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[Clang] Clang erroneously allows if constexpr in C23 mode #112587

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Sirraide opened this issue Oct 16, 2024 · 4 comments
Open

[Clang] Clang erroneously allows if constexpr in C23 mode #112587

Sirraide opened this issue Oct 16, 2024 · 4 comments
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@Fznamznon
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accepts-invalid c23 clang:frontend Language frontend issues, e.g. anything involving "Sema" confirmed Verified by a second party regression:19 Regression in 19 release

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@Sirraide
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See https://godbolt.org/z/E8PEzzfP3. According to @AaronBallman, this isn’t intentional, so we should probably disallow this.
@Sirraide Sirraide added c23 clang:frontend Language frontend issues, e.g. anything involving "Sema" accepts-invalid labels Oct 16, 2024
@llvmbot
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llvmbot commented Oct 16, 2024

@llvm/issue-subscribers-clang-frontend

Author: None (Sirraide)

See https://godbolt.org/z/E8PEzzfP3. According to @AaronBallman, this isn’t intentional, so we should probably disallow this.

@AaronBallman AaronBallman added the confirmed Verified by a second party label Oct 16, 2024
@AaronBallman
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It would be really nice if we could get a fix for this in to Clang 19.x

@shafik shafik added the regression:19 Regression in 19 release label Oct 16, 2024
@Fznamznon
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I don't think this is a regression since clang 18 doesn't support c23 constexpr.

@shafik
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shafik commented Oct 17, 2024

I don't think this is a regression since clang 18 doesn't support c23 constexpr.

I guess I look at it as if constexpr is now erroneously enabled in C whereas previously it was a hard error.

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accepts-invalid c23 clang:frontend Language frontend issues, e.g. anything involving "Sema" confirmed Verified by a second party regression:19 Regression in 19 release
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