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# Is the gmp header file new enough? (should be implemented with an argument)
AC_DEFUN(CL_GMP_H_VERSION,
[AC_CACHE_CHECK([for recent enough gmp.h], cl_cv_new_gmp_h, [
AC_TRY_CPP([#include <gmp.h>
#if !defined(__GNU_MP_VERSION) || (__GNU_MP_VERSION < 3)
#error "ancient gmp.h"
#endif],
cl_cv_new_gmp_h="yes", cl_cv_new_gmp_h="no")
])])dnl
# Does libgmp provide some functionality introduced in version 3.0?
AC_DEFUN(CL_GMP_CHECK,
[AC_CACHE_CHECK([for working libgmp], cl_cv_new_libgmp, [
SAVELIBS=$LIBS
LIBS="$LIBS -lgmp"
AC_TRY_LINK([#include <gmp.h>],[mpn_divexact_by3(0,0,0)],
cl_cv_new_libgmp="yes", cl_cv_new_libgmp="no"; LIBS=$SAVELIBS)
])])
# What is sizeof(mp_limb_t)? (It has to match sizeof(uintD) later.)
AC_DEFUN(CL_GMP_SET_UINTD,
[AC_CACHE_CHECK([how large gmp demands uintD to be], cl_cv_gmp_set_uintd, [
AC_TRY_RUN([#include <stdio.h>
#include <gmp.h>
int main() {
FILE *f=fopen("conftestval", "w");
if (!f) return(255);
if (sizeof(mp_limb_t) > sizeof(long))
fprintf(f, "long long");
else if (sizeof(mp_limb_t) == sizeof(long))
fprintf(f, "long");
else if (sizeof(mp_limb_t) == sizeof(int))
fprintf(f, "int");
else return(sizeof(mp_limb_t));
#if defined(__GMP_BITS_PER_MP_LIMB)
/* Is there a nail in a limb? */
if (8*sizeof(mp_limb_t)!=__GMP_BITS_PER_MP_LIMB)
return(254);
#endif
return(0);
}], cl_cv_gmp_set_uintd=`cat conftestval`
cl_gmp_demands="GMP_DEMANDS_UINTD_`echo ${cl_cv_gmp_set_uintd} | sed -e 'y/ gilnot/_GILNOT/'`",
gmp_retval="$ac_status"
if test x$gmp_retval = "x255"; then AC_MSG_ERROR([error opening output file.]); fi
if test x$gmp_retval = "x254"; then AC_MSG_ERROR([nails in MP limbs are unsupported.]); fi
AC_MSG_ERROR([Don't know which C-type has sizeof $gmp_retval.]),
AC_MSG_ERROR([cross-compiling - cannot determine]))
])
AC_DEFINE_UNQUOTED($cl_gmp_demands)
])
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