[PATCH] D100150: [Sanitizers] Add a flag -f[no-]sanitize-merge-traps

[Reid Kleckner via Phabricator via cfe-commits]

rnk created this revision.
rnk added reviewers: pcc, phosek, rsmith, zequanwu.
Herald added subscribers: jansvoboda11, dexonsmith, dang.
rnk requested review of this revision.
Herald added a project: clang.

Without this flag, enabling optimizations causes clang to emit a single
ubsantrap for every check failure of a particular kind. Adding this flag
allows the user to control this behavior separately, so they can choose
to have increased code size in exchange for more debuggable code.

A Chrome developer requested this feature here:
https://crbug.com/1185451

I made this change in such a way that it doesn't litter the cc1 line
with redundant flags: if the user does not pass the positive or negative
version if this flag, it is not forwarded to the cc1 invocation.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D100150

Files:
  clang/include/clang/Basic/CodeGenOptions.def
  clang/include/clang/Driver/Options.td
  clang/include/clang/Driver/SanitizerArgs.h
  clang/lib/CodeGen/CGExpr.cpp
  clang/lib/Driver/SanitizerArgs.cpp
  clang/lib/Frontend/CompilerInvocation.cpp
  clang/test/CodeGen/catch-undef-behavior.c
  clang/test/CodeGen/cfi-nomerge.c
  clang/test/CodeGen/trapv-nomerge.c
  clang/test/Driver/sanitize-merge-traps.c

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