From 62b4dcf17e2b7d73f728b13109520a76ac8935a6 Mon Sep 17 00:00:00 2001
From: Kevin Ryde <user42@zip.com.au>
Date: Wed, 20 Jun 2001 00:08:45 +0200
Subject: More of: 	* acinclude.m4, configure.in (GMP_C_ATTRIBUTE_MALLOC):
 New macro.

---
 acinclude.m4 | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

(limited to 'acinclude.m4')

diff --git a/acinclude.m4 b/acinclude.m4
index f83bfb731..809f0f7e1 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1352,12 +1352,28 @@ fi
 
 dnl  GMP_C_ATTRIBUTE_MALLOC
 dnl  ----------------------
+dnl  gcc 2.95.x accepts __attribute__ ((malloc)) but with a warning that
+dnl  it's ignored.  Pretend it doesn't exist in this case, to avoid that
+dnl  warning.
 
 AC_DEFUN(GMP_C_ATTRIBUTE_MALLOC,
 [AC_CACHE_CHECK([whether gcc __attribute__ ((malloc)) works],
                 gmp_cv_c_attribute_malloc,
-[AC_TRY_COMPILE([void *foo (int x) __attribute__ ((malloc));], ,
-  gmp_cv_c_attribute_malloc=yes, gmp_cv_c_attribute_malloc=no)
+[cat >conftest.c <<EOF
+void *foo (int x) __attribute__ ((malloc));
+EOF
+gmp_compile="$CC $CFLAGS $CPPFLAGS -c conftest.c >conftest.out 2>&1"
+if AC_TRY_EVAL(gmp_compile); then
+  if grep "attribute directive ignored" conftest.out >/dev/null; then
+    gmp_cv_c_attribute_malloc=no
+  else
+    gmp_cv_c_attribute_malloc=yes
+  fi
+else
+  gmp_cv_c_attribute_malloc=no
+fi
+cat conftest.out >&AC_FD_CC
+rm -f conftest*
 ])
 if test $gmp_cv_c_attribute_malloc = yes; then
   AC_DEFINE(HAVE_ATTRIBUTE_MALLOC, 1,
-- 
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