.

emcc.py

@@ -2921,6 +2921,7 @@ def consume_arg_file():
       options.no_entry = True
     elif check_arg('--js-library'):
       settings.JS_LIBRARIES.append((i + 1, os.path.abspath(consume_arg_file())))
+      settings.USER_JS_LIBRARIES.append(os.path.abspath(consume_arg_file()))
     elif check_flag('--remove-duplicates'):
       diagnostics.warning('legacy-settings', '--remove-duplicates is deprecated as it is no longer needed. If you cannot link without it, file a bug with a testcase')
     elif check_flag('--jcache'):

src/settings_internal.js

@@ -94,6 +94,9 @@ var WASI_MODULE_NAME = "wasi_snapshot_preview1";
 // added by the JS compiler.
 var JS_LIBRARIES = [];
 
+// Libraries specified via --js-library command line
+var USER_JS_LIBRARIES = [];
+
 // This will contain the emscripten version. This can be useful in combination
 // with RETAIN_COMPILER_SETTINGS
 var EMSCRIPTEN_VERSION = '';

tests/test_other.py

@@ -6153,6 +6153,15 @@ def test_js_lib_to_system_lib(self):
     self.run_process([EMXX, 'test.cpp', '--js-library', 'lib.js', '-s', 'EXPORTED_FUNCTIONS=_main,_memset'])
     self.assertContained('dddddddddd', self.run_js('a.out.js'))
 
+  def test_js_lib_internal_settings(self):
+    self.assertContained('var EMBIND =', open(path_from_root('src/settings_internal.js')).read())
+    create_file('lib.js', r'''
+#if EMBIND
+#endif
+''')
+    err = self.expect_fail([EMCC, test_file('hello_world.c'), '-o', 'out.js', '--js-library', 'lib.js'])
+    self.assertContained('ReferenceError: EMBIND is not defined', err)
+
   def test_realpath(self):
     create_file('src.c', r'''
 #include <stdlib.h>