[all-commits] [llvm/llvm-project] adbdef: [Driver] Make -fsanitize=kcfi, function incompatible

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: adbdef6a9f39058f390ba285624b0dfb24bad7e8
      https://github.com/llvm/llvm-project/commit/adbdef6a9f39058f390ba285624b0dfb24bad7e8
  Author: Fangrui Song <i at maskray.me>
  Date:   2023-04-19 (Wed, 19 Apr 2023)

  Changed paths:
    M clang/lib/Driver/SanitizerArgs.cpp
    M clang/test/Driver/fsanitize.c

  Log Message:
  -----------
  [Driver] Make -fsanitize=kcfi,function incompatible

A -fsanitize=kcfi instrumented function has a special instruction/data
before the function entry at a fixed offset.
A -fsanitize=function instrumented function has special instruction/data
after the function entry at a fixed offset (may change to *before* in D148665).

The two instrumentations are not intended to be used together and will become
incompatible after D148665.

Reviewed By: samitolvanen

Differential Revision: https://reviews.llvm.org/D148671