Method ExtractFlagRegex

Source/cmGlobalXCodeGenerator.cxx:2311–2337

This function removes each matching occurrence of the expression and returns the last one (i.e., the dominant flag in GCC)

// This function removes each matching occurrence of the expression and
// returns the last one (i.e., the dominant flag in GCC)
std::string cmGlobalXCodeGenerator::ExtractFlagRegex(char const* exp,
                                                     int matchIndex,
                                                     std::string& flags)
{
  std::string retFlag;

  cmsys::RegularExpression regex(exp);
  assert(regex.is_valid());
  if (!regex.is_valid()) {
    return retFlag;
  }

  std::string::size_type offset = 0;

  while (regex.find(&flags[offset])) {
    std::string::size_type const startPos = offset + regex.start(matchIndex);
    std::string::size_type const endPos = offset + regex.end(matchIndex);
    std::string::size_type const size = endPos - startPos;

    offset = startPos + 1;

    retFlag.assign(flags, startPos, size);
    flags.replace(startPos, size, size, ' ');
  }

  return retFlag;
}

//----------------------------------------------------------------------------
// This function strips off Xcode attributes that do not target the current