[PATCH] D102453: [CMake][ELF] Add -fno-semantic-interposition for GCC

[Evangelos Foutras via Phabricator via llvm-commits]

foutrelis added a comment.

In D102453#2761170 <https://reviews.llvm.org/D102453#2761170>, @MaskRay wrote:

> For global variables, I have a feature request https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100483

If that's implemented in GCC then this change here to build with -fno-semantic-interposition would mean that the test failures seen in D102090 <https://reviews.llvm.org/D102090> would resurface. Perhaps it's not worth the risk compared to waiting for something like -fno-semantic-interposition-function (or -fno-semantic-function-interposition or -fno-semantic-interposition=function).

As for LD_PRELOAD, it's used by fakeroot during package creation in Arch Linux, and possibly elsewhere too. Like you said, there's likely a significant amount of work required to enable -fno-semantic-interposition by default. Switching to PIE by default was pretty uneventful as far as I recall (aside from having to patch clang to get PIE by default).


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  https://reviews.llvm.org/D102453/new/

https://reviews.llvm.org/D102453