Merge "Turn on string-plus-int warning"

		// Disable this warning because we don't care about behavior with older compilers.

		"-Wno-return-std-move-in-c++11",

		// Disable -Wstring-plus-int until the instances detected by this new warning is

		// fixed.

		"-Wno-string-plus-int",

	}, " "))

	// Extra cflags for projects under external/ directory