Ensure logging gets configured early on. NFC (#14979)

Otherwise, message from config.py that are logged during startup
are not effected by EMCC_DEBUG=1.

Author: sbc100

tools/config.py

@@ -10,7 +10,7 @@
 from . import utils
 from .utils import path_from_root, exit_with_error, __rootpath__, which
 
-logger = logging.getLogger('shared')
+logger = logging.getLogger('config')
 
 # The following class can be overridden by the config file and/or
 # environment variables.  Specifically any variable whose name

tools/shared.py

@@ -25,29 +25,33 @@
   print('error: emscripten requires python 3.6 or above', file=sys.stderr)
   sys.exit(1)
 
+from . import colored_logger
+
+# Configure logging before importing any other local modules so even
+# log message during import are shown as expected.
+DEBUG = int(os.environ.get('EMCC_DEBUG', '0'))
+# can add  %(asctime)s  to see timestamps
+logging.basicConfig(format='%(name)s:%(levelname)s: %(message)s',
+                    level=logging.DEBUG if DEBUG else logging.INFO)
+colored_logger.enable()
+
 from .tempfiles import try_delete
 from .utils import path_from_root, exit_with_error, safe_ensure_dirs, WINDOWS
-from . import cache, tempfiles, colored_logger
+from . import cache, tempfiles
 from . import diagnostics
 from . import config
 from . import filelock
 from . import utils
 from .settings import settings
 
 
-DEBUG = int(os.environ.get('EMCC_DEBUG', '0'))
 DEBUG_SAVE = DEBUG or int(os.environ.get('EMCC_DEBUG_SAVE', '0'))
 EXPECTED_NODE_VERSION = (4, 1, 1)
 EXPECTED_LLVM_VERSION = "14.0"
 PYTHON = sys.executable
 
 # Used only when EM_PYTHON_MULTIPROCESSING=1 env. var is set.
 multiprocessing_pool = None
-
-# can add  %(asctime)s  to see timestamps
-logging.basicConfig(format='%(name)s:%(levelname)s: %(message)s',
-                    level=logging.DEBUG if DEBUG else logging.INFO)
-colored_logger.enable()
 logger = logging.getLogger('shared')
 
 # warning about absolute-paths is disabled by default, and not enabled by -Wall