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@@ -7,6 +7,7 @@ utils for building wxpy or wxpy extensions
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 from __future__ import with_statement
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 import itertools
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+import os
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 import shutil
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 import sipconfig
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 import sipdistutils
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@@ -117,15 +118,16 @@ def make_sip_ext(name, iface_files, include = None, libs = []):
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     ext = Extension(name, iface_files, extra_compile_args = cargs, extra_link_args = largs)
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     ext.extra_sip_includes = includes
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-    # HACK! disutils wants to include /DNDEBUG but we
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-    # are using __WXDEBUG__, which needs it
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-    from distutils.msvc9compiler import MSVCCompiler
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-    old_initialize = MSVCCompiler.initialize
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-    def new_initialize(self, plat_name=None):
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-        res = old_initialize(self, plat_name)
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-        if '/DNDEBUG' in self.compile_options:
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-            self.compile_options.remove('/DNDEBUG')
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-        return res
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-    MSVCCompiler.initialize = new_initialize
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+    if os.name == 'nt':
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+        # HACK! disutils wants to include /DNDEBUG but we
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+        # are using __WXDEBUG__, which needs it
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+        from distutils.msvc9compiler import MSVCCompiler
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+        old_initialize = MSVCCompiler.initialize
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+        def new_initialize(self, plat_name=None):
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+            res = old_initialize(self, plat_name)
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+            if '/DNDEBUG' in self.compile_options:
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+                self.compile_options.remove('/DNDEBUG')
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+            return res
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+        MSVCCompiler.initialize = new_initialize
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     return ext