Add missing header for _LIBUNWIND_LOG().

llvm-svn: 211775

diff --git a/libcxxabi/src/Unwind/config.h b/libcxxabi/src/Unwind/config.h
index 638dab2..6f0d1cf 100644 (file)
--- a/libcxxabi/src/Unwind/config.h
+++ b/libcxxabi/src/Unwind/config.h
@@ -15,6 +15,7 @@
 #define LIBUNWIND_CONFIG_H
 
 #include <assert.h>
+#include <stdio.h>
 
 // Define static_assert() unless already defined by compiler.
 #ifndef __has_feature