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-rw-r--r--lib/libcxxabi/src/fallback_malloc.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/libcxxabi/src/fallback_malloc.cpp b/lib/libcxxabi/src/fallback_malloc.cpp
index 336ad31b017..bec9952596b 100644
--- a/lib/libcxxabi/src/fallback_malloc.cpp
+++ b/lib/libcxxabi/src/fallback_malloc.cpp
@@ -7,6 +7,9 @@
//
//===----------------------------------------------------------------------===//
+// Define _LIBCPP_BUILDING_LIBRARY to ensure _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
+// is only defined when libc aligned allocation is not available.
+#define _LIBCPP_BUILDING_LIBRARY
#include "fallback_malloc.h"
#include <__threading_support>