plugin: ignore -I command line arguments

experiments/lib.py

@@ -32,7 +32,7 @@ class ClangHashHelper:
             os.mkdir(cache_dir)
             os.environ["CCACHE_DIR"] = cache_dir
         if "clang-hash" in self.mode.value:
-            cache_dir = os.path.join(self.tmp_directory.path, "clang-hash")
+            cache_dir = os.path.join(self.tmp_directory.path, "clang-hash-cache")
             os.mkdir(cache_dir)
             os.environ["CLANG_HASH_CACHE"] = cache_dir
 

src/clang-hash.cc

@@ -280,6 +280,14 @@ private:
         if (Arg.find("-stop-if-same-hash") != std::string::npos) {
             continue; // also don't hash this (plugin argument)
         }
+        if (Arg == "-I") {
+            // throw away next parameter (include path)
+            getline(CommandLine, Arg, '\0');
+            continue;
+        }
+        if (Arg.substr(0,2) == "-I") {
+            continue; // also don't hash include paths
+        }
         if (Arg.find("-hash-verbose") != std::string::npos) {
             continue; // also don't hash this (plugin argument)
         }