Add PROGRAM environment variables on Windows

CONTRIBUTORS

@@ -55,6 +55,7 @@ Isaac Pedisich
 Itxaka Serrano
 Jake Windle
 Jannis Leidel
+Jason R. Coombs
 Jesse Schwartzentruber
 Joachim Brandon LeBlanc
 Johannes Christ

docs/changelog/2382.feature.rst

@@ -0,0 +1 @@
+On Windows, PROGRAMFILES, PROGRAMFILES(X86), and PROGRAMDATA environment variables are now passed through, unmasking system values necessary to locate resources such as a C compiler.

docs/config.rst

@@ -469,7 +469,8 @@ Complete list of settings that you can put into ``testenv*`` sections:
       ``REQUESTS_CA_BUNDLE``, ``SSL_CERT_FILE``,
       ``HTTP_PROXY``, ``HTTPS_PROXY``, ``NO_PROXY``
     * Windows: ``SYSTEMDRIVE``, ``SYSTEMROOT``, ``PATHEXT``, ``TEMP``, ``TMP``
-       ``NUMBER_OF_PROCESSORS``, ``USERPROFILE``, ``MSYSTEM``
+       ``NUMBER_OF_PROCESSORS``, ``USERPROFILE``, ``MSYSTEM``,
+       ``PROGRAMFILES``, ``PROGRAMFILES(X86)``, ``PROGRAMDATA``
     * Others (e.g. UNIX, macOS): ``TMPDIR``
 
     You can override these variables with the ``setenv`` option.

src/tox/config/__init__.py

@@ -807,6 +807,10 @@ def passenv(testenv_config, value):
             passenv.add("PROCESSOR_ARCHITECTURE")  # platform.machine()
             passenv.add("USERPROFILE")  # needed for `os.path.expanduser()`
             passenv.add("MSYSTEM")  # fixes #429
+            # PROGRAM* required for compiler tool discovery #2382
+            passenv.add("PROGRAMFILES")
+            passenv.add("PROGRAMFILES(X86)")
+            passenv.add("PROGRAMDATA")
         else:
             passenv.add("TMPDIR")
 

tests/unit/config/test_config.py

@@ -1518,6 +1518,9 @@ def test_passenv_as_multiline_list(self, newconfig, monkeypatch, plat):
             assert "PROCESSOR_ARCHITECTURE" in envconfig.passenv
             assert "USERPROFILE" in envconfig.passenv
             assert "MSYSTEM" in envconfig.passenv
+            assert "PROGRAMFILES" in envconfig.passenv
+            assert "PROGRAMFILES(X86)" in envconfig.passenv
+            assert "PROGRAMDATA" in envconfig.passenv
         else:
             assert "TMPDIR" in envconfig.passenv
             if sys.platform != "win32":
@@ -1562,6 +1565,9 @@ def test_passenv_as_space_separated_list(self, newconfig, monkeypatch, plat):
             assert "SYSTEMROOT" in envconfig.passenv
             assert "TEMP" in envconfig.passenv
             assert "TMP" in envconfig.passenv
+            assert "PROGRAMFILES" in envconfig.passenv
+            assert "PROGRAMFILES(X86)" in envconfig.passenv
+            assert "PROGRAMDATA" in envconfig.passenv
         else:
             assert "TMPDIR" in envconfig.passenv
         assert "PATH" in envconfig.passenv