base-builder: introspector: disable dead code optimizations #13315
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Despite -O0 these optimizations still happen. This is particularly important for OFG runs where we run on new projects as they will be based on an empty fuzzing harness, meaning a lot of the code is potentially affected. Less so on existing projects where the optimizations are less impactful.
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/gcbrun trial_build.py all --sanitizer introspector --fuzzing-engine libfuzzer |
oliverchang
approved these changes
May 15, 2025
| @@ -82,7 +82,7 @@ ENV SANITIZER_FLAGS_memory "-fsanitize=memory -fsanitize-memory-track-origins" | |||
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| ENV SANITIZER_FLAGS_thread "-fsanitize=thread" | |||
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| ENV SANITIZER_FLAGS_introspector "-O0 -flto -fno-inline-functions -fuse-ld=gold -Wno-unused-command-line-argument" | |||
| ENV SANITIZER_FLAGS_introspector "-O0 -flto -fno-inline-functions -fuse-ld=gold -Wno-unused-command-line-argument -Wl,--mllvm,-compute-dead=false -disable-globaldce" | |||
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are there any implications on speed or resulting database size?
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Despite -O0 these optimizations still happen. This is particularly important for OFG runs where we run on new projects as they will be based on an empty fuzzing harness, meaning a lot of the code is potentially affected. Less so on existing projects where the optimizations are less impactful.