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* [gcc r10-10928] libstdc++: Disable gthreads weak symbols for glibc 2.34 [PR103133]
@ 2022-08-03 12:30 Jonathan Wakely
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From: Jonathan Wakely @ 2022-08-03 12:30 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:18eecb8c4a97716d4bc4890b05c91f172fadc7b3
commit r10-10928-g18eecb8c4a97716d4bc4890b05c91f172fadc7b3
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Tue Nov 9 23:45:36 2021 +0000
libstdc++: Disable gthreads weak symbols for glibc 2.34 [PR103133]
Since Glibc 2.34 all pthreads symbols are defined directly in libc not
libpthread, and since Glibc 2.32 we have used __libc_single_threaded to
avoid unnecessary locking in single-threaded programs. This means there
is no reason to avoid linking to libpthread now, and so no reason to use
weak symbols defined in gthr-posix.h for all the pthread_xxx functions.
libstdc++-v3/ChangeLog:
PR libstdc++/100748
PR libstdc++/103133
* config/os/gnu-linux/os_defines.h (_GLIBCXX_GTHREAD_USE_WEAK):
Define for glibc 2.34 and later.
(cherry picked from commit 80fe172ba9820199c2bbce5d0611ffca27823049)
Diff:
---
libstdc++-v3/config/os/gnu-linux/os_defines.h | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/libstdc++-v3/config/os/gnu-linux/os_defines.h b/libstdc++-v3/config/os/gnu-linux/os_defines.h
index 01bfa9ddd4f..cb842ea26aa 100644
--- a/libstdc++-v3/config/os/gnu-linux/os_defines.h
+++ b/libstdc++-v3/config/os/gnu-linux/os_defines.h
@@ -61,4 +61,10 @@
(__gthread_active_p() ? __gthread_self() : (__gthread_t)1)
#endif
+#if __GLIBC_PREREQ(2, 34)
+// Since glibc 2.34 all pthreads functions are usable without linking to
+// libpthread.
+# define _GLIBCXX_GTHREAD_USE_WEAK 0
+#endif
+
#endif
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