diff --git a/contrib/compiler-rt/lib/int_lib.h b/contrib/compiler-rt/lib/int_lib.h
index 2328a1dca28..594e8128827 100644
--- a/contrib/compiler-rt/lib/int_lib.h
+++ b/contrib/compiler-rt/lib/int_lib.h
@@ -25,7 +25,15 @@
 #if __ARM_EABI__
 # define ARM_EABI_FNALIAS(aeabi_name, name)         \
   void __aeabi_##aeabi_name() __attribute__((alias("__" #name)));
-# define COMPILER_RT_ABI __attribute__((pcs("aapcs")))
+
+# if !defined(__clang__) && defined(__GNUC__) && \
+     (__GNUC__ < 4 || __GNUC__ == 4 && __GNUC_MINOR__ < 5)
+/* The pcs attribute was introduced in GCC 4.5.0 */
+#  define COMPILER_RT_ABI
+# else
+#  define COMPILER_RT_ABI __attribute__((pcs("aapcs")))
+# endif
+
 #else
 # define ARM_EABI_FNALIAS(aeabi_name, name)
 # define COMPILER_RT_ABI