Finish builtins for MPFR.

1 files changed, 62 insertions, 0 deletions

diff --git a/m4/mpfr.m4 b/m4/mpfr.m4
new file mode 100644
index 00000000..11cfe106
--- /dev/null
+++ b/m4/mpfr.m4
@@ -0,0 +1,62 @@
+dnl Check for MPFR and dependencies
+dnl Copyright (C) 2004, 2005 Free Software Foundation, Inc.
+dnl
+dnl This file is free software, distributed under the terms of the GNU
+dnl General Public License.  As a special exception to the GNU General
+dnl Public License, this file may be distributed as part of a program
+dnl that contains a configuration script generated by Autoconf, under
+dnl the same distribution terms as the rest of that program.
+dnl
+dnl Defines HAVE_MPFR to 1 if a working MPFR/GMP setup is
+dnl found, and sets @LIBMPFR@ to the necessary libraries.
+
+AC_DEFUN([GNUPG_CHECK_MPFR],
+[
+  AC_ARG_WITH([mpfr],
+     AC_HELP_STRING([--with-mpfr=DIR],
+	[look for the mpfr and gmp libraries in DIR]),
+     [_do_mpfr=$withval],[_do_mpfr=yes])
+
+  if test "$_do_mpfr" != "no" ; then
+     if test -d "$withval" ; then
+        CPPFLAGS="${CPPFLAGS} -I$withval/include"
+        LDFLAGS="${LDFLAGS} -L$withval/lib"
+     fi
+
+        _mpfr_save_libs=$LIBS
+        _combo="-lmpfr -lgmp"
+        LIBS="$LIBS $_combo"
+
+        AC_MSG_CHECKING([whether mpfr via \"$_combo\" is present and usable])
+
+        AC_LINK_IFELSE([
+	AC_LANG_PROGRAM([
+#include <stdio.h>
+#include <mpfr.h>
+#include <gmp.h>
+],[
+mpfr_t p;
+mpz_t z;
+mpfr_init(p);
+mpz_init(z);
+mpfr_printf("%Rf%Zd", p, z);
+mpfr_clear(p);
+mpz_clear(z);
+])],_found_mpfr=yes,_found_mpfr=no)
+
+        AC_MSG_RESULT([$_found_mpfr])
+
+        LIBS=$_mpfr_save_libs
+
+        if test $_found_mpfr = yes ; then
+           AC_DEFINE(HAVE_MPFR,1,
+	      [Define to 1 if you have a fully functional mpfr and gmp library.])
+           AC_SUBST(LIBMPFR,$_combo)
+           break
+        fi
+
+     unset _mpfr_save_libs
+     unset _combo
+     unset _found_mpfr
+  fi
+])dnl