if (!f) return(255);
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if (sizeof(mp_limb_t) > sizeof(long))
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fprintf(f, "long long");
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else if (sizeof(mp_limb_t) == sizeof(long))
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fprintf(f, "long");
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else if (sizeof(mp_limb_t) == sizeof(int))
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fprintf(f, "int");
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else return(sizeof(mp_limb_t));
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#if defined(__GMP_BITS_PER_MP_LIMB)
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/* Is there a nail in a limb? */
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if (8*sizeof(mp_limb_t)!=__GMP_BITS_PER_MP_LIMB)
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return(254);
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#endif
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return(0);
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}], cl_cv_gmp_set_uintd=`cat conftestval`
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cl_gmp_demands="GMP_DEMANDS_UINTD_`echo ${cl_cv_gmp_set_uintd} | sed -e 'y/ gilnot/_GILNOT/'`",
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gmp_retval="$ac_status"
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if test x$gmp_retval = "x255"; then AC_MSG_ERROR([error opening output file.]); fi
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if test x$gmp_retval = "x254"; then AC_MSG_ERROR([nails in MP limbs are unsupported.]); fi
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AC_MSG_ERROR([Don't know which C-type has sizeof $gmp_retval.]),
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AC_MSG_ERROR([cross-compiling - cannot determine]))
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])
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AC_DEFINE_UNQUOTED($cl_gmp_demands)
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])
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dnl Whether or not to use GMP. Sets CL_USE_GMP.
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dnl Also sets CPPFLAGS, LDFLAGS if --with-gmp=DIR was specified.
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AC_DEFUN([CL_LIBGMP],
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[AC_ARG_WITH(gmp, AS_HELP_STRING([--with-gmp@<:@=DIR@:>@],
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[use external low-level functions from GNU MP (installed in prefix DIR) @<:@default=yes@:>@.]),[
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with_gmp="$withval"
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],
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with_gmp="yes")
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case $with_gmp in
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yes)
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dnl --with-gmp
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CL_GMP_H_VERSION
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if test "$cl_cv_new_gmp_h" = yes; then
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CL_GMP_CHECK
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if test "$cl_cv_new_libgmp" = yes; then
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CL_GMP_SET_UINTD
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AC_DEFINE(CL_USE_GMP)
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else
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AC_MSG_WARN([The GNU MP library is too old to be used.])
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fi
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else
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AC_MSG_WARN([The header file <gmp.h> is too old to be used.])
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fi
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;;
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no)
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dnl --without-gmp
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;;
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*)
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dnl --with-gmp=DIR
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case $withval in
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[[\\/$]]* | ?:[[\\/]]* )
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;;
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*) AC_MSG_ERROR([expected an absolute directory name for --with-gmp: $withval])
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;;
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esac
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saved_CPPFLAGS="$CPPFLAGS"
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CPPFLAGS="$CPPFLAGS -I${withval}/include"
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saved_LDFLAGS="$LDFLAGS"
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LDFLAGS="$LDFLAGS -L${withval}/lib"
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CL_GMP_H_VERSION
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if test "$cl_cv_new_gmp_h" = yes; then
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CL_GMP_CHECK
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if test "$cl_cv_new_libgmp" = yes; then
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CL_GMP_SET_UINTD
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AC_DEFINE(CL_USE_GMP)
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else
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AC_MSG_WARN([The GNU MP library is too old to be used.])
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CPPFLAGS="$saved_CPPFLAGS"
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LDFLAGS="$saved_LDFLAGS"
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fi
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else
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AC_MSG_WARN([The header file <gmp.h> is too old to be used.])
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CPPFLAGS="$saved_CPPFLAGS"
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LDFLAGS="$saved_LDFLAGS"
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fi
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;;
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esac
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])
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