Method GetPchHeader

Source/cmGeneratorTarget.cxx:3012–3115

}

std::string cmGeneratorTarget::GetPchHeader(std::string const& config,
                                            std::string const& language,
                                            std::string const& arch) const
{
  if (language != "C" && language != "CXX" && language != "OBJC" &&
      language != "OBJCXX") {
    return std::string();
  }

  if (this->GetPropertyAsBool("DISABLE_PRECOMPILE_HEADERS")) {
    return std::string();
  }
  cmGeneratorTarget const* generatorTarget = this;
  cmGeneratorTarget const* reuseTarget = this->GetPchReuseTarget();
  bool const haveReuseTarget = reuseTarget && reuseTarget != this;
  if (reuseTarget) {
    generatorTarget = reuseTarget;
  }

  auto const inserted =
    this->PchHeaders.insert(std::make_pair(language + config + arch, ""));
  if (inserted.second) {
    std::vector<BT<std::string>> const headers =
      this->GetPrecompileHeaders(config, language);
    if (headers.empty() && !haveReuseTarget) {
      return std::string();
    }
    std::string& filename = inserted.first->second;

    std::map<std::string, std::string> const languageToExtension = {
      { "C", ".h" },
      { "CXX", ".hxx" },
      { "OBJC", ".objc.h" },
      { "OBJCXX", ".objcxx.hxx" }
    };

    filename = generatorTarget->GetCMFSupportDirectory();

    if (this->GetGlobalGenerator()->IsMultiConfig()) {
      filename = cmStrCat(filename, '/', config);
    }

    // This is acceptable as its the source file, won't have a rename/hash
    filename =
      cmStrCat(filename, "/cmake_pch", arch.empty() ? "" : cmStrCat('_', arch),
               languageToExtension.at(language));

    std::string const filename_tmp = cmStrCat(filename, ".tmp");
    if (!haveReuseTarget) {
      cmValue pchPrologue =
        this->Makefile->GetDefinition("CMAKE_PCH_PROLOGUE");
      cmValue pchEpilogue =
        this->Makefile->GetDefinition("CMAKE_PCH_EPILOGUE");

      std::string firstHeaderOnDisk;
      {
        cmGeneratedFileStream file(
          filename_tmp, false,