Method TryCompile

Source/cmMakefile.cxx:3212–3347

}

int cmMakefile::TryCompile(std::string const& srcdir,
                           std::string const& bindir,
                           std::string const& projectName,
                           std::string const& targetName, bool fast, int jobs,
                           std::vector<std::string> const* cmakeArgs,
                           std::string& output)
{
  this->IsSourceFileTryCompile = fast;
  // does the binary directory exist ? If not create it...
  if (!cmSystemTools::FileIsDirectory(bindir)) {
    cmSystemTools::MakeDirectory(bindir);
  }

  // change to the tests directory and run cmake
  // use the cmake object instead of calling cmake
  cmWorkingDirectory workdir(bindir);
  if (workdir.Failed()) {
    this->IssueMessage(MessageType::FATAL_ERROR, workdir.GetError());
    cmSystemTools::SetFatalErrorOccurred();
    this->IsSourceFileTryCompile = false;
    return 1;
  }

  // unset the NINJA_STATUS environment variable while running try compile.
  // since we parse the output, we need to ensure there aren't any unexpected
  // characters that will cause issues, such as ANSI color escape codes.
  cm::optional<cmSystemTools::ScopedEnv> maybeNinjaStatus;
  if (this->GetGlobalGenerator()->IsNinja()) {
    maybeNinjaStatus.emplace("NINJA_STATUS=");
  }

  // make sure the same generator is used
  // use this program as the cmake to be run, it should not
  // be run that way but the cmake object requires a valid path
  cmake cm(cmState::Role::Project, cmState::TryCompile::Yes);
  auto gg = cm.CreateGlobalGenerator(this->GetGlobalGenerator()->GetName());
  if (!gg) {
    this->IssueMessage(MessageType::INTERNAL_ERROR,
                       "Global generator '" +
                         this->GetGlobalGenerator()->GetName() +
                         "' could not be created.");
    cmSystemTools::SetFatalErrorOccurred();
    this->IsSourceFileTryCompile = false;
    return 1;
  }
  gg->RecursionDepth = this->RecursionDepth;
  cm.SetGlobalGenerator(std::move(gg));

  // copy trace state
  cm.SetTraceRedirect(this->GetCMakeInstance());

  // do a configure
  cm.SetHomeDirectory(srcdir);
  cm.SetHomeOutputDirectory(bindir);
  cm.SetGeneratorInstance(this->GetSafeDefinition("CMAKE_GENERATOR_INSTANCE"));
  cm.SetGeneratorPlatform(this->GetSafeDefinition("CMAKE_GENERATOR_PLATFORM"));
  cm.SetGeneratorToolset(this->GetSafeDefinition("CMAKE_GENERATOR_TOOLSET"));
  cm.LoadCache();