[PATCH 1/5] RFC: Provide a __has_attribute compatibility macro

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+From: Justus Winter <4winter@informatik.uni-hamburg.de>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH 1/5] RFC: Provide a __has_attribute compatibility macro\r
+Date: Mon, 24 Sep 2012 12:31:53 +0200\r
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+References: <20120922161256.GE26662@mit.edu>\r
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+\r
+__has_attribute is defined by clang and tests whether a given function\r
+attribute is supported by clang.\r
+\r
+Add a compatibility macro for other compilers.\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 |    8 ++++++++\r
+ 1 file changed, 8 insertions(+)\r
+\r
+diff --git a/util/error_util.h b/util/error_util.h\r
+index bb15822..1b11047 100644\r
+--- a/util/error_util.h\r
++++ b/util/error_util.h\r
+@@ -23,6 +23,14 @@\r
+ \r
+ #include <talloc.h>\r
+ \r
++/* clang provides this macro to test for support for function\r
++ * attributes. If it isn't defined, this provides a compatibility\r
++ * macro for other compilers.\r
++ */\r
++#ifndef __has_attribute\r
++#define __has_attribute(x) 0\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