Adds monkeypatching for msvc9compiler.find_vcvarsall() to look for a standalone compiler installation and improves the error message for missing VC installation.

1 files changed, 54 insertions, 0 deletions

diff --git a/setuptools/extension.py b/setuptools/extension.py
index ab5908da..41a817b7 100644
--- a/setuptools/extension.py
+++ b/setuptools/extension.py
@@ -2,12 +2,66 @@ import sys
 import re
 import functools
 import distutils.core
+import distutils.errors
 import distutils.extension
+import distutils.msvc9compiler
 
 from setuptools.dist import _get_unpatched
 
 _Extension = _get_unpatched(distutils.core.Extension)
 
+def _patch_msvc9compiler_find_vcvarsall():
+    """
+    Looks for the standalone VC for Python before falling back on
+    distutils's original approach.
+    """
+    VC_BASE = r'Software\%sMicrosoft\DevDiv\VCForPython\%0.1f'
+    find_vcvarsall = distutils.msvc9compiler.find_vcvarsall
+    query_vcvarsall = distutils.msvc9compiler.query_vcvarsall
+    if find_vcvarsall and find_vcvarsall.__module__.startswith('setuptools.'):
+        # Already patched
+        return
+    
+    def _find_vcvarsall(version):
+        Reg = distutils.msvc9compiler.Reg
+        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 find_vcvarsall(version)
+    
+    def _query_vcvarsall(version, *args, **kwargs):
+        try:
+            return 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
+
+    distutils.msvc9compiler.find_vcvarsall = _find_vcvarsall
+    distutils.msvc9compiler.query_vcvarsall = _query_vcvarsall
+_patch_msvc9compiler_find_vcvarsall()
+
 def have_pyrex():
     """
     Return True if Cython or Pyrex can be imported.