rust/library/std/src/sys/personality/gcc.rs, branch perf-tmp

library: Migrate from `cfg_if` to `cfg_select`

2025-08-16T12:28:31+00:00

Migrate the standard library from using the external `cfg_if` crate to using the now-built-in `cfg_select` macro. This does not yet eliminate the dependency from `library/std/Cargo.toml`, because while the standard library itself no longer uses `cfg_if`, it also incorporates the `backtrace` crate, which does. Migration assisted by the following vim command (after selecting the full `cfg_if!` invocation): ``` '<,'>s/\(cfg_if::\)\?cfg_if/cfg_select/ | '<,'>s/^\( *\)} else {/\1}\r\1_ => {/c | '<,'>s/^\( *\)} else if #\[cfg(\(.*\))\] /\1}\r\1\2 => /e | '<,'>s/if #\[cfg(\(.*\))\] {/\1 => {/e ``` This is imperfect, but substantially accelerated the process. This prompts for confirmation on the `} else {` since that can also appear inside one of the arms. This also requires manual intervention to handle any multi-line conditions.

Add new Tier-3 targets: `loongarch32-unknown-none*`

2025-06-06T00:19:38+00:00

MCP: https://github.com/rust-lang/compiler-team/issues/865

Rollup merge of #137621 - Berrysoft:cygwin-std, r=joboet

2025-03-17T09:47:49+00:00

Add std support to cygwin target

make `_Unwind_Action` a type alias, not enum

2025-03-16T20:32:41+00:00

It's bitflags in practice, so an enum is unsound, as an enum must only have the described values. The x86_64 psABI declares it as a `typedef int _Unwind_Action`, which seems reasonable. I made a newtype first but that was more annoying than just a typedef. We don't really use this value for much other than a short check.

Fix panic handler for cygwin

2025-03-12T07:48:05+00:00

Mark extern blocks as unsafe

2025-02-09T17:11:13+00:00

update link to "C++ Exceptions under the hood" blog

2024-11-29T10:46:34+00:00

The link was introduced in 0ec321f7b541fcbfbf20286beb497e6d9d3352b2. For the old link see https://web.archive.org/web/20170409223244/https://monoinfinito.wordpress.com/series/exception-handling-in-c/. The blog has migrated from WordPress to Blogger in 2021 and to GitHub pages in 2024.

Fix linking error when compiling for 32-bit watchOS

2024-09-08T07:12:31+00:00

In https://github.com/rust-lang/rust/pull/124748, I mistakenly conflated "not SjLj" to mean "ARM EHABI", which isn't true, watchOS armv7k (specifically only that architecture) uses a third unwinding method called "DWARF CFI".

Reformat `use` declarations.

2024-07-28T22:26:52+00:00

The previous commit updated `rustfmt.toml` appropriately. This commit is the outcome of running `x fmt --all` with the new formatting options.

std: update comments on gcc personality fn

2024-07-24T23:17:52+00:00