Function ComputeCustomCommandRuleFileName

Source/cmLocalGenerator.cxx:4934–4969

}

std::string ComputeCustomCommandRuleFileName(cmLocalGenerator& lg,
                                             cmListFileBacktrace const& bt,
                                             std::string const& output)
{
  // If the output path has no generator expressions, use it directly.
  if (cmGeneratorExpression::Find(output) == std::string::npos) {
    return output;
  }

  // The output path contains a generator expression, but we must choose
  // a single source file path to which to attach the custom command.
  // Use some heuristics to provide a nice-looking name when possible.

  // If the only genex is $<CONFIG>, replace that gracefully.
  {
    std::string simple = output;
    cmSystemTools::ReplaceString(simple, "$<CONFIG>", "(CONFIG)");
    if (cmGeneratorExpression::Find(simple) == std::string::npos) {
      return simple;
    }
  }

  // If the genex evaluates to the same value in all configurations, use that.
  {
    std::vector<std::string> allConfigOutputs =
      lg.ExpandCustomCommandOutputGenex(output, bt);
    if (allConfigOutputs.size() == 1) {
      return allConfigOutputs.front();
    }
  }

  // Fall back to a deterministic unique name.
  cmCryptoHash h(cmCryptoHash::AlgoSHA256);
  return cmStrCat(lg.GetCurrentBinaryDirectory(), "/CMakeFiles/",
                  h.HashString(output).substr(0, 16));
}

cmSourceFile* AddCustomCommand(cmLocalGenerator& lg, cmCommandOrigin origin,
                               std::unique_ptr<cmCustomCommand> cc,