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Experimental cygwin support in rustc #140154

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Berrysoft
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@Berrysoft Berrysoft commented Apr 22, 2025 •
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This PR is not enough, but necessary to build host rustc targeting cygwin. See #137819 to track the process.

I also patched some crates to build it:

The build script of rustc_llvm is modified a little because llvm-config of MSYS2 is broken:

$ build/x86_64-pc-cygwin/stage2/bin/rustc.exe --version --verbose
rustc 1.88.0-dev
binary: rustc
commit-hash: unknown
commit-date: unknown
host: x86_64-pc-cygwin
release: 1.88.0-dev
LLVM version: 20.1.3

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rustbot commented Apr 22, 2025

r? @compiler-errors

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@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Apr 22, 2025
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I suggest reviewing this PR before all dependencies ready:)

@jieyouxu jieyouxu added the O-cygwin Target: *-pc-cygwin label Apr 25, 2025
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I'm looking forward to being able to try this, and I bet @tyan0 and others from Cygwin are too!

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jeremyd2019 commented May 8, 2025 •
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The build script of rustc_llvm is modified a little because llvm-config of MSYS2 is broken:

This should be fixed now (llvm/llvm-project#136599), and _GNU_SOURCE is defined in llvm-config --cppflags and friends (llvm/llvm-project#138329):

$ llvm-config --cxxflags
-I/usr/include -std=c++17   -fno-exceptions -funwind-tables -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS

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Oh, yes. Now the blockers are the dependencies...

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O-cygwin Target: *-pc-cygwin S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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