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-rw-r--r--libcxx/include/cctype3
1 files changed, 2 insertions, 1 deletions
diff --git a/libcxx/include/cctype b/libcxx/include/cctype
index 4235cd6acc8c..248f8d98000f 100644
--- a/libcxx/include/cctype
+++ b/libcxx/include/cctype
@@ -34,11 +34,12 @@ int toupper(int c);
} // std
*/
+#include <__assert> // all public C++ headers provide the assertion handler
#include <__config>
#include <ctype.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#pragma GCC system_header
+# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD