From 41af9a7757978336b73199f52e4b0eb4d7ca93d6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niels=20M=C3=B6ller?= <nisse@lysator.liu.se>
Date: Thu, 21 Nov 2002 23:21:48 +0100
Subject: [PATCH] Check for gcc:s __attribute__.
Rev: src/nettle/configure.ac:1.15
---
configure.ac | 37 ++++++++++++++++++++++++++++++++++++-
1 file changed, 36 insertions(+), 1 deletion(-)
diff --git a/configure.ac b/configure.ac
index 5e539e1b..712ede4b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,4 @@
dnl -*- mode: shell-script; sh-indentation: 2; -*-
-dnl $Id$
dnl Process this file with autoconf to produce a configure script.
@@ -130,6 +129,42 @@ AC_C_BIGENDIAN
AC_REPLACE_FUNCS(memxor)
+# Check for gcc's __attribute__ construction
+AC_CACHE_CHECK(for __attribute__,
+ lsh_cv_c_attribute,
+[ AC_TRY_COMPILE([
+#include <stdlib.h>
+],
+[
+static void foo(void) __attribute__ ((noreturn));
+
+static void __attribute__ ((noreturn))
+foo(void)
+{
+ exit(1);
+}
+],
+lsh_cv_c_attribute=yes,
+lsh_cv_c_attribute=no)])
+
+AH_TEMPLATE([HAVE_GCC_ATTRIBUTE],
+ [Define if the compiler understands __attribute__])
+if test "x$lsh_cv_c_attribute" = "xyes"; then
+ AC_DEFINE(HAVE_GCC_ATTRIBUTE)
+fi
+
+AH_BOTTOM(
+[#if __GNUC__ && HAVE_GCC_ATTRIBUTE
+# define NORETURN __attribute__ ((__noreturn__))
+# define PRINTF_STYLE(f, a) __attribute__ ((__format__ (__printf__, f, a)))
+# define UNUSED __attribute__ ((__unused__))
+#else
+# define NORETURN
+# define PRINTF_STYLE(f, a)
+# define UNUSED
+#endif
+])
+
# Checks for libraries
AC_CHECK_LIB(gmp, __gmpz_getlimbn,,
[AC_MSG_WARN(
--
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