build: switch to ordinary auto* tools system.

[cln.git] / m4 / gmp.m4

diff --git a/m4/gmp.m4 b/m4/gmp.m4
index 4ce5c35096b1c622a12a71fc1ec911ea1f485311..205101e26589bf31316375491b31926644f55465 100644 (file)
--- a/m4/gmp.m4
+++ b/m4/gmp.m4
@@ -1,5 +1,5 @@
 dnl -*- Autoconf -*-
-dnl Copyright (C) 1993-2003 Free Software Foundation, Inc.
+dnl Copyright (C) 1993-2008 Free Software Foundation, Inc.
 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
@@ -11,7 +11,7 @@ dnl From Richard B. Kreckel.
 AC_PREREQ(2.13)
 
 dnl Is the gmp header file new enough? (should be implemented with an argument)
-AC_DEFUN(CL_GMP_H_VERSION,
+AC_DEFUN([CL_GMP_H_VERSION],
 [AC_CACHE_CHECK([for recent enough gmp.h], cl_cv_new_gmp_h, [
   AC_TRY_CPP([#include <gmp.h>
 #if !defined(__GNU_MP_VERSION) || (__GNU_MP_VERSION < 3)
@@ -21,19 +21,23 @@ cl_cv_new_gmp_h="yes", cl_cv_new_gmp_h="no")
 ])])dnl
 
 dnl Does libgmp provide some functionality introduced in version 3.0?
-AC_DEFUN(CL_GMP_CHECK,
+AC_DEFUN([CL_GMP_CHECK],
 [AC_CACHE_CHECK([for working libgmp], cl_cv_new_libgmp, [
     SAVELIBS=$LIBS
     LIBS="$LIBS -lgmp"
     AC_TRY_LINK([#include <gmp.h>],[mpn_divexact_by3(0,0,0)],
-cl_cv_new_libgmp="yes", cl_cv_new_libgmp="no"; LIBS=$SAVELIBS)
-])])
+cl_cv_new_libgmp="yes", cl_cv_new_libgmp="no")
+    LIBS=$SAVELIBS])
+    if test "$cl_cv_new_libgmp" = yes; then
+      LIBS="$LIBS -lgmp"
+    fi
+])
 
 dnl What is sizeof(mp_limb_t)?  (It has to match sizeof(uintD) later.)
-AC_DEFUN(CL_GMP_SET_UINTD,
+AC_DEFUN([CL_GMP_SET_UINTD],
 [AC_CACHE_CHECK([how large gmp demands uintD to be], cl_cv_gmp_set_uintd, [
-    AC_TRY_RUN([#include <stdio.h>
-#include <gmp.h>
+    AC_TRY_RUN([#include <gmp.h>
+#include <stdio.h>
 int main() {
     FILE *f=fopen("conftestval", "w");
     if (!f) return(255);
@@ -60,3 +64,62 @@ int main() {
 ])
 AC_DEFINE_UNQUOTED($cl_gmp_demands)
 ])
+
+dnl Whether or not to use GMP. Sets CL_USE_GMP.
+dnl Also sets CPPFLAGS, LDFLAGS if --with-gmp=DIR was specified.
+AC_DEFUN([CL_LIBGMP],
+[AC_ARG_WITH(gmp, AS_HELP_STRING([--with-gmp@<:@=DIR@:>@],
+  [use external low-level functions from GNU MP (installed in prefix DIR) @<:@default=yes@:>@.]),[
+    with_gmp="$withval"
+  ],
+  with_gmp="yes")
+case $with_gmp in
+  yes)
+    dnl --with-gmp
+    CL_GMP_H_VERSION
+    if test "$cl_cv_new_gmp_h" = yes; then
+      CL_GMP_CHECK
+      if test "$cl_cv_new_libgmp" = yes; then
+        CL_GMP_SET_UINTD
+        AC_DEFINE(CL_USE_GMP, 1, [Define if GNU MP library is available])
+      else
+        AC_MSG_WARN([The GNU MP library is too old to be used.])
+      fi
+    else
+      AC_MSG_WARN([The header file <gmp.h> is too old to be used.])
+    fi
+  ;;
+  no)
+    dnl --without-gmp
+  ;;
+  *)
+    dnl --with-gmp=DIR
+    case $withval in
+      [[\\/$]]* | ?:[[\\/]]* )
+      ;;
+      *) AC_MSG_ERROR([expected an absolute directory name for --with-gmp: $withval])
+      ;;
+    esac
+    saved_CPPFLAGS="$CPPFLAGS"
+    CPPFLAGS="$CPPFLAGS -I${withval}/include"
+    saved_LDFLAGS="$LDFLAGS"
+    LDFLAGS="$LDFLAGS -L${withval}/lib"
+    CL_GMP_H_VERSION
+    if test "$cl_cv_new_gmp_h" = yes; then
+      CL_GMP_CHECK
+      if test "$cl_cv_new_libgmp" = yes; then
+        CL_GMP_SET_UINTD
+        AC_DEFINE(CL_USE_GMP)
+      else
+        AC_MSG_WARN([The GNU MP library is too old to be used.])
+        CPPFLAGS="$saved_CPPFLAGS"
+        LDFLAGS="$saved_LDFLAGS"
+      fi
+    else
+      AC_MSG_WARN([The header file <gmp.h> is too old to be used.])
+      CPPFLAGS="$saved_CPPFLAGS"
+      LDFLAGS="$saved_LDFLAGS"
+    fi
+  ;;
+esac
+])