Merge pull request #4803 from Arthapz/fix-stdmodule-clang-default-runtimes

fix C++ library detection when no runtimes is passed

Author: waruqi

xmake/rules/c++/modules/modules_support/clang/compiler_support.lua

@@ -67,7 +67,14 @@ function _get_cpplibrary_name(target)
         return "c++"
     elseif target:has_runtime("stdc++_shared", "stdc++_static") then
         return "stdc++"
-    elseif target:is_plat("windows") and target:has_runtime("MD", "MT", "MDd", "MTd") then
+    elseif target:has_runtime("MD", "MT", "MDd", "MTd") then
+        return "msstl"
+    end
+    if target:is_plat("macosx") then
+        return "c++"
+    elseif target:is_plat("linux") then
+        return "stdc++"
+    elseif target:is_plat("windows") then
         return "msstl"
     end
 end