Initial support for pthreads + dynamic linking

See #3494

emcc.py

@@ -1651,12 +1651,6 @@ def include_and_export(name):
         if not shared.Settings.MINIMAL_RUNTIME:
           shared.Settings.EXPORTED_RUNTIME_METHODS += ['ExitStatus']
 
-      if shared.Settings.LINKABLE:
-        exit_with_error('-s LINKABLE=1 is not supported with -s USE_PTHREADS>0!')
-      if shared.Settings.SIDE_MODULE:
-        exit_with_error('-s SIDE_MODULE=1 is not supported with -s USE_PTHREADS>0!')
-      if shared.Settings.MAIN_MODULE:
-        exit_with_error('-s MAIN_MODULE=1 is not supported with -s USE_PTHREADS>0!')
       if shared.Settings.PROXY_TO_WORKER:
         exit_with_error('--proxy-to-worker is not supported with -s USE_PTHREADS>0! Use the option -s PROXY_TO_PTHREAD=1 if you want to run the main thread of a multithreaded application in a web worker.')
     else:

tests/test_core.py

@@ -8139,6 +8139,10 @@ def test_emscripten_futexes(self):
     self.set_setting('USE_PTHREADS', '1')
     self.do_run_in_out_file_test('tests', 'core', 'pthread', 'emscripten_futexes.c')
 
+  @node_pthreads
+  def test_pthreads_dynamic_linking(self):
+    self.do_basic_dylink_test()
+
   # Tests the emscripten_get_exported_function() API.
   def test_emscripten_get_exported_function(self):
     # Could also test with -s ALLOW_TABLE_GROWTH=1