Avoid leaking LFS flags to reverse dependencies#1730
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Follow up of google#1725. `defines` propagates to reverse dependencies, while `local_defines` don't. If we use `defines` then there's risk of ODR violation: Suppose a user have a cc_library foo that depends on bar and benchmark: cc_library(name = "foo", deps = [":bar", "@com_github_google_benchmark//:benchmark"]) And bar has a class that has LFS-dependant ABI: cc_library(name = "foo") class Bar { off_t member; }; Bar would be compiled without LFS, but linked to foo when assuming LFS is enabled. So we limit LFS to within the library only. benchmark does not have LFS dependant public ABIs so it should be fine.
dmah42
approved these changes
Jan 5, 2024
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great spot. thank you. |
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Follow up of #1725.
definespropagates to reverse dependencies, whilelocal_definesdon't. If we usedefinesthen there's risk of ODR violation:Suppose a user have a cc_library foo that depends on bar and benchmark:
And bar has a class that has LFS-dependant ABI:
Bar would be compiled without LFS, but linked to foo when assuming LFS is enabled.
So we limit LFS to within the library only. benchmark does not have LFS dependant public ABIs so it should be fine.