MaskRay added a comment. In D96838#2578073 <https://reviews.llvm.org/D96838#2578073>, @rjmccall wrote:
> GCC 11 hasn't been released yet, so can we still engage with GCC about the > semantics of this attribute? This is a very low-level attribute, and I don't > understand why it was made separate instead of just having `used` add the > appropriate section flag on targets that support it. GCC did overload `used` with the linker garbage collection semantics. Then after discussions (e.g. https://gcc.gnu.org/pipermail/gcc-patches/2021-February/565478.html) they decided to pick the earliest suggestion: add `retain`. This makes sense to me: `used` can emit a function which is only used by inline assembly, but the user intention can still be that the whole thing can be GCable. IIUC macOS's always enabled `.subsections_via_symbols` means always -ffunction-sections/-fdata-sections, so there is no GC preciseness concern. However, the current Windows behavior (`.drectve` include a linker option to force retaining the whole section) can unnecessarily retain the full section. Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D96838/new/ https://reviews.llvm.org/D96838 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
