Fix MAIN_MODULE=1 + STRICT (#22446)

Fixes: #22435

test/test_other.py

@@ -2030,6 +2030,9 @@ def test_exclude_file(self):
     self.run_process([EMCC, 'main.c', '--embed-file', 'tst', '--exclude-file', '*.exe'])
     self.assertEqual(self.run_js('a.out.js').strip(), '')
 
+  def test_dylink_strict(self):
+    self.do_runf('hello_world.c', 'hello, world!', emcc_args=['-sSTRICT', '-sMAIN_MODULE=1'])
+
   def test_dylink_exceptions_and_assetions(self):
     # Linking side modules using the STL and exceptions should not abort with
     # "function in Table but not functionsInTableMap" when using ASSERTIONS=2

tools/link.py

@@ -896,10 +896,13 @@ def phase_linker_setup(options, state, newargs):
     if not settings.MODULARIZE and not settings.EXPORT_ES6:
       default_setting('STRICT_JS', 1)
     default_setting('DEFAULT_TO_CXX', 0)
-    default_setting('AUTO_JS_LIBRARIES', 0)
-    default_setting('AUTO_NATIVE_LIBRARIES', 0)
     default_setting('IGNORE_MISSING_MAIN', 0)
-    default_setting('ALLOW_UNIMPLEMENTED_SYSCALLS', 0)
+    default_setting('AUTO_NATIVE_LIBRARIES', 0)
+    if settings.MAIN_MODULE != 1:
+      # These two settings cannot be disabled with MAIN_MODULE=1 because all symbols
+      # are needed in this mode.
+      default_setting('AUTO_JS_LIBRARIES', 0)
+      default_setting('ALLOW_UNIMPLEMENTED_SYSCALLS', 0)
     if options.oformat == OFormat.HTML and options.shell_path == DEFAULT_SHELL_HTML:
       # Out default shell.html file has minimal set of INCOMING_MODULE_JS_API elements that it expects
       default_setting('INCOMING_MODULE_JS_API', 'canvas,monitorRunDependencies,onAbort,onExit,print,setStatus'.split(','))