Add an undocumented option [--solver [v1 | v2]]

The original implementation of the type signature solver is called 'v1'
and the newly introduced alternative implementation is called 'v2'.

It is possible to run just the one of the solvers (in case there is a
bug in for instance the v2 implementation) or both solvers
("--solver v1 --solver v2"). In the latter case an error is thrown if
the outcome differ.

1 files changed, 13 insertions, 1 deletions

diff --git a/lib/dialyzer/src/dialyzer_options.erl b/lib/dialyzer/src/dialyzer_options.erl
index a1e316d6cc..06672e595f 100644
--- a/lib/dialyzer/src/dialyzer_options.erl
+++ b/lib/dialyzer/src/dialyzer_options.erl
@@ -2,7 +2,7 @@
 %%-----------------------------------------------------------------------
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2006-2011. All Rights Reserved.
+%% Copyright Ericsson AB 2006-2012. All Rights Reserved.
 %%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -196,6 +196,9 @@ build_options([{OptionName, Value} = Term|Rest], Options) ->
       build_options(Rest, Options#options{callgraph_file = Value});
     timing ->
       build_options(Rest, Options#options{timing = Value});
+    solvers ->
+      assert_solvers(Value),
+      build_options(Rest, Options#options{solvers = Value});
     _ ->
       bad_option("Unknown dialyzer command line option", Term)
   end;
@@ -257,6 +260,15 @@ is_plt_mode(plt_remove)   -> true;
 is_plt_mode(plt_check)    -> true;
 is_plt_mode(succ_typings) -> false.
 
+assert_solvers([]) ->
+  ok;
+assert_solvers([v1|Terms]) ->
+  assert_solvers(Terms);
+assert_solvers([v2|Terms]) ->
+  assert_solvers(Terms);
+assert_solvers([Term|_]) ->
+  bad_option("Illegal value for solver", Term).
+
 -spec build_warnings([atom()], [dial_warning()]) -> [dial_warning()].
 
 build_warnings([Opt|Opts], Warnings) ->