[cfe-dev] using the original file name for compiling preprocessed files ("-main-file-name"?)

[Robert Lytton]

Hi,

I would like to call clang twice, once to preprocess and second time to compile.
The second time clang is called, I would like to pass in the original file name for it to use as the ModuleID.
I tried to use:
   clang -E test.c -o tmp.i
   clang -S -x c tmp.i -o test.s    -Xclang -main-file-name -Xclang test.c   -emit-llvm

However, the ModuleID is 'tmp.i' rather than that passed in by '-main-file-name'.

Same with:
    clang -cc1 -triple x86_64-unknown-linux-gnu -x c tmp.i -o test.s  -main-file-name test.c -emit-llvm


I am trying to achieve the same affect as using "-fpreprocessed -dumpbase <file>" with llvm-gcc.
Here it seems the gcc front end fetches the file name from the first line of the preprocessed file.

Thank you.

Robert





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