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[LLVM 17][libc++] Cherry-pick the fix for std::expected UB related to the has-value flag #70708

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ldionne opened this issue Oct 30, 2023 · 3 comments · Fixed by llvm/llvm-project-release-prs#762
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[LLVM 17][libc++] Cherry-pick the fix for std::expected UB related to the has-value flag #70708

ldionne opened this issue Oct 30, 2023 · 3 comments · Fixed by llvm/llvm-project-release-prs#762
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libc++ libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi. release:backport release:merged
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LLVM 17.0.X Release

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@ldionne
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ldionne commented Oct 30, 2023

We should cherry-pick this PR (#68733) which fixed this issue (#68552). Doing this is not an ABI break (unlike the follow-up #69673 which is an ABI break, and we're still undecided about this one).

I think it makes sense to make the present fix regardless of what we end up doing for the tail-padding issue (the ABI breaking one).
@ldionne ldionne added this to the LLVM 17.0.X Release milestone Oct 30, 2023
@ldionne ldionne added the libc++ libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi. label Oct 30, 2023
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ldionne commented Oct 30, 2023

/branch ldionne/review/cherry-pick-has-value-fix-LLVM-17

@DanAlbert DanAlbert mentioned this issue Oct 30, 2023
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@nikic
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nikic commented Oct 31, 2023

/branch ldionne/llvm-project/review/cherry-pick-has-value-fix-LLVM-17

@llvmbot llvmbot mentioned this issue Oct 31, 2023
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llvmbot commented Oct 31, 2023

/pull-request llvm/llvm-project-release-prs#762

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libc++ libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi. release:backport release:merged
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LLVM Release Status
Status: Done
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LLVM 17.0.X Release
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PR for llvm/llvm-project#70708 llvm/llvm-project-release-prs
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@nikic @ldionne @EugeneZelenko @llvmbot