[cfe-dev] Applying custom filters after preprocessing (and compile-time sprintf optimization)

[Kazuho Oku]

Hi,

Recently I have started writing a preprocessor that wraps the C
preprocessor for optimizing calls to sprintf, since it is the one of the
bottlenecks of my application.
https://github.com/kazuho/qrintf

For GCC, it was easy for me to override the default C preprocessor, by
using its `-no-integrated-cpp` and `-wrapper` options (how I have done it
can be found in the `qrinf-gcc` and `qrintf-gcc-wrapper` files included in
the above repository).

However I have so far been unable to find a similar command-line option for
Clang.  Is there any way to post-process the output of the preprocessor in
Clang?  Or do I need to modify the source code of Clang itself?

Thank you in advance.

PS. BTW it would be great if compile-time optimization of sprintf goes into
Clang.  Is there any chance of such possibility?

-- 
Kazuho Oku
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