How to disable optimization in LLVM

Question

I am compiling code with clang with -O4 optimization. However, I want to disable feature inlining. I have my own LLVM pass that injects some code into the generated code. After my walk, I want to enable feature nesting. How can i do this.

Answer 1

You can use opt, which says it can run passes in any order.

 clang -c main.cpp -O0 -emit-llvm | opt -load yourplugin -yourpass -inline 

Answer 2

If you hack clang, you can change the order in the file clang/lib/CodeGen/BackendUtil.cpp . You must insert your pass before embedding in the CreatePasses() method.