[clang] [docs] Clarify the issue with compiler-rt on Windows/MSVC #106875
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Compiler-rt does support Windows just fine, even if outdated docs pages didn't list it as one of the supported OSes, this is being rectified in llvm#106874. MinGW is another environment configuration on Windows, where compiler-rt or libgcc is linked in automatically, so there's no issue with having such builtins functions available. For MSVC style environments, compiler-rt builtins do work just fine, but Clang doesn't automatically link them in. See e.g. https://discourse.llvm.org/t/improve-autolinking-of-compiler-rt-and-libc-on-windows-with-lld-link/71392 for a discussion on how to improve this situation. But none of that issue is that compiler-rt itself wouldn't support Windows.
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@llvm/pr-subscribers-clang Author: Martin Storsjö (mstorsjo) ChangesCompiler-rt does support Windows just fine, even if outdated docs pages didn't list it as one of the supported OSes, this is being rectified in #106874. MinGW is another environment configuration on Windows, where compiler-rt or libgcc is linked in automatically, so there's no issue with having such builtins functions available. For MSVC style environments, compiler-rt builtins do work just fine, but Clang doesn't automatically link them in. See e.g. https://discourse.llvm.org/t/improve-autolinking-of-compiler-rt-and-libc-on-windows-with-lld-link/71392 for a discussion on how to improve this situation. But none of that issue is that compiler-rt itself wouldn't support Windows. Full diff: https://github.com/llvm/llvm-project/pull/106875.diff 1 Files Affected:
diff --git a/clang/www/c_status.html b/clang/www/c_status.html
index 91638331be877a..255690cd6d34e2 100644
--- a/clang/www/c_status.html
+++ b/clang/www/c_status.html
@@ -1057,8 +1057,8 @@ <h2 id="c99">C99 implementation status</h2>
conformance to Annex G.<br />
<br />
<code>_Complex</code> support requires an underlying support library
- such as compiler-rt to provide functions like <code>__divsc3</code>,
- but compiler-rt is not supported on Windows.
+ such as compiler-rt to provide functions like <code>__divsc3</code>.
+ Compiler-rt isn't linked in automatically in MSVC style environments.
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Added @vitalybuka for awareness, but given that the other PR was accepted and landed, I think this one makes sense to land as well. LGTM, thank you!
Compiler-rt does support Windows just fine, even if outdated docs pages didn't list it as one of the supported OSes, this is being rectified in #106874.
MinGW is another environment configuration on Windows, where compiler-rt or libgcc is linked in automatically, so there's no issue with having such builtins functions available.
For MSVC style environments, compiler-rt builtins do work just fine, but Clang doesn't automatically link them in. See e.g. https://discourse.llvm.org/t/improve-autolinking-of-compiler-rt-and-libc-on-windows-with-lld-link/71392 for a discussion on how to improve this situation. But none of that issue is that compiler-rt itself wouldn't support Windows.