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-rw-r--r--libcxx/include/__config6
1 files changed, 6 insertions, 0 deletions
diff --git a/libcxx/include/__config b/libcxx/include/__config
index 203be7616cc..8617b866842 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -66,6 +66,12 @@
# endif
#endif // _WIN32
+#ifdef __linux__
+# if defined(__GNUC__) && _GNUC_VER >= 403
+# define _LIBCP_HAS_IS_BASE_OF
+# endif
+#endif
+
#ifdef __sun__
# include <sys/isa_defs.h>
# ifdef _LITTLE_ENDIAN
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