[test] Use cflags rather than emcc_args. NFC

This has a few advantages:

1. It paves the way for separating out `ldflags`.
2. It the commonly used name for compiler flags.
3. Its slightly short and easier to type (important only
   because its repeated in many places)

Author: sbc100

test/common.py

@@ -977,7 +977,7 @@ def output_parser(output):
     self.do_benchmark('matrix_multiply', read_file(test_file('matrix_multiply.cpp')), 'Total elapsed:', output_parser=output_parser, shared_args=['-I' + test_file('benchmark')])
 
   def lua(self, benchmark, expected, output_parser=None, args_processor=None):
-    self.emcc_args.remove('-Werror')
+    self.cflags.remove('-Werror')
     shutil.copyfile(test_file(f'third_party/lua/{benchmark}.lua'), benchmark + '.lua')
 
     def lib_builder(name, native, env_init):
@@ -1002,7 +1002,7 @@ def test_zzz_lua_binarytrees(self):
     self.lua('binarytrees', 'long lived tree of depth')
 
   def test_zzz_zlib(self):
-    self.emcc_args.remove('-Werror')
+    self.cflags.remove('-Werror')
     src = read_file(test_file('benchmark/test_zlib_benchmark.c'))
 
     def lib_builder(name, native, env_init):
@@ -1032,8 +1032,8 @@ def lib_builder(name, native, env_init):
     self.do_benchmark('box2d', src, 'frame averages', shared_args=['-I' + test_file('third_party/box2d')], lib_builder=lib_builder)
 
   def test_zzz_bullet(self):
-    self.emcc_args.remove('-Werror')
-    self.emcc_args += ['-Wno-c++11-narrowing', '-Wno-deprecated-register', '-Wno-writable-strings']
+    self.cflags.remove('-Werror')
+    self.cflags += ['-Wno-c++11-narrowing', '-Wno-deprecated-register', '-Wno-writable-strings']
     src = read_file(test_file('third_party/bullet/Demos/Benchmarks/BenchmarkDemo.cpp'))
     src += read_file(test_file('third_party/bullet/Demos/Benchmarks/main.cpp'))
 

test/test_benchmark.py

@@ -172,7 +172,7 @@ def f(self):
     if browser:
       self.btest_exit(testfile, args=args)
     else:
-      self.do_runf(testfile, emcc_args=args, output_basename=name)
+      self.do_runf(testfile, cflags=args, output_basename=name)
 
   if name in expect_fail:
     f = unittest.expectedFailure(f)

test/test_browser.py

@@ -158,7 +158,7 @@ def PythonTcpEchoServerProcess(port):
 
 
 class sockets(BrowserCore):
-  emcc_args: List[str] = []
+  cflags: List[str] = []
 
   @classmethod
   def setUpClass(cls):
@@ -185,15 +185,15 @@ def test_sockets_echo(self, harness_class, port, args):
       self.skipTest('requires native clang')
 
     with harness_class(test_file('sockets/test_sockets_echo_server.c'), args, port) as harness:
-      self.btest_exit('sockets/test_sockets_echo_client.c', emcc_args=['-DSOCKK=%d' % harness.listen_port] + args)
+      self.btest_exit('sockets/test_sockets_echo_client.c', cflags=['-DSOCKK=%d' % harness.listen_port] + args)
 
   def test_sockets_echo_pthreads(self):
     with CompiledServerHarness(test_file('sockets/test_sockets_echo_server.c'), [], 49161) as harness:
-      self.btest_exit('sockets/test_sockets_echo_client.c', emcc_args=['-pthread', '-sPROXY_TO_PTHREAD', '-DSOCKK=%d' % harness.listen_port])
+      self.btest_exit('sockets/test_sockets_echo_client.c', cflags=['-pthread', '-sPROXY_TO_PTHREAD', '-DSOCKK=%d' % harness.listen_port])
 
   def test_sdl2_sockets_echo(self):
     with CompiledServerHarness('sockets/sdl2_net_server.c', ['-sUSE_SDL=2', '-sUSE_SDL_NET=2'], 49164) as harness:
-      self.btest_exit('sockets/sdl2_net_client.c', emcc_args=['-sUSE_SDL=2', '-sUSE_SDL_NET=2', '-DSOCKK=%d' % harness.listen_port])
+      self.btest_exit('sockets/sdl2_net_client.c', cflags=['-sUSE_SDL=2', '-sUSE_SDL_NET=2', '-DSOCKK=%d' % harness.listen_port])
 
   @parameterized({
     'websockify': [WebsockifyServerHarness, 49166, ['-DTEST_DGRAM=0']],
@@ -208,12 +208,12 @@ def test_sockets_async_echo(self, harness_class, port, args):
 
     args.append('-DTEST_ASYNC=1')
     with harness_class(test_file('sockets/test_sockets_echo_server.c'), args, port) as harness:
-      self.btest_exit('sockets/test_sockets_echo_client.c', emcc_args=['-DSOCKK=%d' % harness.listen_port] + args)
+      self.btest_exit('sockets/test_sockets_echo_client.c', cflags=['-DSOCKK=%d' % harness.listen_port] + args)
 
   def test_sockets_async_bad_port(self):
     # Deliberately attempt a connection on a port that will fail to test the error callback and
     # getsockopt
-    self.btest_exit('sockets/test_sockets_echo_client.c', emcc_args=['-DSOCKK=49169', '-DTEST_ASYNC=1'])
+    self.btest_exit('sockets/test_sockets_echo_client.c', cflags=['-DSOCKK=49169', '-DTEST_ASYNC=1'])
 
   @parameterized({
     'websockify': [WebsockifyServerHarness, 49171, ['-DTEST_DGRAM=0']],
@@ -235,7 +235,7 @@ def test_sockets_echo_bigdata(self, harness_class, port, args):
     create_file('test_sockets_echo_bigdata.c', src.replace('#define MESSAGE "pingtothepong"', '#define MESSAGE "%s"' % message))
 
     with harness_class(test_file('sockets/test_sockets_echo_server.c'), args, port) as harness:
-      self.btest_exit('test_sockets_echo_bigdata.c', emcc_args=[sockets_include, '-DSOCKK=%d' % harness.listen_port] + args)
+      self.btest_exit('test_sockets_echo_bigdata.c', cflags=[sockets_include, '-DSOCKK=%d' % harness.listen_port] + args)
 
   @no_windows('This test is Unix-specific.')
   def test_sockets_partial(self):
@@ -244,7 +244,7 @@ def test_sockets_partial(self):
       CompiledServerHarness(test_file('sockets/test_sockets_partial_server.c'), [], 49181),
     ]:
       with harness:
-        self.btest_exit('sockets/test_sockets_partial_client.c', assert_returncode=165, emcc_args=['-DSOCKK=%d' % harness.listen_port])
+        self.btest_exit('sockets/test_sockets_partial_client.c', assert_returncode=165, cflags=['-DSOCKK=%d' % harness.listen_port])
 
   @no_windows('This test is Unix-specific.')
   def test_sockets_select_server_down(self):
@@ -253,7 +253,7 @@ def test_sockets_select_server_down(self):
       CompiledServerHarness(test_file('sockets/test_sockets_select_server_down_server.c'), [], 49191),
     ]:
       with harness:
-        self.btest_exit('sockets/test_sockets_select_server_down_client.c', emcc_args=['-DSOCKK=%d' % harness.listen_port])
+        self.btest_exit('sockets/test_sockets_select_server_down_client.c', cflags=['-DSOCKK=%d' % harness.listen_port])
 
   @no_windows('This test is Unix-specific.')
   def test_sockets_select_server_closes_connection_rw(self):
@@ -262,7 +262,7 @@ def test_sockets_select_server_closes_connection_rw(self):
       CompiledServerHarness(test_file('sockets/test_sockets_echo_server.c'), ['-DCLOSE_CLIENT_AFTER_ECHO'], 49201),
     ]:
       with harness:
-        self.btest_exit('sockets/test_sockets_select_server_closes_connection_client_rw.c', emcc_args=['-DSOCKK=%d' % harness.listen_port])
+        self.btest_exit('sockets/test_sockets_select_server_closes_connection_client_rw.c', cflags=['-DSOCKK=%d' % harness.listen_port])
 
   @no_windows('This test uses Unix-specific build architecture.')
   def test_enet(self):
@@ -274,7 +274,7 @@ def test_enet(self):
       enet = [self.in_dir('enet', '.libs', 'libenet.a'), '-I' + self.in_dir('enet', 'include')]
 
     with CompiledServerHarness(test_file('sockets/test_enet_server.c'), enet, 49210) as harness:
-      self.btest_exit('sockets/test_enet_client.c', emcc_args=enet + ['-DSOCKK=%d' % harness.listen_port])
+      self.btest_exit('sockets/test_enet_client.c', cflags=enet + ['-DSOCKK=%d' % harness.listen_port])
 
   @crossplatform
   @parameterized({
@@ -290,10 +290,10 @@ def test_nodejs_sockets_echo(self, harness_class, port, args):
     # Basic test of node client against both a Websockified and compiled echo server.
     with harness_class(test_file('sockets/test_sockets_echo_server.c'), args, port) as harness:
       expected = 'do_msg_read: read 14 bytes'
-      self.do_runf('sockets/test_sockets_echo_client.c', expected, emcc_args=['-DSOCKK=%d' % harness.listen_port] + args)
+      self.do_runf('sockets/test_sockets_echo_client.c', expected, cflags=['-DSOCKK=%d' % harness.listen_port] + args)
 
   def test_nodejs_sockets_connect_failure(self):
-    self.do_runf('sockets/test_sockets_echo_client.c', 'connect failed: Connection refused', emcc_args=['-DSOCKK=666'], assert_returncode=NON_ZERO)
+    self.do_runf('sockets/test_sockets_echo_client.c', 'connect failed: Connection refused', cflags=['-DSOCKK=666'], assert_returncode=NON_ZERO)
 
   @requires_native_clang
   def test_nodejs_sockets_echo_subprotocol(self):
@@ -336,7 +336,7 @@ def test_nodejs_sockets_echo_subprotocol_runtime(self):
   })
   def test_websocket_send(self, args):
     with NodeJsWebSocketEchoServerProcess():
-      self.btest_exit('websocket/test_websocket_send.c', emcc_args=['-lwebsocket', '-sNO_EXIT_RUNTIME', '-sWEBSOCKET_DEBUG'] + args)
+      self.btest_exit('websocket/test_websocket_send.c', cflags=['-lwebsocket', '-sNO_EXIT_RUNTIME', '-sWEBSOCKET_DEBUG'] + args)
 
   # Test that native POSIX sockets API can be used by proxying calls to an intermediate WebSockets
   # -> POSIX sockets bridge server
@@ -352,17 +352,17 @@ def test_posix_proxy_sockets(self):
     with BackgroundServerProcess([proxy_server, '8080']):
       with PythonTcpEchoServerProcess('7777'):
         # Build and run the TCP echo client program with Emscripten
-        self.btest_exit('websocket/tcp_echo_client.c', emcc_args=['-lwebsocket', '-sPROXY_POSIX_SOCKETS', '-pthread', '-sPROXY_TO_PTHREAD'])
+        self.btest_exit('websocket/tcp_echo_client.c', cflags=['-lwebsocket', '-sPROXY_POSIX_SOCKETS', '-pthread', '-sPROXY_TO_PTHREAD'])
 
   # Test that calling send() right after a socket connect() works.
   def test_sockets_send_while_connecting(self):
     with NodeJsWebSocketEchoServerProcess():
-      self.btest('sockets/test_sockets_send_while_connecting.c', emcc_args=['-DSOCKET_DEBUG'], expected='0')
+      self.btest('sockets/test_sockets_send_while_connecting.c', cflags=['-DSOCKET_DEBUG'], expected='0')
 
 
 class sockets64(sockets):
   def setUp(self):
     super().setUp()
     self.set_setting('MEMORY64')
-    self.emcc_args.append('-Wno-experimental')
+    self.cflags.append('-Wno-experimental')
     self.require_wasm64()