Update the compiler-builtins subtree
#143405
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This PR adds a minimal `triagebot.toml` config to make contributions to this repository respect upstream rust-lang/rust conventions and avoid issues when syncing this subtree.
Rather than re-opening the archive file for each check, add a wrapper that keeps the data in memory. Additionally, collect the `--target` argument so it can be used within this crate.
Often our short summaries will pick up a Bors "Auto merge of #xxxx ...` commit message. Replace these with something like `rust-lang#1234` to avoid broken links when going between repositories.
…i256 and u256 `i256` and `u256` - operators now use the same overflow convention as primitives - implement `<<` and `-` (previously just `>>` and `+`) - implement `Ord` correctly (the previous `PartialOrd` was broken) - correct `i256::SIGNED` to `true` The `Int`-trait is extended with `trailing_zeros`, `carrying_add`, and `borrowing_sub`.
Currently we whether or not to build and test `f16` and `f128` support
mostly based on the target triple. This isn't always accurate, however,
since support also varies by backend and the backend version.
Since recently, `rustc` is aware of this with the unstable config option
`target_has_reliable_{f16,f128}`, which better represents when the types
are actually expected to be available and usable. Switch our
compiler-builtins and libm configuration to use this by probing `rustc`
for the target's settings.
A few small `cfg` fixes are needed with this.
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Update the `compiler-builtins` subtree Update the Josh subtree to rust-lang/compiler-builtins@ed17b95715dd. r? `@ghost`
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This makes it more obvious what we intend to check rather than looking for `--target`.
Rather than printing the entire JSON dump, use the rendered version.
8521530f4938 ("Fix __divsi3 and __udivsi3 on thumbv6m targets") removed
tests that use these `thumb*-linux` target files in favor of tests that
use the `thumb*-none` targets, which are available via Rustup. The JSON
files haven't been used since then and are outdated, so remove them.
The `rustc` probe done in our build scripts needs to pass `--target` to get the correct configuration, which usually comes from the `TARGET` environment variable. However, for targets specified via a `target.json` file, `TARGET` gets set to the file name without an extension or path. `rustc` will check a search path to attempt to locate the file, but this is likely to fail since the directory where Cargo invokes build scripts (and hence where those scripts invoke `rustc`) might not have any relation to the JSON spec file. Resolve this for now by leaving `f16` and `f128` disabled if the `rustc` command fails. Result of the discussion at CARGO-14208 may eventually provide a better solution. A CI test is also added since custom JSON files are an edge case that could fail in other ways. I verified this fails without the fix here. The JSON file is the output for `thumbv7em-none-eabi`, just renamed so `rustc` doesn't identify it.
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Update the `compiler-builtins` subtree Update the Josh subtree to rust-lang/compiler-builtins@8aba4c899ee8. r? `@ghost`
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`conv-bits-runtime-const` gates `f16` and `f128` tests behind `x86_64`,
but this isn't always accurate. In particular, x86 `MinGW` has an ABI
bug [1] which means things work when linked to our Rust math libraries
but don't work with host libraries. RUST-143405 slightly adjusts which
targets we provide `f16` and `f128` symbols for and effectively removes
MinGW from that list, meaning host libraries start getting linked,
meaning `f16` and `f128` tests start to fail.
Account for this by changing the gates in one such test to
`cfg(target_has_reliable_{f16,f128})` which is the way we should be
gating all behavior related to the types going forward.
`rustfmt` also seems to have formatted the macros which is fine.
[1]: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115054
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Update the `compiler-builtins` subtree Update the Josh subtree to rust-lang/compiler-builtins@8aba4c899ee8. r? `@ghost` try-job: x86_64-mingw-* try-job: aarch64-apple
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Update the Josh subtree to rust-lang/compiler-builtins@8aba4c899ee8.
r? @ghost