From 9b64ef3ac7b434065dbff0048b9103999e4b491a Mon Sep 17 00:00:00 2001
From: Anthony Shaw <anthony.p.shaw@gmail.com>
Date: Wed, 29 Apr 2020 19:09:09 +1000
Subject: bpo-40432 Fix MSBuild project for Pegen grammars (#GH-9785)

* Update the source path of the pegen target within the Windows regen project.
Change the path to Windows path formats.

* Use the more reliable SetEnv task for Cpp Projects in MSBuild.
---
 PCbuild/regen.vcxproj | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/PCbuild/regen.vcxproj b/PCbuild/regen.vcxproj
index 285a8a1..c97536f 100644
--- a/PCbuild/regen.vcxproj
+++ b/PCbuild/regen.vcxproj
@@ -168,7 +168,8 @@
   </Target>
   <Target Name="_RegenPegen" BeforeTargets="Build">
     <!-- Regenerate Parser/pegen/parse.c -->
-    <Exec Command="&quot;$PYTHONPATH=$(srcdir)/Tools/peg_generator&quot; &quot;$(PythonExe)&quot; -m pegen -q c &quot;$(PySourcePath)Grammar\python.gram&quot; &quot;$(PySourcePath)Grammar\Tokens&quot; -o &quot;$(IntDir)parse.c&quot;" />
+    <SetEnv Name="PYTHONPATH" Prefix="true" Value="$(PySourcePath)Tools\peg_generator\" />
+    <Exec Command="&quot;$(PythonExe)&quot; -m pegen -q c &quot;$(PySourcePath)Grammar\python.gram&quot; &quot;$(PySourcePath)Grammar\Tokens&quot; -o &quot;$(IntDir)parse.c&quot;" />
     <Copy SourceFiles="$(IntDir)parse.c" DestinationFiles="$(PySourcePath)Parser\pegen\parse.c">
       <Output TaskParameter="CopiedFiles" ItemName="_UpdatedParse" />
     </Copy>
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