What does the clang -cc1 option do?

compiler-construction llvm clang
sp497 picture sp497 · Jan 24, 2012 · Viewed 10k times · Source

I'm a newbie in clang. I have read a paper about source to source transformation from cuda to opencl using clang compiler front end.

Can anyone tell me why the option -cc1 is sometimes used?

Answer

ritter picture ritter · Jan 25, 2012

The Clang compiler front-end has several additional Clang specific features which are not exposed through the GCC compatibility driver interface. The -cc1 argument indicates that the compiler front-end is to be used, and not the driver. The clang -cc1 functionality implements the core compiler functionality.

So, simply speaking. If you do not give -cc1 then you can expect the "look&feel" of standard GCC. That is the vast majority of compiler flags work just like you would expect them to work with GCC. If you pass the option "-cc1" then you get the Clang compiler flag set. Thus, there might be differences to GCC.

Hope that makes it a little clearer.

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