argv.push_back("-o");
argv.push_back(relative(opath, work_dir).str());
argv.push_back(relative(spath, work_dir).str());
if(!builder.get_dry_run())
argv.push_back("-o");
argv.push_back(relative(opath, work_dir).str());
argv.push_back(relative(spath, work_dir).str());
if(!builder.get_dry_run())