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windows-gnu target compatibility with toolchains providing LLVM tools only #72241
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cc @petrochenkov for the second issue, we just need possibility of providing custom |
@mati865 |
@petrochenkov in this specific case we need to replace |
So, I think this is a job for One Another Then 8e3467c is reverted and all the linking is done through #[link(name = "gcc_s", cfg(all(rustc_detect_dynamic, gcc_toolchain)))]
#[link(name = "gcc_eh", cfg(all(not(rustc_detect_dynamic), gcc_toolchain)))]
#[link(name = "unwind", cfg(not(gcc_toolchain)))]
extern {} or something. |
This way we'll eliminate Before 8e3467c With these options moved to the target spec they apply to all programs, even no-std ones. |
I've tried similar approach in #71001 I wanted to avoid new target if possible because we will definitely need new target to allow linking with UCRT instead of MSVCRT since one cannot mix libraries build with UCRT and MSVCRT. EDIT: For x86_64 we could even build libunwind as part of std and link it statically but this somehow results in errors because proc_macro crates are no longer built (just like previously on musl with |
#71001 didn't use |
Wait, so we can use features here not only when building std but also when building user code? 😮 |
@mati865 |
cc #72510 |
@nu8 |
No it's not specific to LLVM at all.
@petrochenkov few days ago MSYS2 upgraded mingw-w64 and it broke winpthreads library. Fix was committed on the next day I think. Issue described by @nu8 is caused by using toolchain from |
@petrochenkov I reproduced your issue by upgrading mingw-w64 among the other packages... Currently Rust does it this way: rust/src/librustc_target/spec/windows_gnu_base.rs Lines 20 to 38 in 64ad709
Now compare it to GCC which adjusts their list as need, last adjustment happened 2 weeks ago in gcc-mirror/gcc@850533a. Clang solves it by using At this point I don't know whether Rust should:
I'm currently looking for workaround to make |
Hmm, shouldn't it be possible to make a "union" list that would work both pre- and post-gcc-mirror/gcc@850533a by passing some libraries multiple times?
|
That seems to do the trick for now: index f556bf03f02..744f26239ca 100644
--- a/src/librustc_target/spec/windows_gnu_base.rs
+++ b/src/librustc_target/spec/windows_gnu_base.rs
@@ -20,9 +20,9 @@ pub fn opts() -> TargetOptions {
late_link_args.insert(
LinkerFlavor::Gcc,
vec > Target names should not introduce undue confusion or ambiguity unless absolutely necessary to maintain ecosystem compatibility. For example, if the name of the target makes people extremely likely to form incorrect beliefs about what it targets, the name should be changed or augmented to disambiguate it. I think the explanation in platform support doc is enough to make this aspect clear. > Tier 3 targets may have unusual requirements to build or use, but must not create legal issues or impose onerous legal terms for the Rust project or for Rust developers or users. It's using open source tools only. > The target must not introduce license incompatibilities. It's even more liberal than already existing `*-pc-windows-gnu`. > Anything added to the Rust repository must be under the standard Rust license (MIT OR Apache-2.0). Understood. > The target must not cause the Rust tools or libraries built for any other host (even when supporting cross-compilation to the target) to depend on any new dependency less permissive than the Rust licensing policy. This applies whether the dependency is a Rust crate that would require adding new license exceptions (as specified by the tidy tool in the rust-lang/rust repository), or whether the dependency is a native library or binary. In other words, the introduction of the target must not cause a user installing or running a version of Rust or the Rust tools to be subject to any new license requirements. There are no new dependencies/features required. > Compiling, linking, and emitting functional binaries, libraries, or other code for the target (whether hosted on the target itself or cross-compiling from another target) must not depend on proprietary (non-FOSS) libraries. Host tools built for the target itself may depend on the ordinary runtime libraries supplied by the platform and commonly used by other applications built for the target, but those libraries must not be required for code generation for the target; cross-compilation to the target must not require such libraries at all. For instance, rustc built for the target may depend on a common proprietary C runtime library or console output library, but must not depend on a proprietary code generation library or code optimization library. Rust's license permits such combinations, but the Rust project has no interest in maintaining such combinations within the scope of Rust itself, even at tier 3. As previously said it's using open source tools only. > "onerous" here is an intentionally subjective term. At a minimum, "onerous" legal/licensing terms include but are not limited to: non-disclosure requirements, non-compete requirements, contributor license agreements (CLAs) or equivalent, "non-commercial"/"research-only"/etc terms, requirements conditional on the employer or employment of any particular Rust developers, revocable terms, any requirements that create liability for the Rust project or its developers or users, or any requirements that adversely affect the livelihood or prospects of the Rust project or its developers or users. There are no such terms present/ > Neither this policy nor any decisions made regarding targets shall create any binding agreement or estoppel by any party. If any member of an approving Rust team serves as one of the maintainers of a target, or has any legal or employment requirement (explicit or implicit) that might affect their decisions regarding a target, they must recuse themselves from any approval decisions regarding the target's tier status, though they may otherwise participate in discussions. I'm not the reviewer here. > This requirement does not prevent part or all of this policy from being cited in an explicit contract or work agreement (e.g. to implement or maintain support for a target). This requirement exists to ensure that a developer or team responsible for reviewing and approving a target does not face any legal threats or obligations that would prevent them from freely exercising their judgment in such approval, even if such judgment involves subjective matters or goes beyond the letter of these requirements. Again I'm not the reviewer here. > Tier 3 targets should attempt to implement as much of the standard libraries as possible and appropriate (core for most targets, alloc for targets that can support dynamic memory allocation, std for targets with an operating system or equivalent layer of system-provided functionality), but may leave some code unimplemented (either unavailable or stubbed out as appropriate), whether because the target makes it impossible to implement or challenging to implement. The authors of pull requests are not obligated to avoid calling any portions of the standard library on the basis of a tier 3 target not implementing those portions. > The target must provide documentation for the Rust community explaining how to build for the target, using cross-compilation if possible. If the target supports running binaries, or running tests (even if they do not pass), the documentation must explain how to run such binaries or tests for the target, using emulation if possible or dedicated hardware if necessary. Building is described in platform support doc, running tests doesn't work right now (without hacks) because Rust's build system doesn't seem to support testing targets built from `.json`. Docs will be updated once this lands in beta allowing master branch to build and run tests without `.json` files. > Tier 3 targets must not impose burden on the authors of pull requests, or other developers in the community, to maintain the target. In particular, do not post comments (automated or manual) on a PR that derail or suggest a block on the PR based on a tier 3 target. Do not send automated messages or notifications (via any medium, including via `@)` to a PR author or others involved with a PR regarding a tier 3 target, unless they have opted into such messages. Understood. > Backlinks such as those generated by the issue/PR tracker when linking to an issue or PR are not considered a violation of this policy, within reason. However, such messages (even on a separate repository) must not generate notifications to anyone involved with a PR who has not requested such notifications. Understood. > Patches adding or updating tier 3 targets must not break any existing tier 2 or tier 1 target, and must not knowingly break another tier 3 target without approval of either the compiler team or the maintainers of the other tier 3 target. I believe I didn't break any other target. > In particular, this may come up when working on closely related targets, such as variations of the same architecture with different features. Avoid introducing unconditional uses of features that another variation of the target may not have; use conditional compilation or runtime detection, as appropriate, to let each target run code supported by that target. I think there are no such problems in this PR.
Rust currently assumes all GNU libraries and tools are present. This is not the case when using LLVM only toolchains like this one: https://github.com/mstorsjo/llvm-mingw
Remaining issues:
libgcc
,libgcc_eh
,libgcc_s
Opening the issue so interested people can track it easily.
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