Add EMSCRIPTEN_STRICT as a linker setting as well.

Author: juj

emcc.py

@@ -939,7 +939,7 @@ def detect_fixed_language_mode(args):
             if found: break
           if found: break
         if not found and lib not in ['GL', 'GLU', 'glut', 'm', 'c', 'SDL', 'stdc++', 'pthread']: # whitelist our default libraries
-          emscripten_strict_mode = os.environ.get('EMSCRIPTEN_STRICT') and int(os.environ.get('EMSCRIPTEN_STRICT')) != 0
+          emscripten_strict_mode = (os.environ.get('EMSCRIPTEN_STRICT') and int(os.environ.get('EMSCRIPTEN_STRICT')) != 0) or 'EMSCRIPTEN_STRICT=1' in settings_changes
           error_on_missing_libraries = (emscripten_strict_mode and not 'ERROR_ON_MISSING_LIBRARIES=0' in settings_changes) or 'ERROR_ON_MISSING_LIBRARIES=1' in settings_changes
           if error_on_missing_libraries:
             logging.fatal('emcc: cannot find library "%s"', lib)

src/settings.js

@@ -482,6 +482,10 @@ var LINKABLE = 0; // If set to 1, this file can be linked with others, either as
                   // LINKABLE of 0 is very useful in that we can reduce the size of the
                   // generated code very significantly, by removing everything not actually used.
 
+var EMSCRIPTEN_STRICT = 0; // Emscripten 'strict' build mode: Drop supporting any deprecated build options.
+                           // Set the environment variable EMSCRIPTEN_STRICT=1 or pass -s EMSCRIPTEN_STRICT=1
+                           // to test that a codebase builds nicely in forward compatible manner.
+
 var WARN_ON_UNDEFINED_SYMBOLS = 1; // If set to 1, we will warn on any undefined symbols that
                                    // are not resolved by the library_*.js files. Note that
                                    // it is common in large projects to

tools/shared.py

@@ -1115,7 +1115,8 @@ def load(self, args=[]):
 
       # Apply default values for settings that are configured from environment variables.
       if os.environ.get('EMSCRIPTEN_STRICT') and int(os.environ.get('EMSCRIPTEN_STRICT')) != 0:
-        # The default value -s ERROR_ON_UNDEFINED_SYMBOLS=0 is deprecated. Use the default value 1 in strict mode.
+        # Specify default values for Emscripten strict mode.
+        self.attrs['EMSCRIPTEN_STRICT'] = 1
         self.attrs['ERROR_ON_UNDEFINED_SYMBOLS'] = 1
         self.attrs['ERROR_ON_MISSING_LIBRARIES'] = 1