[libcxxabi] Add __cxa_thread_atexit for TLS support on Linux.
Summary:
Fixes PR21738.
The implementation for this is handled by __cxa_thread_atexit_impl,
which is supplied by libc.
More information:
https://sourceware.org/glibc/wiki/Destructor%20support%20for%20thread_local%20variables
Reviewers: mclow.lists, EricWF, jroelofs
Reviewed By: jroelofs
Subscribers: majnemer, cfe-commits
Differential Revision: http://reviews.llvm.org/D6708
git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@224477 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/cxxabi.h b/include/cxxabi.h
index 46d6730..e5c9b66 100644
--- a/include/cxxabi.h
+++ b/include/cxxabi.h
@@ -178,6 +178,12 @@
// Apple addition to support std::uncaught_exception()
extern bool __cxa_uncaught_exception() throw();
+#ifdef __linux__
+// Linux TLS support. Not yet an official part of the Itanium ABI.
+// https://sourceware.org/glibc/wiki/Destructor%20support%20for%20thread_local%20variables
+extern int __cxa_thread_atexit(void (*)(void *), void *, void *) throw();
+#endif
+
} // extern "C"
} // namespace __cxxabiv1