[all-commits] [llvm/llvm-project] da31b6: [Coverage] Suppress covmap and profdata for system...

[NAKAMURA Takumi via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: da31b684a57cdc77ad4274fd7d8b47ee27dea6c6
      https://github.com/llvm/llvm-project/commit/da31b684a57cdc77ad4274fd7d8b47ee27dea6c6
  Author: NAKAMURA Takumi <geek4civic at gmail.com>
  Date:   2024-07-10 (Wed, 10 Jul 2024)

  Changed paths:
    M clang/lib/CodeGen/CodeGenModule.cpp
    M clang/lib/CodeGen/CodeGenPGO.cpp
    M clang/test/CoverageMapping/system_macro.cpp

  Log Message:
  -----------
  [Coverage] Suppress covmap and profdata for system headers. (#97952)

With `system-headers-coverage=false`, functions defined in system
headers were not instrumented but corresponding covmaps were emitted. It
caused wasting covmap and profraw.

This change improves:

- Reduce object size (due to reduced covmap)
- Reduce size of profraw (uninstrumented system headers occupied
counters)
- Smarter view of coverage report. Stubs of uninstrumented system
headers will be no longer seen.



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