From: trustytrojan <87675609+trustytrojan@users.noreply.github.com>
Date: Thu, 6 Aug 2026 09:07:19 +0000 (-0600)
Subject: fix: Handle case-insensitive filesystems when ignoring headers (#1764)
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;p=thirdparty%2Fccache.git

fix: Handle case-insensitive filesystems when ignoring headers (#1764)

Handle case-insensitive filesystems when ignoring headers on Windows.
---

diff --git a/src/ccache/ccache.cpp b/src/ccache/ccache.cpp
index 6382ea5ef..594931904 100644
--- a/src/ccache/ccache.cpp
+++ b/src/ccache/ccache.cpp
@@ -429,8 +429,12 @@ remember_include_file(Context& ctx,
 
   if (!ctx.ignore_header_paths.empty()) {
     // Canonicalize path for comparison; Clang uses ./header.h.
-    const std::string& canonical_path_str =
+    auto canonical_path_str =
       path_str.str().starts_with("./") ? path_str.str().substr(2) : path_str;
+#ifdef _WIN32
+    // Handle case-insensitive paths by converting to lowercase.
+    canonical_path_str = util::to_lowercase(canonical_path_str);
+#endif
     for (const auto& ignore_header_path : ctx.ignore_header_paths) {
       if (file_path_matches_dir_prefix_or_file(ignore_header_path,
                                                canonical_path_str)) {
diff --git a/src/ccache/context.cpp b/src/ccache/context.cpp
index adcf9f456..99ff4ec4e 100644
--- a/src/ccache/context.cpp
+++ b/src/ccache/context.cpp
@@ -59,6 +59,12 @@ Context::initialize(util::Args&& compiler_and_args,
   util::logging::init(config.debug(), config.log_file());
   ignore_header_paths =
     util::split_path_list(config.ignore_headers_in_manifest());
+#ifdef _WIN32
+  // Handle case-insensitive paths by converting to lowercase.
+  for (auto& path : ignore_header_paths) {
+    path = util::to_lowercase(path.string());
+  }
+#endif
   set_ignore_options(util::split_into_strings(config.ignore_options(), " "));
 
   // Set default umask for all files created by ccache from now on (if