svn commit: samba r17565 - in branches/SAMBA_4_0/source/build/m4: .

[metze at samba.org]

Author: metze
Date: 2006-08-16 06:04:36 +0000 (Wed, 16 Aug 2006)
New Revision: 17565

WebSVN: http://websvn.samba.org/cgi-bin/viewcvs.cgi?view=rev&root=samba&rev=17565

Log:
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
Modified:
   branches/SAMBA_4_0/source/build/m4/check_cc.m4


Changeset:
Modified: branches/SAMBA_4_0/source/build/m4/check_cc.m4
===================================================================
--- branches/SAMBA_4_0/source/build/m4/check_cc.m4	2006-08-16 05:59:24 UTC (rev 17564)
+++ branches/SAMBA_4_0/source/build/m4/check_cc.m4	2006-08-16 06:04:36 UTC (rev 17565)
@@ -86,11 +86,28 @@
 
 ############################################
 # 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