Fix compilation error with -DLIBCXXABI_ENABLE_THREADS=OFF

mplatings · mplatings · commit d144572dac23 · 2019-04-25T09:27:50.000Z
The error is:

libcxxabi/src/cxa_guard_impl.h: In instantiation of ‘__cxxabiv1::{anonymous}::LibcppMutex __cxxabiv1::{anonymous}::GlobalStatic&lt;__cxxabiv1::{anonymous}::LibcppMutex&gt;::instance’:
libcxxabi/src/cxa_guard_impl.h:529:62:   required from here
libcxxabi/src/cxa_guard_impl.h:510:23: error: ‘__cxxabiv1::{anonymous}::LibcppMutex __cxxabiv1::{anonymous}::GlobalStatic&lt;__cxxabiv1::{anonymous}::LibcppMutex&gt;::instance’ has incomplete type
 _LIBCPP_SAFE_STATIC T GlobalStatic&lt;T&gt;::instance = {};
                       ^

llvm-svn: 359175
diff --git a/libcxxabi/src/cxa_guard_impl.h b/libcxxabi/src/cxa_guard_impl.h
@@ -257,6 +257,9 @@ struct LibcppCondVar {
 private:
   std::__libcpp_condvar_t cond = _LIBCPP_CONDVAR_INITIALIZER;
 };
+#else
+struct LibcppMutex {};
+struct LibcppCondVar {};
 #endif // !defined(_LIBCXXABI_HAS_NO_THREADS)
 
 
