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In a `-DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD=X86 -DLLVM_LINK_LLVM_DYLIB=on -DCLANG_LINK_CLANG_DYLIB=on` build, libLLVM-13git.so is 2% smaller and libclang-cpp.so is 1% smaller (on top of -Wl,-Bsymbolic-functions). There may be some small performance improvement as well because GCC -fPIC suppresses interprocedural optimizations for non-inline definitions by default. Note: we cannot add -fno-semantic-interposition for Clang<13. Clang<13's implementation additionally optimizes global variables, which is incompatible with unfortunate ELF -fno-pic default: direct access relocations for external data. If the executable has a -fno-pic object file referencing a global variable declared in a public header, the direct access relocation will cause a copy relocation. The executable and libLLVM.so/libclang-cpp.so will disagree on the address. Reviewed By: phosek Differential Revision: https://reviews.llvm.org/D102453
See docs/CMake.html for instructions on how to build LLVM with CMake.