Added another attempt to find libclang resource path

src/compile_commands.cpp

@@ -85,6 +85,22 @@ std::vector<std::string> CompileCommands::get_arguments(const boost::filesystem:
   }
 
   static auto resource_path = []() -> std::string {
+    // Try based on clang_getClangVersion first, even though its format is not guaranteed to be stable.
+    auto clang_version = clangmm::to_string(clang_getClangVersion());
+    std::string version;
+    for(auto it = clang_version.rbegin(); it != clang_version.rend() && ((*it >= '0' && *it <= '9') || *it == '.'); ++it)
+      version.insert(version.begin(), *it);
+    while(!version.empty() && version.front() != '.' && version.back() != '.') {
+      auto path = boost::filesystem::path(LIBCLANG_LIBRARY_DIR) / "clang" / version;
+      boost::system::error_code ec;
+      if(boost::filesystem::is_directory(path / "include", ec))
+        return path.string();
+      auto pos = version.rfind('.');
+      if(pos == std::string::npos)
+        break;
+      version.erase(pos);
+    }
+
     boost::system::error_code ec;
     for(boost::filesystem::directory_iterator it(boost::filesystem::path(LIBCLANG_LIBRARY_DIR) / "clang", ec), end; it != end; ++it) {
       if(boost::filesystem::is_directory(it->path() / "include", ec))