[clang-tools-extra] [clang-tidy] Add an option to treat warnings as errors (PR #128221)

[via cfe-commits]

https://github.com/juru1234 created https://github.com/llvm/llvm-project/pull/128221

This patch allows to treat warnings as erros using clang-tidy-diff.

>From 1c205282d5e9390d2498a2a308a9ac3d0deb8b6b Mon Sep 17 00:00:00 2001
From: Julian Ruess <julianonline+github at posteo.de>
Date: Fri, 21 Feb 2025 20:42:46 +0100
Subject: [PATCH] [clang-tidy] Add an option to treat warnings as errors

This patch allows to treat warnings as erros using clang-tidy-diff.
---
 clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py b/clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py
index 33de2077dfb1a..863b504539b58 100755
--- a/clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py
+++ b/clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py
@@ -259,6 +259,12 @@ def main():
         action="store_true",
         help="Only check files in the compilation database",
     )
+    parser.add_argument(
+        "-warnings-as-errors",
+        help="Upgrades clang-tidy warnings to errors. Same format as '-checks'.",
+        default="",
+    )
+
 
     clang_tidy_args = []
     argv = sys.argv[1:]
@@ -374,6 +380,9 @@ def main():
         common_clang_tidy_args.append("-extra-arg-before=%s" % arg)
     for plugin in args.plugins:
         common_clang_tidy_args.append("-load=%s" % plugin)
+    if args.warnings_as_errors != "":
+        common_clang_tidy_args.append("-warnings-as-errors=" + args.warnings_as_errors)
+
 
     for name in lines_by_file:
         line_filter_json = json.dumps(