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#[target_feature="±<feat>"] is not properly checked against whitelist #38900

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nagisa opened this issue Jan 7, 2017 · 3 comments
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#[target_feature="±<feat>"] is not properly checked against whitelist #38900

nagisa opened this issue Jan 7, 2017 · 3 comments
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A-SIMD Area: SIMD (Single Instruction Multiple Data) C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.

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@nagisa
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nagisa commented Jan 7, 2017

#[cfg(target_feature="abcd")] was landed with a strong requirement to have a whitelist of LLVM features that are exposed this way, mostly due to compatibility concerns with LLVM.

#[target_feature="±abcd"], however does not check against the whitelist in question and allows everything through. Seems like a potential compat footgun?
@est31
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est31 commented Jan 7, 2017

cc @BurntSushi

@BurntSushi
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It was landed to make it possible to experiment with SIMD support in Rust. I would expect this question to be resolved in the stabilization effort. (But yes, I agree, it does certainly need to be checked.)

@nagisa nagisa mentioned this issue Apr 18, 2017
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@Mark-Simulacrum Mark-Simulacrum added T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. labels Jun 23, 2017
@Mark-Simulacrum Mark-Simulacrum added the C-bug Category: This is a bug. label Jul 26, 2017
@alexcrichton alexcrichton added the A-SIMD Area: SIMD (Single Instruction Multiple Data) label Sep 25, 2017
@alexcrichton
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This was fixed for #44839

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A-SIMD Area: SIMD (Single Instruction Multiple Data) C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
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@alexcrichton @BurntSushi @nagisa @Mark-Simulacrum @est31