Function AdjustRPathELF

Source/cmSystemTools.cxx:3386–3531

  cm::optional<std::string>&, std::string const&, char const*, std::string*)>;

cm::optional<bool> AdjustRPathELF(std::string const& file,
                                  EmptyCallback const& emptyCallback,
                                  AdjustCallback const& adjustCallback,
                                  std::string* emsg, bool* changed)
{
  if (changed) {
    *changed = false;
  }
  int rp_count = 0;
  bool remove_rpath = true;
  cmSystemToolsRPathInfo rp[2];
  {
    // Parse the ELF binary.
    cmELF elf(file.c_str());
    if (!elf) {
      return cm::nullopt; // Not a valid ELF file.
    }

    if (!elf.HasDynamicSection()) {
      return true; // No dynamic section to update.
    }

    // Get the RPATH and RUNPATH entries from it.
    int se_count = 0;
    cmELF::StringEntry const* se[2] = { nullptr, nullptr };
    char const* se_name[2] = { nullptr, nullptr };
    if (cmELF::StringEntry const* se_rpath = elf.GetRPath()) {
      se[se_count] = se_rpath;
      se_name[se_count] = "RPATH";
      ++se_count;
    }
    if (cmELF::StringEntry const* se_runpath = elf.GetRunPath()) {
      se[se_count] = se_runpath;
      se_name[se_count] = "RUNPATH";
      ++se_count;
    }
    if (se_count == 0) {
      return emptyCallback(emsg, elf);
    }

    for (int i = 0; i < se_count; ++i) {
      // If both RPATH and RUNPATH refer to the same string literal it
      // needs to be changed only once.
      if (rp_count && rp[0].Position == se[i]->Position) {
        continue;
      }

      // Store information about the entry in the file.
      rp[rp_count].Position = se[i]->Position;
      rp[rp_count].Size = se[i]->Size;
      rp[rp_count].Name = se_name[i];

      // Adjust the rpath.
      cm::optional<std::string> outRPath;
      if (!adjustCallback(outRPath, se[i]->Value, se_name[i], emsg)) {
        return false;
      }