diff options
Diffstat (limited to 'Source')
| -rw-r--r-- | Source/cmcmd.cxx | 33 |
1 files changed, 25 insertions, 8 deletions
diff --git a/Source/cmcmd.cxx b/Source/cmcmd.cxx index a79a2ff..e6dd99a 100644 --- a/Source/cmcmd.cxx +++ b/Source/cmcmd.cxx @@ -562,19 +562,36 @@ int cmcmd::ExecuteCMakeCommand(std::vector<std::string> const& args) "objlistfile [-nm=nm-path]\n"; return 1; } - FILE* fout = cmsys::SystemTools::Fopen(args[2].c_str(), "w+"); - if (!fout) { - std::cerr << "could not open output .def file: " << args[2].c_str() - << "\n"; - return 1; - } cmsys::ifstream fin(args[3].c_str(), std::ios::in | std::ios::binary); if (!fin) { std::cerr << "could not open object list file: " << args[3].c_str() << "\n"; return 1; } - std::string file; + std::vector<std::string> files; + { + std::string file; + cmFileTime outTime; + bool outValid = outTime.Load(args[2]); + while (cmSystemTools::GetLineFromStream(fin, file)) { + files.push_back(file); + if (outValid) { + cmFileTime inTime; + outValid = inTime.Load(file) && inTime.Older(outTime); + } + } + if (outValid) { + // The def file already exists and all input files are older than the + // existing def file. + return 0; + } + } + FILE* fout = cmsys::SystemTools::Fopen(args[2].c_str(), "w+"); + if (!fout) { + std::cerr << "could not open output .def file: " << args[2].c_str() + << "\n"; + return 1; + } bindexplib deffile; if (args.size() >= 5) { auto a = args[4]; @@ -585,7 +602,7 @@ int cmcmd::ExecuteCMakeCommand(std::vector<std::string> const& args) std::cerr << "unknown argument: " << a << "\n"; } } - while (cmSystemTools::GetLineFromStream(fin, file)) { + for (auto const& file : files) { std::string const& ext = cmSystemTools::GetFilenameLastExtension(file); if (cmSystemTools::LowerCase(ext) == ".def") { if (!deffile.AddDefinitionFile(file.c_str())) { |