llvm: build pure llvm toolchain + zig: enable mingw64 & ucrt64 #21485
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without target triple zig compiler segfaulted for me. why did you remove it? |
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im so confused right now.. on clang, it will always fails at |
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I downloaded your PKGBUILD file for mingw-w64-clang-x86_64-zig, and built it locally. your PKGBUILD file: the built package: the build script (powershell): |
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yes, zig will build fine under current libc++ on this repo, but clang from this PR will fail to load with the new libc++ from this PR. edit: its not clang, but cmake that failed to load with the new libc++. |
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@lazka please review |
mingw-w64-libc++/PKGBUILD
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| # Targeting Win 7 will just lead to libc++ looking | ||
| # up new APIs at runtime, so there is no downside really | ||
| local _win32_winnt | ||
| if [[ ${MSYSTEM} == CLANGARM64 ]]; then | ||
| if [[ ${MSYSTEM} == CLANG* ]]; then |
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i hit linker errors from undefined stdlib implementations (_free, _memcpy, etc) when compiling ruby v3.3.4 on clang32 system.. just want to experiment something here..
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it also makes sense as UCRT is available only in Windows 10 or later (I forgot it at the moment)
I'm afraid I don't know enough about llvm to know what this is trying to change any why, so I can't. And llvm is too much of a core package to just press merge and see. |
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this change is needed to make zig build on mingw64 and ucrt64, because zig needs llvm with builtin compiler-rt |
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- builds a pure llvm toolchain on top of MinGW - builds libc++ and libunwind with builtin compiler-rt on all systems - emulated TLS is disabled when building with Clang - remove dependency of libgcc_s and libpthread on non Clang systems - fix building of libc++abi shared library
Notes:
We previously build with
-DLIBCXXABI_ENABLE_STATIC_UNWINDER=ONwhich actually leads to libc++ not depends on libunwind, with both libc++ and libunwind exporting the same unwind functions.If we set
-DLIBCXXABI_ENABLE_STATIC_UNWINDER=OFF, then libc++ will correctly depends on libunwind.