Issue 5062 - [emscripten] Allow generation of custom bindings code

compile

Index: compile
===================================================================
--- a/compile
+++ b/compile
@@ -23,17 +23,16 @@ import sys
 BASE_DIR = os.path.dirname(__file__)
 SOURCE_DIR = os.path.join(BASE_DIR, 'compiled')
 SOURCE_FILES = [
     os.path.join(path, f)
     for (path, dirs, files) in os.walk(SOURCE_DIR)
     for f in files
     if f.endswith('.cpp')
 ]
-BINDINGS_FILE = os.path.join(SOURCE_DIR, 'bindings.cpp')
 BINDINGS_GENERATOR = os.path.join(SOURCE_DIR, 'bindings.cpp.js')
 BINDINGS_OUTPUT = os.path.join(SOURCE_DIR, 'bindings.js')
 COMPILER_OUTPUT = os.path.join(BASE_DIR, 'lib', 'compiled.js')
 GENERATION_PARAMS = {
     'SHELL_FILE': "'{}'".format(os.path.abspath(os.path.join(SOURCE_DIR,
                                                              'shell.js'))),
     'ASM_JS': 2,  # "almost asm"
     'TOTAL_MEMORY': 16*1024*1024,
@@ -61,20 +60,19 @@ def getenv(emscripten_config):
         'PYTHON': scope.get('PYTHON', sys.executable),
         'NODE_JS': scope.get('NODE_JS', 'node'),
     })
     return env
 
 
 def generate_bindings(env):
     params = [
-        env['PYTHON'], os.path.join(env['EMSCRIPTEN'], 'emcc'), BINDINGS_FILE,
+        env['PYTHON'], os.path.join(env['EMSCRIPTEN'], 'emcc'),
         '-o', BINDINGS_GENERATOR, '-std=gnu++14', '-DPRINT_BINDINGS',
-        '-s', 'WARN_ON_UNDEFINED_SYMBOLS=0',
-    ]
+    ] + SOURCE_FILES
     subprocess.check_call(params, env=env)
 
     with open(BINDINGS_OUTPUT, 'w') as file:
         subprocess.check_call([env['NODE_JS'], BINDINGS_GENERATOR],
                               stdout=file)
 
 
 def run_compiler(env, debug=False, tracing=False):