Method IsIPOEnabled

Source/cmGeneratorTarget.cxx:787–862

}

bool cmGeneratorTarget::IsIPOEnabled(std::string const& lang,
                                     std::string const& config) const
{
  cmValue feature = this->GetFeature("INTERPROCEDURAL_OPTIMIZATION", config);

  if (!feature.IsOn()) {
    // 'INTERPROCEDURAL_OPTIMIZATION' is off, no need to check policies
    return false;
  }

  if (lang != "C" && lang != "CXX" && lang != "CUDA" && lang != "Fortran") {
    // We do not define IPO behavior for other languages.
    return false;
  }

  if (lang == "CUDA") {
    // CUDA IPO requires both CUDA_ARCHITECTURES and CUDA_SEPARABLE_COMPILATION
    if (cmIsOff(this->GetSafeProperty("CUDA_ARCHITECTURES")) ||
        cmIsOff(this->GetSafeProperty("CUDA_SEPARABLE_COMPILATION"))) {
      return false;
    }
  }

  cmPolicies::PolicyStatus cmp0069 = this->GetPolicyStatusCMP0069();

  if (cmp0069 == cmPolicies::OLD || cmp0069 == cmPolicies::WARN) {
    if (this->Makefile->IsOn(
          cmStrCat("_CMAKE_", lang, "_IPO_LEGACY_BEHAVIOR"))) {
      return true;
    }
    if (this->PolicyReportedCMP0069) {
      // problem is already reported, no need to issue a message
      return false;
    }
    bool const in_try_compile =
      this->LocalGenerator->GetCMakeInstance()->GetIsInTryCompile();
    if (cmp0069 == cmPolicies::WARN && !in_try_compile) {
      std::ostringstream w;
      w << cmPolicies::GetPolicyWarning(cmPolicies::CMP0069) << "\n";
      w << "INTERPROCEDURAL_OPTIMIZATION property will be ignored for target "
        << "'" << this->GetName() << "'.";
      this->LocalGenerator->GetCMakeInstance()->IssueMessage(
        MessageType::AUTHOR_WARNING, w.str(), this->GetBacktrace());

      this->PolicyReportedCMP0069 = true;
    }
    return false;
  }

  // Note: check consistency with messages from CheckIPOSupported
  char const* message = nullptr;
  if (!this->Makefile->IsOn("_CMAKE_" + lang + "_IPO_SUPPORTED_BY_CMAKE")) {
    message = "CMake doesn't support IPO for current compiler";
  } else if (!this->Makefile->IsOn("_CMAKE_" + lang +
                                   "_IPO_MAY_BE_SUPPORTED_BY_COMPILER")) {
    message = "Compiler doesn't support IPO";
  } else if (!this->GlobalGenerator->IsIPOSupported()) {
    message = "CMake doesn't support IPO for current generator";