[PATCH] D41723: Introduce the "retpoline" x86 mitigation technique for variant #2 of the speculative execution vulnerabilities disclosed today, specifically identified by CVE-2017-5715, "Branch Target Injection", and is one of the two halves to Spectre..

[Roger via Phabricator via llvm-commits]

royger added a comment.

I still think the interface should be fixed, so that later on when lfence (or other thunks) is added clang doesn't end up with:

-mretpoline_external_thunk and -mlfence_external_thunk

Which doesn't make sense. IMHO the interface should be something like:

-mindirect-thunk={retpoline,lfence,external,...}

Or similar, ie: a single option that allows the user to select the thunk to use.

gcc is using such interface:

https://gcc.gnu.org/ml/gcc-patches/2018-01/msg01041.html


Repository:
  rL LLVM

https://reviews.llvm.org/D41723