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GCC: cc1

cc1 is also referred to as the compiler proper.
cc1 preprocesses a C translation unit and compiles it into assembly code. The assembly code is converted into an object file with the assembler.
Earlier versions of cc1 used /usr/bin/cpp for the preprocessing stage.
The installation location of cc1 can be determined with 
$ gcc -print-file-name=cc1
/usr/lib/gcc/x86_64-linux-gnu/10/cc1

See also

GCC

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