[cfe-dev] Pre-processing assembly sources

Joerg Sonnenberger via cfe-dev cfe-dev at lists.llvm.org
Thu Aug 4 09:56:23 PDT 2016

On Fri, Jul 29, 2016 at 11:32:10AM +0100, Martin J. O'Riordan via cfe-dev wrote:
> Using the C pre-processor for maintaining assembly source files is really
> useful, but which ISO C Standard pre-processor is selected when
> pre-processing files with the extension '.S'?

Actually, it isn't exactly ISO C. The language mode is called
assembler-with-cpp and it has a bunch of explicit changes from normal
CPP rules. For example, it silently accepts certain tokenisation errors.


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