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Repared support for warnings -Wkeyword-macro and -Wreserved-id-macro.
The warning -Wkeyword-macro now is not issued in patterns that are used
in configuration scripts:
#define inline
also for 'const', 'extern' and 'static'. If macro repalcement is identical
to macro name, the warning also is not issued:
#define volatile volatile
And finally if macro replacement is also a keyword identical to the replaced
one but decorated with leading/trailing underscores:
#define inline __inline
#define inline __inline__
#define inline _inline // in MSVC compatibility mode
Warning -Wreserved-id-macro is off by default, it could help catching
things like:
#undef __cplusplus
llvm-svn: 224512
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As discussed on the post-commit review thread for r224012, -Wkeyword-macro fires
mostly on headers trying to set up portable defines and doesn't find much bad
stuff in practice. But [macro.names]p2 does disallow defining or undefining
keywords, override and final, and alignas, so keep the warning but move it
into -pedantic.
-Wreserved-id-macro warns on
#define __need_size_t
which is more or less public api for glibc headers. Since this warning isn't
motivated by a standard, remove it.
(See also r223114 for a previous follow-up to r224012.)
llvm-svn: 224371
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#undef a keyword is generally harmless but used often in configuration scripts.
Also added tests that I forgot to include to commit in r223114.
llvm-svn: 224100
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