+void Toolchain::add_toolchain(Toolchain *chain)
+{
+ chains.push_back(chain);
+}
+
+bool Toolchain::has_tool(const string &tag) const
+{
+ if(tools.count(tag))
+ return true;
+ return any_of(chains.begin(), chains.end(), [&tag](Toolchain *tc){ return tc->has_tool(tag); });
+}
+