+string GnuCompiler::create_build_signature(const BuildInfo &binfo) const
+{
+ if(!executable)
+ return string();
+
+ string result = Tool::create_build_signature(binfo);
+ if(!architecture->get_cpu().empty())
+ {
+ result += ",m";
+ result += architecture->get_cpu();
+ }
+ if(binfo.debug || binfo.optimize)
+ result += ',';
+ if(binfo.debug)
+ result += 'g';
+ if(binfo.optimize)
+ {
+ result += 'O';
+ result += (binfo.optimize>0 ? '0'+binfo.optimize : 's');
+ }
+ return result;
+}
+
+void GnuCompiler::do_prepare(ToolData &tool) const
+{
+ tool.extra_data = 0U;
+ prepare_syspath(tool);
+ prepare_version(tool);
+}
+
+void GnuCompiler::prepare_syspath(ToolData &tool) const
+{
+ bool path_found = false;
+ const FS::Path &sysroot = tool.build_info.sysroot;
+ const std::string &tool_tag = static_cast<Tool &>(tool).get_tag();
+
+ const FileTarget *exe = static_cast<Tool &>(tool).get_executable();
+ if(exe)
+ {
+ ExternalTask::Arguments argv;
+ argv.push_back(exe->get_path().str());
+ argv.push_back("-Wp,-v");
+ argv.push_back("-E");
+ if(tag=="CXX")
+ argv.push_back("-xc++");
+ if(!sysroot.empty())
+ argv.push_back("--sysroot="+sysroot.str());
+ argv.push_back("-");
+
+ builder.get_logger().log("auxcommands", "Running %s", join(argv.begin(), argv.end()));
+ try
+ {
+ string output = ExternalTask::run_and_capture_output(argv, FS::Path(), true);
+ string::size_type start = 0;
+ bool record_path = false;
+ while(start<output.size())
+ {
+ string::size_type newline = output.find('\n', start);
+ if(!output.compare(start, 34, "#include <...> search starts here:"))
+ {
+ record_path = true;
+ path_found = true;
+ }
+ else if(!output.compare(start, 19, "End of search list."))
+ record_path = false;
+ else if(record_path)
+ {
+ FS::Path path = strip(output.substr(start, newline-start));
+ builder.get_logger().log("tools", "Got %s system path: %s", tool_tag, path);
+ tool.system_path.push_back(path);
+ }
+ start = newline+1;
+ }
+ }
+ catch(const runtime_error &)
+ { }
+ }
+
+ if(!path_found)
+ {
+ builder.get_logger().log("tools", "No %s system path found, using defaults", tool_tag);
+ const Architecture &arch = *static_cast<Tool &>(tool).get_architecture();
+ if(!sysroot.empty())
+ tool.system_path.push_back(sysroot/"usr/include");
+ else if(arch.is_native())
+ tool.system_path.push_back("/usr/include");
+ else
+ tool.system_path.push_back(format("/usr/%s/include", arch.get_cross_prefix()));
+ }
+}
+
+void GnuCompiler::prepare_version(ToolData &tool) const