How is clang able to steer C/C++ code optimization?

Question

I was told that clang is a driver that works like gcc to do preprocessing, compilation and linkage work. During the compilation and linkage, as far as I know, it\'s actually llv

Answer 1

It's not exactly like GCC, so don't spend too much time trying to match the two precisely.

The LLVM compiler is a compiler for one specific language, LLVM. What Clang does is compile C++ code to LLVM, without optimizations. Clang can then invoke the LLVM compiler to compile that LLVM code to optimized assembly.