[cfe-dev] Add directives-only preprocessing

[Matthew Larionov via cfe-dev]

Hello!

When using clang with distributed build systems various errors may occur
due to clang compiles
source code differently if it was previously preprocessed(see [1] for
example). Is it an intentional behaviour?

As a solution for this kind of errors gcc provides "-fdirectives-only"
flag([2]) to preprocess only directives, but prevent macro expansions
outside of directives, which also speedups preprocessing
on local machine. Are there any plans to support this kind of feature? Are
patches welcome?

1. http://petereisentraut.blogspot.ru/2011/09/ccache-and-clang-part-2.html
2. https://gcc.gnu.org/ml/gcc-patches/2007-02/msg01125.html
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