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Diffstat (limited to 'm4/gmp.m4')
| -rw-r--r-- | m4/gmp.m4 | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/m4/gmp.m4 b/m4/gmp.m4 new file mode 100644 index 0000000..20ae9b4 --- /dev/null +++ b/m4/gmp.m4 @@ -0,0 +1,48 @@ +# Tests for GNU GMP (or any compatible replacement). + +dnl Copyright (C) 2008-2020 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 +]) |