[clang] [clang] Implement __attribute__((format_matches)) (PR #116708)

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=?utf-8?q?Félix?= Cloutier <fcloutier at apple.com>,
=?utf-8?q?Félix?= Cloutier <fcloutier at apple.com>,
=?utf-8?q?Félix?= Cloutier <fcloutier at apple.com>,
=?utf-8?q?Félix?= Cloutier <fcloutier at apple.com>,
=?utf-8?q?Félix?= Cloutier <fcloutier at apple.com>,
=?utf-8?q?Félix?= Cloutier <fcloutier at apple.com>,
=?utf-8?q?Félix?= Cloutier <fcloutier at apple.com>,
=?utf-8?q?Félix?= Cloutier <fcloutier at apple.com>,
=?utf-8?q?Félix?= Cloutier <fcloutier at apple.com>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/116708 at github.com>


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@@ -145,6 +145,7 @@ void test_multiple_format_strings(const char *fmt1, const char *fmt2) {
         expected-warning{{passing 'os_log' format string where 'printf' format string is expected}}
 }
 
+// MARK: - 
----------------
apple-fcloutier wrote:

This is probably an Xcode-ism. Xcode interprets `// MARK: ...` and `#pragma mark ...` as a directive to add an entry to the symbol menu. "-" creates a separator. It's harmless but I can remove them if it's not customary.

https://github.com/llvm/llvm-project/pull/116708