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Issue #13590: On OS X 10.7 and 10.6 with Xcode 4.2, building 

Distutils-based packages with C extension modules may fail because
Apple has removed gcc-4.2, the version used to build python.org
64-bit/32-bit Pythons.  If the user does not explicitly override
the default C compiler by setting the CC environment variable,
Distutils will now attempt to compile extension modules with clang
if gcc-4.2 is required but not found. Also as a convenience, if
the user does explicitly set CC, substitute its value as the default
compiler in the Distutils LDSHARED configuration variable for OS X.
(Note, the python.org 32-bit-only Pythons use gcc-4.0 and the 10.4u
SDK, neither of which are available in Xcode 4.  This change does not
attempt to override settings to support their use with Xcode 4.)
This commit is contained in:
Ned Deily 2012-02-10 12:59:06 +01:00
parent 4ad7f7f31a
commit 0d0ea48709
2 changed files with 45 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
Lib/distutils/sysconfig.py
View File

@ -141,6 +141,7 @@ def get_python_lib(plat_specific=0, standard_lib=0, prefix=None):
"I don't know where Python installs its library "
"on platform '%s'" % os.name)
_USE_CLANG = None
def customize_compiler(compiler):
"""Do any platform-specific customization of a CCompiler instance.
@ -153,8 +154,38 @@ def customize_compiler(compiler):
get_config_vars('CC', 'CXX', 'OPT', 'CFLAGS',
'CCSHARED', 'LDSHARED', 'SO')
newcc = None
if 'CC' in os.environ:
cc = os.environ['CC']
newcc = os.environ['CC']
elif sys.platform == 'darwin' and cc == 'gcc-4.2':
# Issue #13590:
# Since Apple removed gcc-4.2 in Xcode 4.2, we can no
# longer assume it is available for extension module builds.
# If Python was built with gcc-4.2, check first to see if
# it is available on this system; if not, try to use clang
# instead unless the caller explicitly set CC.
global _USE_CLANG
if _USE_CLANG is None:
from distutils import log
from subprocess import Popen, PIPE
p = Popen("! type gcc-4.2 && type clang && exit 2",
shell=True, stdout=PIPE, stderr=PIPE)
p.wait()
if p.returncode == 2:
_USE_CLANG = True
log.warn("gcc-4.2 not found, using clang instead")
else:
_USE_CLANG = False
if _USE_CLANG:
newcc = 'clang'
if newcc:
# On OS X, if CC is overridden, use that as the default
# command for LDSHARED as well
if (sys.platform == 'darwin'
and 'LDSHARED' not in os.environ
and ldshared.startswith(cc)):
ldshared = newcc + ldshared[len(cc):]
cc = newcc
if 'CXX' in os.environ:
cxx = os.environ['CXX']
if 'LDSHARED' in os.environ:

13
Misc/NEWS
View File

@ -90,6 +90,19 @@ Core and Builtins
Library
-------
- Issue #13590: On OS X 10.7 and 10.6 with Xcode 4.2, building
Distutils-based packages with C extension modules may fail because
Apple has removed gcc-4.2, the version used to build python.org
64-bit/32-bit Pythons. If the user does not explicitly override
the default C compiler by setting the CC environment variable,
Distutils will now attempt to compile extension modules with clang
if gcc-4.2 is required but not found. Also as a convenience, if
the user does explicitly set CC, substitute its value as the default
compiler in the Distutils LDSHARED configuration variable for OS X.
(Note, the python.org 32-bit-only Pythons use gcc-4.0 and the 10.4u
SDK, neither of which are available in Xcode 4. This change does not
attempt to override settings to support their use with Xcode 4.)
- Issue #9021: Add an introduction to the copy module documentation.
- Issue #6005: Examples in the socket library documentation use sendall, where