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import sys
distutils = None
unpatched = dict()
def patch_for_specialized_compiler():
"""
Patch functions in distutils.msvc9compiler to use the standalone compiler
build for Python (Windows only). Fall back to original behavior when the
standalone compiler is not available.
"""
global distutils
try:
distutils = __import__('distutils.msvc9compiler')
except ImportError:
# The module isn't available to be patched
return
if unpatched:
# Already patched
return
unpatched.update(vars(distutils.msvc9compiler))
distutils.msvc9compiler.find_vcvarsall = find_vcvarsall
distutils.msvc9compiler.query_vcvarsall = query_vcvarsall
def find_vcvarsall(version):
Reg = distutils.msvc9compiler.Reg
VC_BASE = r'Software\%sMicrosoft\DevDiv\VCForPython\%0.1f'
try:
# Per-user installs register the compiler path here
productdir = Reg.get_value(VC_BASE % ('', version), "installdir")
except KeyError:
try:
# All-user installs on a 64-bit system register here
productdir = Reg.get_value(VC_BASE % ('Wow6432Node\\', version), "installdir")
except KeyError:
productdir = None
if productdir:
import os
vcvarsall = os.path.join(productdir, "vcvarsall.bat")
if os.path.isfile(vcvarsall):
return vcvarsall
return unpatched['find_vcvarsall'](version)
def query_vcvarsall(version, *args, **kwargs):
try:
return unpatched['query_vcvarsall'](version, *args, **kwargs)
except distutils.errors.DistutilsPlatformError:
exc = sys.exc_info()[1]
if exc and "vcvarsall.bat" in exc.args[0]:
message = 'Microsoft Visual C++ %0.1f is required (%s).' % (version, exc.args[0])
if int(version) == 9:
# This redirection link is maintained by Microsoft.
# Contact vspython@microsoft.com if it needs updating.
raise distutils.errors.DistutilsPlatformError(
message + ' Get it from http://aka.ms/vcpython27'
)
raise distutils.errors.DistutilsPlatformError(message)
raise
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