I’m struggling with dialyzer from linux command line, no mix.
First I have to build PLT but I have no idea what are the needed parameters. I have tried (output edited for readability):
$ dialyzer --build_plt --apps kernel
Creating PLT /home/jani/.dialyzer_plt ...
Unknown functions:
atomics:info/1 (erl_erts_errors.erl:68:9)
beam_lib:chunks/2 (code.erl:872:10)
beam_lib:md5/1 (code.erl:1082:10)
binary:decode_unsigned/1 (net_kernel.erl:1754:14)
binary:match/2 (os.erl:385:10)
[..]
unicode:latin1_chardata/0 (rpc.erl:1377:16)
done in 0m9.24s
done (passed successfully)
But it reports huge amount of unknown functions and types. Is that ok?
Anyway the following binary file is created:
$ l ~/.dialyzer_plt
.rw-rw-r-- 359k jani jani 2023-01-20 11:22 /home/jani/.dialyzer_plt
This is my test code:
defmodule TypeSpecExample do
@spec add(a :: integer, b :: integer) :: integer
def add(a, b), do: a + b
@spec sub(a :: integer, b :: integer) :: integer
def sub(a, b), do: a - b
end
Compiles fine:
$ elixirc TypeSpecExample.ex
$ l *TypeSpecExample*
.rwxrwx--- 1,6k root vboxsf 2023-01-20 11:30 Elixir.TypeSpecExample.beam*
.rwxrwx--- 190 root vboxsf 2023-01-20 11:13 TypeSpecExample.ex*
When I run dialyzer I get this output telling me nothing but that I don’t know how to use it 
$ dialyzer Elixir.TypeSpecExample.beam
Checking whether the PLT /home/jani/.dialyzer_plt is up-to-date... yes
Proceeding with analysis...=ERROR REPORT==== 20-Jan-2023::11:31:59.637815 ===
Error in process <0.82.0> with exit value:
{undef,
[{elixir_erl,debug_info,
[core_v1,'Elixir.TypeSpecExample',
{elixir_v1,
#{after_verify => [],attributes => [],compile_opts => [],
definitions =>
[{{sub,2},
def,
[{line,6}],
[{[{line,6}],
[{a,[{version,0},{line,6}],nil},
{b,[{version,1},{line,6}],nil}],
[],
{{'.',[{line,6}],[erlang,'-']},
[{line,6}],
[{a,[{version,0},{line,6}],nil},
{b,[{version,1},{line,6}],nil}]}}]},
{{add,2},
def,
[{line,3}],
[{[{line,3}],
[{a,[{version,0},{line,3}],nil},
{b,[{version,1},{line,3}],nil}],
[],
{{'.',[{line,3}],[erlang,'+']},
[{line,3}],
[{a,[{version,0},{line,3}],nil},
{b,[{version,1},{line,3}],nil}]}}]}],
deprecated => [],
file =>
<<"/media/sf_src/other/elixir-in-action/TypeSpecExample.ex">>,
is_behaviour => false,line => 1,
module => 'Elixir.TypeSpecExample',
relative_file => <<"TypeSpecExample.ex">>,struct => nil,
unreachable => []},
[{attribute,5,spec,
{{sub,2},
[{type,5,'fun',
[{type,5,product,
[{ann_type,5,[{var,5,a},{type,5,integer,[]}]},
{ann_type,5,[{var,5,b},{type,5,integer,[]}]}]},
{type,5,integer,[]}]}]}},
{attribute,2,spec,
{{add,2},
[{type,2,'fun',
[{type,2,product,
[{ann_type,2,[{var,2,a},{type,2,integer,[]}]},
{ann_type,2,[{var,2,b},{type,2,integer,[]}]}]},
{type,2,integer,[]}]}]}}]},
[no_copt,to_core,binary,return_errors,no_inline,strict_record_tests,
strict_record_updates,dialyzer,no_spawn_compiler_process]],
[]},
{dialyzer_utils,get_core_from_beam,2,
[{file,"dialyzer_utils.erl"},{line,119}]},
{dialyzer_analysis_callgraph,compile_byte,5,
[{file,"dialyzer_analysis_callgraph.erl"},{line,419}]},
{dialyzer_worker,loop,2,[{file,"dialyzer_worker.erl"},{line,90}]}]}
dialyzer: Analysis failed with error:
{undef,
[{elixir_erl,debug_info,
[core_v1,'Elixir.TypeSpecExample',
{elixir_v1,
#{after_verify => [],attributes => [],compile_opts => [],
definitions =>
[{{sub,2},
def,
[{line,6}],
[{[{line,6}],
[{a,[{version,0},{line,6}],nil},
{b,[{version,1},{line,6}],nil}],
[],
{{'.',[{line,6}],[erlang,'-']},
[{line,6}],
[{a,[{version,0},{line,6}],nil},
{b,[{version,1},{line,6}],nil}]}}]},
{{add,2},
def,
[{line,3}],
[{[{line,3}],
[{a,[{version,0},{line,3}],nil},
{b,[{version,1},{line,3}],nil}],
[],
{{'.',[{line,3}],[erlang,'+']},
[{line,3}],
[{a,[{version,0},{line,3}],nil},
{b,[{version,1},{line,3}],nil}]}}]}],
deprecated => [],
file =>
<<"/media/sf_src/other/elixir-in-action/TypeSpecExample.ex">>,
is_behaviour => false,line => 1,
module => 'Elixir.TypeSpecExample',
relative_file => <<"TypeSpecExample.ex">>,struct => nil,
unreachable => []},
[{attribute,5,spec,
{{sub,2},
[{type,5,'fun',
[{type,5,product,
[{ann_type,5,[{var,5,a},{type,5,integer,[]}]},
{ann_type,5,[{var,5,b},{type,5,integer,[]}]}]},
{type,5,integer,[]}]}]}},
{attribute,2,spec,
{{add,2},
[{type,2,'fun',
[{type,2,product,
[{ann_type,2,[{var,2,a},{type,2,integer,[]}]},
{ann_type,2,[{var,2,b},{type,2,integer,[]}]}]},
{type,2,integer,[]}]}]}}]},
[no_copt,to_core,binary,return_errors,no_inline,strict_record_tests,
strict_record_updates,dialyzer,no_spawn_compiler_process]],
[]},
{dialyzer_utils,get_core_from_beam,2,
[{file,"dialyzer_utils.erl"},{line,119}]},
{dialyzer_analysis_callgraph,compile_byte,5,
[{file,"dialyzer_analysis_callgraph.erl"},{line,419}]},
{dialyzer_worker,loop,2,[{file,"dialyzer_worker.erl"},{line,90}]}]}
Last messages in the log cache:
Reading files and computing callgraph...
