[PATCH 2/5] RFC: Provide a NORETURN_ATTRIBUTE macro similar to PRINTF_ATTRIBUTE

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+From: Justus Winter <4winter@informatik.uni-hamburg.de>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH 2/5] RFC: Provide a NORETURN_ATTRIBUTE macro similar to\r
+       PRINTF_ATTRIBUTE\r
+Date: Mon, 24 Sep 2012 12:31:54 +0200\r
+Message-Id:\r
+ <1348482717-10340-3-git-send-email-4winter@informatik.uni-hamburg.de>\r
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+References: <20120922161256.GE26662@mit.edu>\r
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+\r
+This attribute is understood by gcc since version 2.5. clang provides\r
+support for testing for function attributes using __has_attribute. For\r
+other compilers this macro evaluates to the empty string.\r
+\r
+Note: This is work in progress, please don't merge this patch. The\r
+question that needs to be discussed is where this kind of macro should\r
+be defined.\r
+\r
+Signed-off-by: Justus Winter <4winter@informatik.uni-hamburg.de>\r
+---\r
+ util/error_util.h |   16 ++++++++++++++++\r
+ 1 file changed, 16 insertions(+)\r
+\r
+diff --git a/util/error_util.h b/util/error_util.h\r
+index 1b11047..27e119f 100644\r
+--- a/util/error_util.h\r
++++ b/util/error_util.h\r
+@@ -31,6 +31,22 @@\r
+ #define __has_attribute(x) 0\r
+ #endif\r
+ \r
++/* Provide a NORETURN_ATTRIBUTE macro similar to PRINTF_ATTRIBUTE from\r
++ * talloc.\r
++ *\r
++ * This attribute is understood by gcc since version 2.5. clang\r
++ * provides support for testing for function attributes.\r
++ */\r
++#ifndef NORETURN_ATTRIBUTE\r
++#if (__GNUC__ >= 3 ||                         \\r
++     (__GNUC__ == 2 && __GNUC_MINOR__ >= 5) ||        \\r
++     __has_attribute (noreturn))\r
++#define NORETURN_ATTRIBUTE __attribute__ ((noreturn))\r
++#else\r
++#define NORETURN_ATTRIBUTE\r
++#endif\r
++#endif\r
++\r
+ /* There's no point in continuing when we've detected that we've done\r
+  * something wrong internally (as opposed to the user passing in a\r
+  * bogus value).\r
+-- \r
+1.7.10.4\r
+\r