Enable emcc -print-resource-dir (#21988)

Author: sbc100

emcc.py

@@ -619,6 +619,10 @@ def run(args):
     print(f'libraries: ={cache.get_lib_dir(absolute=True)}')
     return 0
 
+  if '-print-resource-dir' in newargs:
+    shared.check_call([clang] + newargs)
+    return 0
+
   if '-print-libgcc-file-name' in newargs or '--print-libgcc-file-name' in newargs:
     settings.limit_settings(None)
     compiler_rt = system_libs.Library.get_usable_variations()['libcompiler_rt']

test/test_other.py

@@ -818,6 +818,14 @@ def test_print_libgcc_file_name(self, args):
     expected = os.path.join(libdir, 'libcompiler_rt.a')
     self.assertEqual(output.strip(), expected)
 
+  def test_print_resource_dir(self):
+    output = self.run_process([EMCC, '-print-resource-dir'], stdout=PIPE).stdout
+    print(output)
+    lines = output.strip().splitlines()
+    self.assertEqual(len(lines), 1)
+    resource_dir = lines[0]
+    self.assertContained(os.path.dirname(config.LLVM_ROOT), resource_dir)
+
   @crossplatform
   @parameterized({
     '': [[]],