add options to use optimized and mangled compiler builtins #78472
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r? @cramertj (rust_highfive has picked a reviewer for you, use r? to override) |
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I guess this is via -Zbuild-std? r=me with commits squash |
Mark-Simulacrum
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Yes, I used it via -Zbuild-std. For instance, the mangled version would help me to build a libos. I would enabled it via https://github.com/hermitcore/rusty-hermit/blob/master/.cargo/config#L3. |
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@bors r+ |
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☀️ Test successful - checks-actions |
Dylan-DPC-zz
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Nov 19, 2020
libary: Forward compiler-builtins "asm" and "mangled-names" feature In principle this is a followup of rust-lang#78472. In the previous PR was the support of the test crate missing. Now users will be able to do: ``` cargo build -Zbuild-std=core -Zbuild-std-features=compiler-builtins-asm ``` and correctly get the assembly implemenations for `memcpy` and friends.
jhpratt
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Jul 27, 2025
…Amanieu
Remove `compiler-builtins-{no-asm,mangled-names}`
Remove `compiler-builtins-no-asm`
This feature used to be for when Cranelift didn't support inline
assembly, but its last uses were removed in 52933e0 ("Don't disable
inline asm usage in compiler-builtins when the cranelift backend is
enabled"). and cba05a7 ("Support naked functions").
This doesn't remove the feature from the `compiler-builtins` crate, that
will be done separately in the subtree repo.
---
Remove `compiler-builtins-mangled-names`
This config was added in 207de01 ("libary: Forward
compiler-builtins "asm" and "mangled-names" feature") but it does not
appear this has ever been used. The PR adding it (rust-lang#78472) says that
this was exposed to help with configuration and points at the [Hermit
Cargo config], but as far as I can tell, this feature name has never
been mentioned in that repository's git history.
Thus, clean up a seemingly unneeded feature.
[Hermit Cargo config]: https://github.com/hermit-os/hermit-rs/blob/ab2b830930e6a9a98c8294997a8183feeabeda4a/.cargo/config
matthiaskrgr
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Jul 27, 2025
…Amanieu
Remove `compiler-builtins-{no-asm,mangled-names}`
Remove `compiler-builtins-no-asm`
This feature used to be for when Cranelift didn't support inline
assembly, but its last uses were removed in 52933e0 ("Don't disable
inline asm usage in compiler-builtins when the cranelift backend is
enabled"). and cba05a7 ("Support naked functions").
This doesn't remove the feature from the `compiler-builtins` crate, that
will be done separately in the subtree repo.
---
Remove `compiler-builtins-mangled-names`
This config was added in 207de01 ("libary: Forward
compiler-builtins "asm" and "mangled-names" feature") but it does not
appear this has ever been used. The PR adding it (rust-lang#78472) says that
this was exposed to help with configuration and points at the [Hermit
Cargo config], but as far as I can tell, this feature name has never
been mentioned in that repository's git history.
Thus, clean up a seemingly unneeded feature.
[Hermit Cargo config]: https://github.com/hermit-os/hermit-rs/blob/ab2b830930e6a9a98c8294997a8183feeabeda4a/.cargo/config
rust-timer
added a commit
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Jul 28, 2025
Rollup merge of #144471 - tgross35:compiler-builtins-asm, r=Amanieu Remove `compiler-builtins-{no-asm,mangled-names}` Remove `compiler-builtins-no-asm` This feature used to be for when Cranelift didn't support inline assembly, but its last uses were removed in 52933e0 ("Don't disable inline asm usage in compiler-builtins when the cranelift backend is enabled"). and cba05a7 ("Support naked functions"). This doesn't remove the feature from the `compiler-builtins` crate, that will be done separately in the subtree repo. --- Remove `compiler-builtins-mangled-names` This config was added in 207de01 ("libary: Forward compiler-builtins "asm" and "mangled-names" feature") but it does not appear this has ever been used. The PR adding it (#78472) says that this was exposed to help with configuration and points at the [Hermit Cargo config], but as far as I can tell, this feature name has never been mentioned in that repository's git history. Thus, clean up a seemingly unneeded feature. [Hermit Cargo config]: https://github.com/hermit-os/hermit-rs/blob/ab2b830930e6a9a98c8294997a8183feeabeda4a/.cargo/config
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In principle the compiler builtin features are also offered to alloc and std.