Issue #14499: Fix several problems with OS X universal build support:
1. ppc arch detection for extension module builds broke with Xcode 5
2. ppc arch detection in configure did not work on OS X 10.4
3. -sysroot and -arch flags were unnecessarily duplicated
4. there was no obvious way to configure an intel-32 only build.
diff --git a/Lib/_osx_support.py b/Lib/_osx_support.py
index 3c11943..40fc78b 100644
--- a/Lib/_osx_support.py
+++ b/Lib/_osx_support.py
@@ -235,13 +235,19 @@
if re.search('-arch\s+ppc', _config_vars['CFLAGS']) is not None:
# NOTE: Cannot use subprocess here because of bootstrap
# issues when building Python itself
- status = os.system("'%s' -arch ppc -x c /dev/null 2>/dev/null"%(
- _config_vars['CC'].replace("'", "'\"'\"'"),))
- # The Apple compiler drivers return status 255 if no PPC
- if (status >> 8) == 255:
- # Compiler doesn't support PPC, remove the related
- # '-arch' flags if not explicitly overridden by an
- # environment variable
+ status = os.system(
+ """echo 'int main{};' | """
+ """'%s' -c -arch ppc -x c -o /dev/null /dev/null 2>/dev/null"""
+ %(_config_vars['CC'].replace("'", "'\"'\"'"),))
+ if status:
+ # The compile failed for some reason. Because of differences
+ # across Xcode and compiler versions, there is no reliable way
+ # to be sure why it failed. Assume here it was due to lack of
+ # PPC support and remove the related '-arch' flags from each
+ # config variables not explicitly overriden by an environment
+ # variable. If the error was for some other reason, we hope the
+ # failure will show up again when trying to compile an extension
+ # module.
for cv in _UNIVERSAL_CONFIG_VARS:
if cv in _config_vars and cv not in os.environ:
flags = _config_vars[cv]