Issue #21923: Prevent AttributeError in distutils.sysconfig.customize_compiler
due to possible uninitialized _config_vars. Original patch by Alex Gaynor.
diff --git a/Lib/distutils/sysconfig.py b/Lib/distutils/sysconfig.py
index 75537db..5b94fa2 100644
--- a/Lib/distutils/sysconfig.py
+++ b/Lib/distutils/sysconfig.py
@@ -179,7 +179,8 @@
# version and build tools may not support the same set
# of CPU architectures for universal builds.
global _config_vars
- if not _config_vars.get('CUSTOMIZED_OSX_COMPILER', ''):
+ # Use get_config_var() to ensure _config_vars is initialized.
+ if not get_config_var('CUSTOMIZED_OSX_COMPILER'):
import _osx_support
_osx_support.customize_compiler(_config_vars)
_config_vars['CUSTOMIZED_OSX_COMPILER'] = 'True'