silent unknown warning for clang toolchain

Author: Arthapz

xmake.lua

@@ -74,7 +74,7 @@ if is_plat("windows") then
 	add_cxflags("/wd4275", {tools = "cl"}) -- DLL-interface class 'class_1' used as base for DLL-interface blah
 else
 	-- GCC-compatible (GCC, Clang, ...)
-	add_cxflags("-Wtrampolines")
+	add_cxflags("-Wtrampolines", {tools = "gcc"})
 	add_cxflags("-Werror=inconsistent-missing-override", {tools = "clang"})
 	add_cxflags("-Werror=reorder")
 	add_cxflags("-Werror=suggest-override", {tools = "gcc"})