-fno-semantic-interposition and -Bsymbolic-functions

[nickdesaulniers]

-fno-semantic-interposition via https://reviews.llvm.org/D102453 should be enabled now by default IIUC, but IIRC -Bsymbolic-functions got reverted (cc @MaskRay ). I'm curious if these make a difference once statically linking though (#150 )

[nickdesaulniers]

I'm curious if these make a difference once statically linking though

It's not, but until we are statically linking, perhaps they are still interesting.

[MaskRay]

-Bsymbolic-functions for libLLVM-13git.so and libclang-cpp.so was re-committed in https://reviews.llvm.org/D102090.
-Bsymbolic-functions is ignored when linking an executable.

-fno-semantic-interposition was committed separately today https://reviews.llvm.org/D102453. Most files are compiled with -fPIC and they get pessimization when compiled by GCC. -fno-semantic-interposition reclaims the lost performance.

ELF platforms get the benefits automatically, no need for additional CMake options.