Added *hidden* flags -print-options and -print-all-options so

developers can see if their driver changed any cl::Option's. The
current implementation isn't perfect but handles most kinds of
options. This is nice to have when decomposing the stages of
compilation and moving between different drivers. It's also a good
sanity check when comparing results produced by different command line
invocations that are expected to produce the comparable results.

Note: This is not an attempt to prolong the life of cl::Option. On the
contrary, it's a placeholder for a feature that must exist when
cl::Option is replaced by a more appropriate framework. A new
framework needs: a central option registry, dynamic name lookup,
non-global containers of option values (e.g. per-module,
per-function), *and* the ability to print options values and their defaults at
any point during compilation.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128910 91177308-0d34-0410-b5e6-96231b3b80d8

tools/opt/opt.cpp

@@ -701,6 +701,9 @@ int main(int argc, char **argv) {
       Passes.add(createBitcodeWriterPass(Out->os()));
   }
 
+  // Before executing passes, print the final values of the LLVM options.
+  cl::PrintOptionValues();
+
   // Now that we have all of the passes ready, run them.
   Passes.run(*M.get());