Index: libcxxabi/include/cxxabi.h
===================================================================
--- libcxxabi/include/cxxabi.h
+++ libcxxabi/include/cxxabi.h
@@ -160,8 +160,8 @@
 extern _LIBCXXABI_FUNC_VIS bool __cxa_uncaught_exception() throw();
 extern _LIBCXXABI_FUNC_VIS unsigned int __cxa_uncaught_exceptions() throw();
 
-#ifdef __linux__
-// Linux TLS support. Not yet an official part of the Itanium ABI.
+#if defined(__linux__) || defined(__Fuchsia__)
+// Linux and Fuchsia TLS support. Not yet an official part of the Itanium ABI.
 // https://sourceware.org/glibc/wiki/Destructor%20support%20for%20thread_local%20variables
 extern _LIBCXXABI_FUNC_VIS int __cxa_thread_atexit(void (*)(void *), void *,
                                                    void *) throw();