Method CreateCDCommand

Source/cmLocalUnixMakefileGenerator3.cxx:2282–2319

}

void cmLocalUnixMakefileGenerator3::CreateCDCommand(
  std::vector<std::string>& commands, std::string const& tgtDir,
  std::string const& relDir)
{
  // do we need to cd?
  if (tgtDir == relDir) {
    return;
  }

  // In a Windows shell we must change drive letter too.  The shell
  // used by NMake and Borland make does not support "cd /d" so this
  // feature simply cannot work with them (Borland make does not even
  // support changing the drive letter with just "d:").
  char const* cd_cmd = this->IsMinGWMake() ? "cd /d " : "cd ";

  cmGlobalUnixMakefileGenerator3* gg =
    static_cast<cmGlobalUnixMakefileGenerator3*>(this->GlobalGenerator);
  if (!gg->UnixCD) {
    // On Windows we must perform each step separately and then change
    // back because the shell keeps the working directory between
    // commands.
    std::string cmd =
      cmStrCat(cd_cmd, this->ConvertToOutputForExisting(tgtDir));
    commands.insert(commands.begin(), cmd);

    // Change back to the starting directory.
    cmd = cmStrCat(cd_cmd, this->ConvertToOutputForExisting(relDir));
    commands.push_back(std::move(cmd));
  } else {
    // On UNIX we must construct a single shell command to change
    // directory and build because make resets the directory between
    // each command.
    std::string outputForExisting = this->ConvertToOutputForExisting(tgtDir);
    std::string prefix = cd_cmd + outputForExisting + " && ";
    std::transform(commands.begin(), commands.end(), commands.begin(),
                   [&prefix](std::string const& s) { return prefix + s; });
  }
}