coreutils-8.25HEADcoreutils-8.25master

1 files changed, 48 insertions, 0 deletions

diff --git a/m4/gmp.m4 b/m4/gmp.m4
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+# Tests for GNU GMP (or any compatible replacement).
+
+dnl Copyright (C) 2008-2016 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
+])