[Clang] Enable lit internal shell by default

[boomanaiden154]

Now that all of the clang tests have been verified (and adjusted when
necessary) to work with lit's internal shell, we can enable it by
default, which this patch does.

This should make check-clang 10-15% faster in addition to providing
richer feedback on test failures.

[llvmbot]

@llvm/pr-subscribers-clang

Author: Aiden Grossman (boomanaiden154)

Changes

Now that all of the clang tests have been verified (and adjusted when
necessary) to work with lit's internal shell, we can enable it by
default, which this patch does.

This should make check-clang 10-15% faster in addition to providing
richer feedback on test failures.

---

Full diff: https://github.com/llvm/llvm-project/pull/158465.diff

1 Files Affected:

• (modified) clang/test/lit.cfg.py (+12-1)

diff --git a/clang/test/lit.cfg.py b/clang/test/lit.cfg.py
index d34319131ab6d..09c9311c4d362 100644
--- a/clang/test/lit.cfg.py
+++ b/clang/test/lit.cfg.py
@@ -18,11 +18,22 @@
 # name: The name of this test suite.
 config.name = "Clang"
 
+# TODO: Consolidate the logic for turning on the internal shell by default for all LLVM test suites.
+# See https://github.com/llvm/llvm-project/issues/106636 for more details.
+#
+# We prefer the lit internal shell which provides a better user experience on failures
+# and is faster unless the user explicitly disables it with LIT_USE_INTERNAL_SHELL=0
+# env var.
+use_lit_shell = True
+lit_shell_env = os.environ.get("LIT_USE_INTERNAL_SHELL")
+if lit_shell_env:
+    use_lit_shell = lit.util.pythonize_bool(lit_shell_env)
+
 # testFormat: The test format to use to interpret tests.
 #
 # For now we require '&&' between commands, until they get globally killed and
 # the test runner updated.
-config.test_format = lit.formats.ShTest(not llvm_config.use_lit_shell)
+config.test_format = lit.formats.ShTest(execute_external=not use_lit_shell)
 
 # suffixes: A list of file extensions to treat as test files.
 config.suffixes = [