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# Tests for GNU GMP (or any compatible replacement).
dnl Copyright (C) 2008-2017 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl Written by James Youngman.
dnl Check for libgmp. We avoid use of AC_CHECK_LIBS because we don't want to
dnl add this to $LIBS for all targets.
AC_DEFUN([cu_GMP],
[
LIB_GMP=
AC_SUBST([LIB_GMP])
AC_ARG_WITH([gmp],
AS_HELP_STRING([--without-gmp],
[do not use the GNU MP library for arbitrary precision
calculation (default: use it if available)]),
[cu_use_gmp=$withval],
[cu_use_gmp=auto])
if test $cu_use_gmp != no; then
dnl It was noticed on one MacOS X 10.5.8 system at least
dnl that the libs were available but the header wasn't
HAVE_GMP=0
AC_CHECK_HEADERS_ONCE([gmp.h])
if test $ac_cv_header_gmp_h = yes; then
cu_saved_libs=$LIBS
AC_SEARCH_LIBS([__gmpz_init], [gmp],
[test "$ac_cv_search___gmpz_init" = "none required" ||
LIB_GMP=$ac_cv_search___gmpz_init
AC_DEFINE([HAVE_GMP], [1],
[Define if you have GNU libgmp (or replacement)])
HAVE_GMP=1
# This only available in GMP >= 5
AC_CHECK_DECLS([mpz_inits], [], [], [[#include <gmp.h>]])
])
LIBS=$cu_saved_libs
fi
if test $HAVE_GMP != 1; then
AC_MSG_WARN([libgmp development library was not found or not usable.])
AC_MSG_WARN([AC_PACKAGE_NAME will be built without GMP support.])
fi
fi
])
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