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[clang-tidy][test] Make check_clang_tidy.py work with very long file paths #155318

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Merged
merged 2 commits into from
Aug 26, 2025
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[clang-tidy][test] Make check_clang_tidy.py work with very long file paths #155318

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[clang-tidy][test] Make check_clang_tidy.py work with very long file …
aeubanks Aug 25, 2025
bd0eecc
Handle long file paths on Windows
rnk Aug 25, 2025
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8 changes: 7 additions & 1 deletion clang-tools-extra/test/clang-tidy/check_clang_tidy.py
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,7 @@
import argparse
import os
import pathlib
import platform
import re
import subprocess
import sys
Expand Down Expand Up @@ -145,7 +146,12 @@ def __init__(self, args: argparse.Namespace, extra_args: List[str]) -> None:
self.clang_extra_args.append("-resource-dir=%s" % self.resource_dir)

def read_input(self) -> None:
with open(self.input_file_name, "r", encoding="utf-8") as input_file:
# Use a "\\?\" prefix on Windows to handle long file paths transparently:
# https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation
file_name = self.input_file_name
if platform.system() == "Windows":
file_name = "\\\\?\\" + os.path.abspath(file_name)
with open(file_name, "r", encoding="utf-8") as input_file:
self.input_text = input_file.read()

def get_prefixes(self) -> None:
Expand Down