release/20.x: [libc++] Avoid including <features.h> on arbitrary platforms (#125587) #127310
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llvmbot
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@llvm/pr-subscribers-libcxx Author: None (llvmbot) ChangesBackport cffc1ac Requested by: @ldionne Full diff: https://github.com/llvm/llvm-project/pull/127310.diff 1 Files Affected:
diff --git a/libcxx/include/__configuration/platform.h b/libcxx/include/__configuration/platform.h
index 2a92ce209b91f..cff99376ee24b 100644
--- a/libcxx/include/__configuration/platform.h
+++ b/libcxx/include/__configuration/platform.h
@@ -30,12 +30,9 @@
// ... add new file formats here ...
#endif
-// To detect which libc we're using
-#if __has_include(<features.h>)
+// Need to detect which libc we're using if we're on Linux.
+#if defined(__linux__) || defined(__AMDGPU__) || defined(__NVPTX__)
# include <features.h>
-#endif
-
-#if defined(__linux__)
# if defined(__GLIBC_PREREQ)
# define _LIBCPP_GLIBC_PREREQ(a, b) __GLIBC_PREREQ(a, b)
# else
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(FYI, possibly causes test failures on mac: #125587 (comment)) |
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Thanks for the heads up. I think we should merge this but also cherry-pick #127691 into LLVM 20 to fix that issue. |
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@tstellar Can we merge this one? I have another fix I want to cherry-pick which depends on this one. |
…5587) This partially reverts commit 5f2389d. That commit started checking whether <features.h> was a valid include unconditionally, however codebases are free to have such a header on their search path, which breaks compilation. LLVM libc now provides a more standard way of getting configuration macros like __LLVM_LIBC__. After this patch, we only include <features.h> when we're on Linux or when we're compiling for GPUs. (cherry picked from commit cffc1ac)
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@ldionne (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix. When you are done, please add the release:note label to this PR. |
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Backport cffc1ac
Requested by: @ldionne