[DRAFT] Make IsRelocatable use the Clang builtin __is_trivially_relocatable(T) #2159
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Clang 18's `__is_trivially_relocatable(T)` isn't yet compatible with Folly's use of the term; false negatives are fine, but Clang dangerously gives false positives. However, after llvm/llvm-project#84621 , the builtin will no longer give any (known) false positives, which means it will be safe for Folly to start using the builtin as of Clang 19+.
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Suggest closing this one in favor of #2216. |
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Clang 18's
__is_trivially_relocatable(T)isn't yet compatible with Folly's use of the term; false negatives are fine, but Clang dangerously gives false positives. However, after llvm/llvm-project#84621, the builtin will no longer give any (known) false positives, which means it will be safe for Folly to start using the builtin as of Clang 19+.I'm posting this here hoping to kickstart a Folly discussion — "is Folly in favor of the Clang patch? would Folly indeed start using the Clang builtin, if it were long-term supported with the Folly(/Abseil/BSL/Qt/P1144/etc) semantics?"
Please do not merge this patch until llvm/llvm-project#84621 is successfully merged upstream; that patch is a prerequisite for this one.