Drop malloc impl if building with USES_DYNAMIC_ALLOC=0

Author: juj

emcc.py

@@ -1286,6 +1286,10 @@ def is_supported_link_flag(f):
       shared.Settings.FETCH = 1
       shared.Settings.SYSTEM_JS_LIBRARIES.append(shared.path_from_root('src', 'library_asmfs.js'))
 
+    # Explicitly drop linking in a malloc implementation if program is not using any dynamic allocation calls.
+    if not shared.Settings.USES_DYNAMIC_ALLOC:
+      shared.Settings.MALLOC = 'none'
+
     if shared.Settings.MALLOC == 'emmalloc':
       shared.Settings.SYSTEM_JS_LIBRARIES.append(shared.path_from_root('src', 'library_emmalloc.js'))
 

tests/test_other.py

@@ -9559,7 +9559,7 @@ def test_minimal_runtime_code_size(self):
                            path_from_root('tests', 'minimal_webgl', 'webgl.c'),
                            '--js-library', path_from_root('tests', 'minimal_webgl', 'library_js.js'),
                            '-s', 'RUNTIME_FUNCS_TO_IMPORT=[]',
-                           '-s', 'USES_DYNAMIC_ALLOC=2', '-lGL',
+                           '-s', 'USES_DYNAMIC_ALLOC=1', '-lGL',
                            '-s', 'MODULARIZE=1']
     hello_webgl2_sources = hello_webgl_sources + ['-s', 'MAX_WEBGL_VERSION=2']