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clang converts keywords to identifiers for compatibility with
various system headers such as GNU libc.<br>
<br>
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.<br>
<br>
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.<br>
<br>
Some examples:<br>
<br>
<code>warning: keyword '__is_pod' will be treated as an identifier
for the remainder of the translation unit [-Wkeyword-compat]</code><code><br>
</code><code>struct __is_pod</code><code><br>
</code><code><br>
</code><code>warning: keyword '__uptr' will be treated as an
identifier here [-Wkeyword-compat]</code><code><br>
</code><code>union w *__uptr;</code><br>
<br>
Alp.<br>
<br>
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