Issue 2975: when compiling multiple extension modules with visual studio 2008
from the same python instance, some environment variables (LIB, INCLUDE)
would grow without limit.
Tested with these statements:
distutils.ccompiler.new_compiler().initialize()
print os.environ['LIB']
But I don't know how to turn them into reliable unit tests.
diff --git a/Lib/distutils/msvc9compiler.py b/Lib/distutils/msvc9compiler.py
index c8d52c4..0b27428 100644
--- a/Lib/distutils/msvc9compiler.py
+++ b/Lib/distutils/msvc9compiler.py
@@ -193,6 +193,17 @@
reduced_paths.append(np)
return reduced_paths
+def removeDuplicates(variable):
+ """Remove duplicate values of an environment variable.
+ """
+ oldList = variable.split(os.pathsep)
+ newList = []
+ for i in oldList:
+ if i not in newList:
+ newList.append(i)
+ newVariable = os.pathsep.join(newList)
+ return newVariable
+
def find_vcvarsall(version):
"""Find the vcvarsall.bat file
@@ -252,12 +263,12 @@
if '=' not in line:
continue
line = line.strip()
- key, value = line.split('=')
+ key, value = line.split('=', 1)
key = key.lower()
if key in interesting:
if value.endswith(os.pathsep):
value = value[:-1]
- result[key] = value
+ result[key] = removeDuplicates(value)
if len(result) != len(interesting):
raise ValueError(str(list(result.keys())))