[clang] Generate empty .clang-format-ignore before running tests (PR #136154)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-format

Author: Devon Loehr (DKLoehr)

<details>
<summary>Changes</summary>

Followup to #<!-- -->136022, this ensures formatting tests are run with an empty `.clang-format-ignore` in their root directory, to prevent failures if the file also exists higher in the tree.

---
Full diff: https://github.com/llvm/llvm-project/pull/136154.diff


1 Files Affected:

- (modified) clang/test/Format/lit.local.cfg (+6) 


``````````diff
diff --git a/clang/test/Format/lit.local.cfg b/clang/test/Format/lit.local.cfg
index b060c79226cbd..cf79e8df89a33 100644
--- a/clang/test/Format/lit.local.cfg
+++ b/clang/test/Format/lit.local.cfg
@@ -1,3 +1,4 @@
+import os
 import platform
 import lit.formats
 
@@ -27,3 +28,8 @@ config.suffixes = [
 # python implementation does, so use that for cross platform compatibility
 if platform.system() == "AIX":
     config.test_format = lit.formats.ShTest()
+
+# Create an empty .clang-format-ignore file so that tests don't get messed
+# up if one exists higher in the tree
+with open(os.path.join("Format", ".clang-format-ignore"), 'w'):
+    pass
\ No newline at end of file

``````````

</details>


https://github.com/llvm/llvm-project/pull/136154