From d6fed337112380695f8fabe8dc08b9b0dd05d7a6 Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Wed, 16 Aug 2006 06:04:36 +0000
Subject: r17565: expand the test for negative enum values, systems like Tru64
 truncate the value to INT_MAX... So a AC_TRY_RUN test is needed here

metze
(This used to be commit dc0e22a52e3488a4cb9f17138389885183e90c34)
---
 source4/build/m4/check_cc.m4 | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/source4/build/m4/check_cc.m4 b/source4/build/m4/check_cc.m4
index 4850ec5504..c15da03637 100644
--- a/source4/build/m4/check_cc.m4
+++ b/source4/build/m4/check_cc.m4
@@ -86,11 +86,28 @@ fi
 
 ############################################
 # check if the compiler can handle negative enum values
+# and don't truncate the values to INT_MAX
+# a runtime test is needed here
 AC_CACHE_CHECK([that the C compiler understands negative enum values],SMB_BUILD_CC_NEGATIVE_ENUM_VALUES, [
-    AC_TRY_COMPILE([
-#include <stdio.h>],
+    AC_TRY_RUN(
 [
+	#include <stdio.h>
 	enum negative_values { NEGATIVE_VALUE = 0xFFFFFFFF };
+	int main(void) {
+		enum negative_values v1 = NEGATIVE_VALUE;
+		unsigned v2 = NEGATIVE_VALUE;
+
+		if (v1 != 0xFFFFFFFF) {
+			printf("%u != 0xFFFFFFFF\n", v1);
+			return 1;
+		}
+		if (v2 != 0xFFFFFFFF) {
+			printf("%u != 0xFFFFFFFF\n", v2);
+			return 1;
+		}
+
+		return 0;
+	}
 ],
 	SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=yes,SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=no)])
 if test x"$SMB_BUILD_CC_NEGATIVE_ENUM_VALUES" != x"yes"; then
-- 
cgit