[PATCH] Emit an extension warning when changing system header tokens

[Alp Toker]

r196212

On 03/12/2013 01:29, Reid Kleckner wrote:
> Looks good to me.
>
>
> On Thu, Nov 28, 2013 at 4:27 AM, Alp Toker <alp at nuanti.com 
> <mailto:alp at nuanti.com>> wrote:
>
>     clang converts keywords to identifiers for compatibility with
>     various system headers such as GNU libc.
>
>     The attached patch adds an extension warning diagnostic in those
>     cases. The warning is typically ignored by default when the issue
>     is encountered in system headers, but can be enabled to aid in
>     standards conformance testing.
>
>     This also changes the __uptr keyword avoidance from r195710 to not
>     be special-cased for system headers now that a warning is in
>     place, bringing it in line with other similar workarounds in clang.
>
>     Some examples:
>
>     |warning: keyword '__is_pod' will be treated as an identifier for
>     the remainder of the translation unit [-Wkeyword-compat]||
>     ||struct __is_pod||
>     ||
>     ||warning: keyword '__uptr' will be treated as an identifier here
>     [-Wkeyword-compat]||
>     ||union w *__uptr;|
>
>     Alp.
>
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