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From: Rich Felker <dalias@libc.org>
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Subject: Re: Support for .S files
Date: Fri, 25 Sep 2015 14:56:56 -0400
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On Fri, Sep 25, 2015 at 01:52:26PM -0500, Sidney Manning wrote:
> Clang and gcc do not invoke the preprocessor on files with a lowercase .s
> suffix.
> 
> The following addition would permit uppercase .S files.

The intention was to avoid using the preprocessor in asm and having it
become #ifdef hell. This could be revisited (especially now as part of
the arch deduplication/refactoring) but there should first be some
discussion of the motivation (what you want to achieve with it).

Rich