+string GnuCompiler::create_build_signature(const BuildInfo &binfo) const
+{
+ string result = FS::basename(executable->get_path());
+ if(!architecture->get_cpu().empty())
+ {
+ result += ",m";
+ result += architecture->get_cpu();
+ }
+ 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()
+{
+ executable = builder.get_vfs().find_binary(command);
+ if(executable)
+ {
+ ExternalTask::Arguments argv;
+ argv.push_back(executable->get_path().str());
+ argv.push_back("-Wp,-v");
+ argv.push_back("-E");
+ if(tag=="CXX")
+ argv.push_back("-xc++");
+ const FS::Path &sysroot = build_info.sysroot;
+ if(!sysroot.empty())
+ argv.push_back("--sysroot="+sysroot.str());
+ argv.push_back("-");
+
+ string prog = FS::basename(executable->get_path());
+ builder.get_logger().log("auxcommands", format("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;
+ 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", format("Got %s (%s) system path: %s", prog, tag, path));
+ system_path.push_back(path);
+ }
+ start = newline+1;
+ }
+ }
+ catch(const runtime_error &e)
+ {
+ problems.push_back("Unable to determine system path");
+ }
+ }
+}
+