63 lines
2.2 KiB
Diff
63 lines
2.2 KiB
Diff
From f0065f207cf19cd960b33d961472c6d69514336f Mon Sep 17 00:00:00 2001
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From: Samuel Thibault <samuel.thibault@gnu.org>
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Date: Fri, 7 Oct 2022 22:45:06 +0200
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Subject: [PATCH] libstdc++: Mark pieces of gnu-linux/os_support.h
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linux-specific
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This is notably needed because in glibc 2.34, the move of pthread functions
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into libc.so happened for Linux only, not GNU/Hurd.
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The pthread_self() function can also always be used fine as it is on
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GNU/Hurd.
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libstdc++-v3/ChangeLog:
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* config/os/gnu-linux/os_defines.h [!__linux__]
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(_GLIBCXX_NATIVE_THREAD_ID, _GLIBCXX_GTHREAD_USE_WEAK): Do not define.
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Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
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---
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libstdc++-v3/config/os/gnu-linux/os_defines.h | 22 +++++++++++--------
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1 file changed, 13 insertions(+), 9 deletions(-)
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diff --git a/libstdc++-v3/config/os/gnu-linux/os_defines.h b/libstdc++-v3/config/os/gnu-linux/os_defines.h
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index 3064f8d908ac2..87317031fcd71 100644
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--- a/libstdc++-v3/config/os/gnu-linux/os_defines.h
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+++ b/libstdc++-v3/config/os/gnu-linux/os_defines.h
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@@ -60,22 +60,26 @@
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# define _GLIBCXX_HAVE_FLOAT128_MATH 1
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#endif
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-#if __GLIBC_PREREQ(2, 27)
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+#ifdef __linux__
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+// The following libpthread properties only apply to Linux, not GNU/Hurd.
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+
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+# if __GLIBC_PREREQ(2, 27)
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// Since glibc 2.27 pthread_self() is usable without linking to libpthread.
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-# define _GLIBCXX_NATIVE_THREAD_ID pthread_self()
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-#else
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+# define _GLIBCXX_NATIVE_THREAD_ID pthread_self()
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+# else
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// Before then it was in libc.so.6 but not libc.a, and always returns 0,
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// which breaks the invariant this_thread::get_id() != thread::id{}.
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// So only use it if we know the libpthread version is available.
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// Otherwise use (__gthread_t)1 as the ID of the main (and only) thread.
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-# define _GLIBCXX_NATIVE_THREAD_ID \
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- (__gthread_active_p() ? __gthread_self() : (__gthread_t)1)
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-#endif
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+# define _GLIBCXX_NATIVE_THREAD_ID \
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+ (__gthread_active_p() ? __gthread_self() : (__gthread_t)1)
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+# endif
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-#if __GLIBC_PREREQ(2, 34)
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+# if __GLIBC_PREREQ(2, 34)
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// Since glibc 2.34 all pthreads functions are usable without linking to
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// libpthread.
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-# define _GLIBCXX_GTHREAD_USE_WEAK 0
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-#endif
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+# define _GLIBCXX_GTHREAD_USE_WEAK 0
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+# endif
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+#endif // __linux__
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#endif
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