Forward vcvarsall env vars through lit.cfg.py. (#11089)
Progress on https://github.com/iree-org/iree/issues/11009
This fixes these two tests on Windows:
*
`iree/compiler/Dialect/HAL/Target/LLVM/test/smoketest_system.mlir.test`
* `iree/tests/e2e/regression/libm_linking.mlir.test`
Developers should run vcvarsall before ctest, or configure their IDE as
needed. For VSCode, I have this set:
```json
"cmakeExplorer.extraCtestEnvVars": {
"VCTOOLSINSTALLDIR": "C:\\Program Files (x86)\\Microsoft Visual Studio\\2022\\Preview\\VC\\Tools\\MSVC\\14.31.31103\\",
"UNIVERSALCRTSDKDIR": "C:\\Program Files (x86)\\Windows Kits\\10\\",
"UCRTVersion": "10.0.19041.0",
},
```diff --git a/tests/lit.cfg.py b/tests/lit.cfg.py
index 77a0498..5ed367a 100644
--- a/tests/lit.cfg.py
+++ b/tests/lit.cfg.py
@@ -18,8 +18,18 @@
config.name = "IREE"
config.suffixes = [".mlir", ".txt"]
config.test_format = lit.formats.ShTest(execute_external=True)
-# Forward all IREE environment variables
-passthrough_env_vars = ["VK_ICD_FILENAMES"]
+
+# Forward all IREE environment variables, as well as some passthroughs.
+# Note: env vars are case-insensitive on Windows, so check matches carefully.
+# https://stackoverflow.com/q/7797269
+passthrough_env_vars = [
+ # The Vulkan loader uses this
+ "VK_ICD_FILENAMES",
+ # WindowsLinkerTool uses these from vcvarsall
+ "VCTOOLSINSTALLDIR",
+ "UNIVERSALCRTSDKDIR",
+ "UCRTVERSION"
+]
config.environment.update({
k: v
for k, v in os.environ.items()
