[clang-tools-extra] [clang-tidy] Do not pass any file when listing checks in run_clang_ti… (PR #137286)

[Carlos Galvez via cfe-commits]

https://github.com/carlosgalvezp created https://github.com/llvm/llvm-project/pull/137286

…dy.py

Currently, run_clang_tidy.py does not correctly display the list of checks picked up from the top-level .clang-tidy file. The reason for that is that we are passing an empty string as input file.

However, that's not how we are supposed to use clang-tidy to list checks. Per https://github.com/llvm/llvm-project/commit/65eccb463df7fe511c813ee6a1794c80d7489ff2, we simply should not pass any file at all - the internal code of clang-tidy will pass a "dummy" file if that's the case and get the .clang-tidy file from the current working directory.

Fixes #136659

>From b91a22a6c48949725c39d28468b274df4b54d2e9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Carlos=20G=C3=A1lvez?= <carlos.galvez at zenseact.com>
Date: Fri, 25 Apr 2025 06:17:46 +0000
Subject: [PATCH] [clang-tidy] Do not pass any file when listing checks in
 run_clang_tidy.py

Currently, run_clang_tidy.py does not correctly display the list of
checks picked up from the top-level .clang-tidy file. The reason for
that is that we are passing an empty string as input file.

However, that's not how we are supposed to use clang-tidy to list
checks. Per https://github.com/llvm/llvm-project/commit/65eccb463df7fe511c813ee6a1794c80d7489ff2,
we simply should not pass any file at all - the internal code of
clang-tidy will pass a "dummy" file if that's the case and get the
.clang-tidy file from the current working directory.

Fixes #136659
---
 clang-tools-extra/clang-tidy/tool/run-clang-tidy.py | 7 ++++---
 clang-tools-extra/docs/ReleaseNotes.rst             | 3 +++
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/clang-tools-extra/clang-tidy/tool/run-clang-tidy.py b/clang-tools-extra/clang-tidy/tool/run-clang-tidy.py
index f1b934f7139e9..8741147a4f8a3 100755
--- a/clang-tools-extra/clang-tidy/tool/run-clang-tidy.py
+++ b/clang-tools-extra/clang-tidy/tool/run-clang-tidy.py
@@ -87,7 +87,7 @@ def find_compilation_database(path: str) -> str:
 
 
 def get_tidy_invocation(
-    f: str,
+    f: Optional[str],
     clang_tidy_binary: str,
     checks: str,
     tmpdir: Optional[str],
@@ -147,7 +147,8 @@ def get_tidy_invocation(
         start.append(f"--warnings-as-errors={warnings_as_errors}")
     if allow_no_checks:
         start.append("--allow-no-checks")
-    start.append(f)
+    if f:
+        start.append(f)
     return start
 
 
@@ -490,7 +491,7 @@ async def main() -> None:
 
     try:
         invocation = get_tidy_invocation(
-            "",
+            None,
             clang_tidy_binary,
             args.checks,
             None,
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst b/clang-tools-extra/docs/ReleaseNotes.rst
index 761c1d3a80359..01db52c96f80a 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -103,6 +103,9 @@ Improvements to clang-tidy
 - Fixed bug in :program:`clang-tidy` by which `HeaderFilterRegex` did not take
   effect when passed via the `.clang-tidy` file.
 
+- Fixed bug in :program:`run_clang_tidy.py` where the program would not
+  correctly display the checks enabled by the top-level `.clang-tidy` file.
+
 New checks
 ^^^^^^^^^^