lib 1400533 // ECJ

sS invokeEcj_direct(File optionsFile) ctex {
  new StringWriter writer;
  PrintWriter printWriter = new(writer);
  
  S[] args = { "@" + optionsFile.getPath() };
      
  org.eclipse.jdt.internal.compiler.batch.Main
    ecj = new org.eclipse.jdt.internal.compiler.batch.Main
      (printWriter, printWriter, false);
  ecj.compile(args);
  int errors = ecj.globalErrorsCount;

  S output = str(writer);
  if (errors != 0) {
    print(output);
    throw new JavaCompileException("ECJ returned errors. " + output + "\nOptions: " + loadTextFile(optionsFile));
  }
  ret output;
}

Began life as a copy of #1008598