How do I get the output of Erlang's preprocessor?

Question

I've got a weird macro that I'm debugging and I can't seem to figure out how to get the output of the preprocessor. I'm looking for the equivalent of GCC's -save-temps. I've tried passing dpp to compile:file/2, but it seems to generate a parse tree, not preprocessed Erlang.

compile:file("t.erl", 'E'). as mentioned by Anton is great, but doesn't help with macros that cause syntax errors. Lacking a way to debug complicated macros, I'm leaning toward doing my metaprogramming by writing programs that generate code.

Answer 1

Try one of these:

   compile:file("t.erl", 'P').
   compile:file("t.erl", 'E').