Method WriteMakeRule

Source/cmMakefileTargetGenerator.cxx:1343–1405

}

bool cmMakefileTargetGenerator::WriteMakeRule(
  std::ostream& os, char const* comment,
  std::vector<std::string> const& outputs,
  std::vector<std::string> const& depends,
  std::vector<std::string> const& commands, bool in_help)
{
  bool symbolic = false;
  if (outputs.empty()) {
    return symbolic;
  }

  // Check whether we need to bother checking for a symbolic output.
  bool const need_symbolic = this->GlobalGenerator->GetNeedSymbolicMark();

  // Check whether the first output is marked as symbolic.
  if (need_symbolic) {
    if (cmSourceFile* sf = this->Makefile->GetSource(outputs[0])) {
      symbolic = sf->GetPropertyAsBool("SYMBOLIC");
    }
  }

  // We always attach the actual commands to the first output.
  this->LocalGenerator->WriteMakeRule(os, comment, outputs[0], depends,
                                      commands, symbolic, in_help);

  // For single outputs, we are done.
  if (outputs.size() == 1) {
    return symbolic;
  }

  // For multiple outputs, make the extra ones depend on the first one.
  std::vector<std::string> const output_depends(1, outputs[0]);
  for (std::string const& output : cmMakeRange(outputs).advance(1)) {
    // Touch the extra output so "make" knows that it was updated,
    // but only if the output was actually created.
    std::string const out = this->LocalGenerator->ConvertToOutputFormat(
      this->LocalGenerator->MaybeRelativeToTopBinDir(output),
      cmOutputConverter::SHELL);
    std::vector<std::string> output_commands;

    bool o_symbolic = false;
    if (need_symbolic) {
      if (cmSourceFile const* sf = this->Makefile->GetSource(output)) {
        o_symbolic = sf->GetPropertyAsBool("SYMBOLIC");
      }
    }
    symbolic = symbolic && o_symbolic;

    if (!o_symbolic) {
      output_commands.push_back("@$(CMAKE_COMMAND) -E touch_nocreate " + out);
    }
    this->LocalGenerator->WriteMakeRule(os, nullptr, output, output_depends,
                                        output_commands, o_symbolic, in_help);

    if (!o_symbolic) {
      // At build time, remove the first output if this one does not exist
      // so that "make" will rerun the real commands that create this one.
      MultipleOutputPairsType::value_type p(output, outputs[0]);