diff options
Diffstat (limited to 'm4/libgmp.m4')
| -rw-r--r-- | m4/libgmp.m4 | 65 |
1 files changed, 44 insertions, 21 deletions
diff --git a/m4/libgmp.m4 b/m4/libgmp.m4 index b569bb73462..82c065e2c2c 100644 --- a/m4/libgmp.m4 +++ b/m4/libgmp.m4 @@ -1,44 +1,67 @@ +# libgmp.m4 serial 4 # Configure the GMP library or a replacement. - dnl Copyright 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 gl_LIBGMP +dnl Search for an installed libgmp. +dnl If found, set and AC_SUBST HAVE_LIBGMP=yes and the LIBGMP and LTLIBGMP +dnl variables, and augment the CPPFLAGS variable, and #define HAVE_LIBGMP to 1. +dnl Otherwise, set and AC_SUBST HAVE_LIBGMP=no and LIBGMP and LTLIBGMP to +dnl empty. + AC_DEFUN([gl_LIBGMP], [ AC_ARG_WITH([libgmp], [AS_HELP_STRING([--without-libgmp], [do not use the GNU Multiple Precision (GMP) library; this is the default on systems lacking libgmp.])]) - - AC_CHECK_HEADERS_ONCE([gmp.h]) - GMP_H=gmp.h - LIB_GMP= - - case $with_libgmp in - no) ;; - yes) GMP_H= LIB_GMP=-lgmp;; - *) if test "$ac_cv_header_gmp_h" = yes; then - gl_saved_LIBS=$LIBS + case "$with_libgmp" in + no) + HAVE_LIBGMP=no + LIBGMP= + LTLIBGMP= + ;; + *) + dnl Prefer AC_LIB_HAVE_LINKFLAGS if the havelib module is also in use. + m4_ifdef([gl_HAVE_MODULE_HAVELIB], + [AC_LIB_HAVE_LINKFLAGS([gmp], [], + [#include <gmp.h>], + [static const mp_limb_t x[2] = { 0x73, 0x55 }; + mpz_t tmp; + mpz_roinit_n (tmp, x, 2); + ], + [no])], + [gl_saved_LIBS=$LIBS AC_SEARCH_LIBS([__gmpz_roinit_n], [gmp]) LIBS=$gl_saved_LIBS case $ac_cv_search___gmpz_roinit_n in 'none needed') - GMP_H=;; + HAVE_LIBGMP=yes LIBGMP=;; -*) - GMP_H= LIB_GMP=$ac_cv_search___gmpz_roinit_n;; + HAVE_LIBGMP=yes LIBGMP=$ac_cv_search___gmpz_roinit_n;; + *) + HAVE_LIBGMP=no LIBGMP=;; esac - fi;; + LTLIBGMP=$LIBGMP + AC_SUBST([HAVE_LIBGMP]) + AC_SUBST([LIBGMP]) + AC_SUBST([LTLIBGMP])]) + if test "$with_libgmp,$HAVE_LIBGMP" = yes,no; then + AC_MSG_ERROR( + [GMP not found, although --with-libgmp was specified.m4_ifdef( + [AC_LIB_HAVE_LINKFLAGS], + [ Try specifying --with-libgmp-prefix=DIR.])]) + fi + ;; esac - - if test -z "$GMP_H"; then - AC_DEFINE([HAVE_GMP], 1, - [Define to 1 if you have the GMP library instead of just the - mini-gmp replacement.]) + if test $HAVE_LIBGMP = yes; then + GMP_H= + else + GMP_H=gmp.h fi - - AC_SUBST([LIB_GMP]) AC_SUBST([GMP_H]) AM_CONDITIONAL([GL_GENERATE_GMP_H], [test -n "$GMP_H"]) ]) |