[WASM] Make -use-static-resource-dir default flag for wasm target

We should handle -no-static-stdlib when wasm will support dynamic linking.
But currently, it's ok to always link stdlib statically when wasm
target.

Author: kateinoigakukun

lib/Driver/Driver.cpp

@@ -2249,7 +2249,8 @@ bool Driver::handleImmediateArgs(const ArgList &Args, const ToolChain &TC) {
     if (Args.hasFlag(options::OPT_static_executable,
                      options::OPT_no_static_executable, false) ||
         Args.hasFlag(options::OPT_static_stdlib, options::OPT_no_static_stdlib,
-                     false)) {
+                     false) ||
+        TC.getTriple().isOSBinFormatWasm()) {
       commandLine.push_back("-use-static-resource-dir");
     }
 

lib/Driver/ToolChains.cpp

@@ -528,7 +528,8 @@ ToolChain::constructInvocation(const CompileJobAction &job,
   if (context.Args.hasFlag(options::OPT_static_executable,
                            options::OPT_no_static_executable, false) ||
       context.Args.hasFlag(options::OPT_static_stdlib,
-                           options::OPT_no_static_stdlib, false)) {
+                           options::OPT_no_static_stdlib, false) ||
+      getTriple().isOSBinFormatWasm()) {
     Arguments.push_back("-use-static-resource-dir");
   }
 
@@ -1023,7 +1024,8 @@ ToolChain::constructInvocation(const MergeModuleJobAction &job,
   if (context.Args.hasFlag(options::OPT_static_executable,
                             options::OPT_no_static_executable, false) ||
       context.Args.hasFlag(options::OPT_static_stdlib,
-                            options::OPT_no_static_stdlib, false)) {
+                            options::OPT_no_static_stdlib, false) ||
+      getTriple().isOSBinFormatWasm()) {
     Arguments.push_back("-use-static-resource-dir");
   }
 
@@ -1191,6 +1193,14 @@ ToolChain::constructInvocation(const GeneratePCHJobAction &job,
   addInputsOfType(Arguments, context.InputActions, file_types::TY_ObjCHeader);
   context.Args.AddLastArg(Arguments, options::OPT_index_store_path);
 
+  if (context.Args.hasFlag(options::OPT_static_executable,
+                   options::OPT_no_static_executable, false) ||
+      context.Args.hasFlag(options::OPT_static_stdlib, options::OPT_no_static_stdlib,
+                   false) ||
+      getTriple().isOSBinFormatWasm()) {
+    Arguments.push_back("-use-static-resource-dir");
+  }
+
   if (job.isPersistentPCH()) {
     Arguments.push_back("-emit-pch");
     Arguments.push_back("-pch-output-dir");