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* [gcc r14-6082] libsupc++: try cxa_thread_atexit_impl at runtime
@ 2023-12-02 17:15 Alexandre Oliva
0 siblings, 0 replies; only message in thread
From: Alexandre Oliva @ 2023-12-02 17:15 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:f4dd9416843308d4ae519983415fe62212662536
commit r14-6082-gf4dd9416843308d4ae519983415fe62212662536
Author: Alexandre Oliva <oliva@adacore.com>
Date: Sat Dec 2 14:14:02 2023 -0300
libsupc++: try cxa_thread_atexit_impl at runtime
g++.dg/tls/thread_local-order2.C fails when the toolchain is built for
a platform that lacks __cxa_thread_atexit_impl, even if the program is
built and run using that toolchain on a (later) platform that offers
__cxa_thread_atexit_impl.
This patch adds runtime testing for __cxa_thread_atexit_impl on
platforms that support weak symbols.
for libstdc++-v3/ChangeLog
* libsupc++/atexit_thread.cc [__GXX_WEAK__]: Add dynamic
detection of __cxa_thread_atexit_impl.
Diff:
---
libstdc++-v3/libsupc++/atexit_thread.cc | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/libstdc++-v3/libsupc++/atexit_thread.cc b/libstdc++-v3/libsupc++/atexit_thread.cc
index 9346d50f5da..cabd7c0a4a0 100644
--- a/libstdc++-v3/libsupc++/atexit_thread.cc
+++ b/libstdc++-v3/libsupc++/atexit_thread.cc
@@ -138,11 +138,24 @@ namespace {
}
}
+#if __GXX_WEAK__
+extern "C"
+int __attribute__ ((__weak__))
+__cxa_thread_atexit_impl (void (_GLIBCXX_CDTOR_CALLABI *func) (void *),
+ void *arg, void *d);
+#endif
+
+// ??? We can't make it an ifunc, can we?
extern "C" int
__cxxabiv1::__cxa_thread_atexit (void (_GLIBCXX_CDTOR_CALLABI *dtor)(void *),
- void *obj, void */*dso_handle*/)
+ void *obj, void *dso_handle)
_GLIBCXX_NOTHROW
{
+#if __GXX_WEAK__
+ if (__cxa_thread_atexit_impl)
+ return __cxa_thread_atexit_impl (dtor, obj, dso_handle);
+#endif
+
// Do this initialization once.
if (__gthread_active_p ())
{
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2023-12-02 17:15 [gcc r14-6082] libsupc++: try cxa_thread_atexit_impl at runtime Alexandre Oliva
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