Bob Wilson 73a4deb33d Change __extension__ to disable only diagnostics controlled by -pedantic. ...

This changes clang to match GCC's behavior for __extension__, which temporarily
disables the -pedantic flag.  Warnings that are enabled without -pedantic
are not affected.  Besides the general goodness of matching GCC's precedent,
my motivation for this is that macros in the arm_neon.h header need to use
__extension__ to avoid pedantic complaints about their use of statement
expressions, yet we still want to warn about incompatible pointer arguments
for those macros.

llvm-svn: 141804

2011-10-12 19:55:31 +00:00

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