improve symbols for clang

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

@@ -75,11 +75,22 @@ function load(target)
     target:add("cxxflags", builtinmodulemapflag, {force = true})
     target:add("cxxflags", implicitmodulesflag, {force = true})
 
-    -- TODO fix default visibility for functions and variables [-fvisibility] differs in PCH file vs. current file
+    -- fix default visibility for functions and variables [-fvisibility] differs in PCH file vs. current file
     -- module.pcm cannot be loaded due to a configuration mismatch with the current compilation.
     --
     -- it will happen in binary target depend ont shared target with modules, and enable release mode at same time.
-    target:set("symbols", "none")
+    local dep_symbols
+    local has_shared_deps = false
+    for _, dep in ipairs(target:orderdeps()) do
+        if dep:is_shared() then
+            dep_symbols = dep:get("symbols")
+            has_shared_deps = true
+            break
+        end
+    end
+    if has_shared_deps then
+        target:set("symbols", dep_symbols and dep_symbols or "none")
+    end
 
     -- if use libc++, we need install libc++ and libc++abi
     --