Fangrui Song eecb22d8e1 [SanitizerBinaryMetadata] Use weak __start_/__stop_ instead of dummy empty section ... D130887 uses a dummy empty section `sanmd_covered` (with the SHF_GNU_RETAIN flag on ELF) to prevent `undefined symbol: __start_sanmd_covered` if all `sanmd_covered` are discarded by `ld --gc-sections` (in `-z start-stop-gc` mode). The dummy `sanmd_covered` does not have the SHF_LINK_ORDER flag, so mixing it with SHF_LINK_ORDER `sanmd_covered` causes an issue to GNU ld<2.36 (https://sourceware.org/bugzilla/show_bug.cgi?id=26256). Similar to D98903 for SanitizerCoverage, let's make encapsulation symbols undefined weak[1]. This additionally avoids size cost due to the dummy section and symbol. [1]: https://maskray.me/blog/2021-01-31-metadata-sections-comdat-and-shf-link-order Reviewed By: melver Differential Revision: https://reviews.llvm.org/D139276		2022-12-04 15:06:34 -08:00
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atomics.ll	[SanitizerBinaryMetadata] Use weak __start_/__stop_ instead of dummy empty section	2022-12-04 15:06:34 -08:00