Do you guys use LTO? I find its performance boost impressive. When I am bootstrapping clang, I compared performance of clang built with gcc (-O3, no LTO, but gcc have a better optimizer) and LLVM LTO (-O3 -flto, but LLVM optimizer is less aggressive than gcc's) and it gave my clang a 50%~100% performance boost on compiling a trivial C++11 program. Do you guys use it?
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