[cfe-commits] patch: predefines available with -undef

[Nick Lewycky]

This patch makes clang predefine some macros even when asked not to by the
-undef flag. I found real-world code which passes -undef and then tests for
these macros.

$ gcc -undef -dM -E -
#define __STDC_HOSTED__ 1
#define __STDC__ 1
$ gcc -undef -dM -E -x assembler-with-cpp -
#define __ASSEMBLER__ 1
#define __STDC_HOSTED__ 1
#define __STDC__ 1
$ gcc-4.6 -undef -dM -E -x assembler-with-cpp - -ffreestanding
#define __ASSEMBLER__ 1
#define __STDC_HOSTED__ 0
#define __STDC__ 1

Please review!

Nick
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