bpo-38809: Windows build scripts use python.exe from virtual envs (GH-17164)
https://bugs.python.org/issue38809
(cherry picked from commit ee703cbb418b7458bebb1d26a5e19d6b55280b28)
Co-authored-by: Tal Einat <taleinat+github@gmail.com>
diff --git a/Misc/NEWS.d/next/Build/2019-11-15-09-25-44.bpo-38809.9jwta6.rst b/Misc/NEWS.d/next/Build/2019-11-15-09-25-44.bpo-38809.9jwta6.rst
new file mode 100644
index 0000000..10eaf84
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2019-11-15-09-25-44.bpo-38809.9jwta6.rst
@@ -0,0 +1,2 @@
+On Windows, build scripts will now recognize and use python.exe from an
+active virtual env.
diff --git a/PCbuild/find_python.bat b/PCbuild/find_python.bat
index d5c787f..40937a6 100644
--- a/PCbuild/find_python.bat
+++ b/PCbuild/find_python.bat
@@ -24,6 +24,9 @@
:begin_search
@set PYTHON=
+@rem If there is an active virtual env, use that one
+@if NOT "%VIRTUAL_ENV%"=="" (set PYTHON="%VIRTUAL_ENV%\Scripts\python.exe") & (set _Py_Python_Source=found in virtual env) & goto :found
+
@set _Py_EXTERNALS_DIR=%EXTERNALS_DIR%
@if "%_Py_EXTERNALS_DIR%"=="" (set _Py_EXTERNALS_DIR=%~dp0\..\externals)