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| author | Ted Kremenek <kremenek@apple.com> | 2011-10-12 19:46:30 +0000 |
|---|---|---|
| committer | Ted Kremenek <kremenek@apple.com> | 2011-10-12 19:46:30 +0000 |
| commit | a35d67dfd927191a16cf24931981d79901938381 (patch) | |
| tree | fb0f9889925fcce82c4e76fb0bd5cd1e6211a72f /clang/docs | |
| parent | 205d0445529eb985a1485ff8e2a18908f75f3bb1 (diff) | |
| download | bcm5719-llvm-a35d67dfd927191a16cf24931981d79901938381.tar.gz bcm5719-llvm-a35d67dfd927191a16cf24931981d79901938381.zip | |
Implement built-in macro '__has_warning', which allows one to query if a warning flag is valid. Fixes <rdar://problem/10263428>.
llvm-svn: 141802
Diffstat (limited to 'clang/docs')
| -rw-r--r-- | clang/docs/LanguageExtensions.html | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/clang/docs/LanguageExtensions.html b/clang/docs/LanguageExtensions.html index d8a57df4865..ef57a659c4d 100644 --- a/clang/docs/LanguageExtensions.html +++ b/clang/docs/LanguageExtensions.html @@ -300,6 +300,23 @@ and will issue a warning if used in the top-level compilation file. A warning will also be issued if an absolute path is used in the file argument.</p> + +<!-- ======================================================================= --> +<h3><a name="__has_warning">__has_warning</a></h3> +<!-- ======================================================================= --> + +<p>This function-like macro takes a string literal that represents a command + line option for a warning and returns true if that is a valid warning + option.</p> + +<blockquote> +<pre> +#if __has_warning("-Wformat") +... +#endif +</pre> +</blockquote> + <!-- ======================================================================= --> <h2 id="builtinmacros">Builtin Macros</h2> <!-- ======================================================================= --> |
