[cfe-dev] Add directives-only preprocessing

[Reid Kleckner via cfe-dev]

Clang already has -frewrite-includes for this purpose.

On Wed, May 17, 2017 at 7:30 AM, Matthew Larionov via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> 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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>
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