Method CheckBuildSystem

Source/cmake.cxx:3489–3634

}

int cmake::CheckBuildSystem()
{
  // We do not need to rerun CMake.  Check dependency integrity.
  bool const verbose = isCMakeVerbose();

  // This method will check the integrity of the build system if the
  // option was given on the command line.  It reads the given file to
  // determine whether CMake should rerun.

  // If no file is provided for the check, we have to rerun.
  if (this->CheckBuildSystemArgument.empty()) {
    if (verbose) {
      cmSystemTools::Stdout("Re-run cmake no build system arguments\n");
    }
    return 1;
  }

  // If the file provided does not exist, we have to rerun.
  if (!cmSystemTools::FileExists(this->CheckBuildSystemArgument)) {
    if (verbose) {
      std::ostringstream msg;
      msg << "Re-run cmake missing file: " << this->CheckBuildSystemArgument
          << '\n';
      cmSystemTools::Stdout(msg.str());
    }
    return 1;
  }

  // Read the rerun check file and use it to decide whether to do the
  // global generate.
  // Actually, all we need is the `set` command.
  cmake cm(cmState::Role::Script);
  cm.GetCurrentSnapshot().SetDefaultDefinitions();
  cmGlobalGenerator gg(&cm);
  cmMakefile mf(&gg, cm.GetCurrentSnapshot());
  if (!mf.ReadListFile(this->CheckBuildSystemArgument) ||
      cmSystemTools::GetErrorOccurredFlag()) {
    if (verbose) {
      std::ostringstream msg;
      msg << "Re-run cmake error reading : " << this->CheckBuildSystemArgument
          << '\n';
      cmSystemTools::Stdout(msg.str());
    }
    // There was an error reading the file.  Just rerun.
    return 1;
  }

  if (this->ClearBuildSystem) {
    // Get the generator used for this build system.
    std::string genName = mf.GetSafeDefinition("CMAKE_DEPENDS_GENERATOR");
    if (!cmNonempty(genName)) {
      genName = "Unix Makefiles";
    }

    // Create the generator and use it to clear the dependencies.
    std::unique_ptr<cmGlobalGenerator> ggd =
      this->CreateGlobalGenerator(genName);
    if (ggd) {