In my application I'm using this implementation of erlang-iconv. Simple test suite:
-module(example_SUITE).
-include_lib("common_test/include/ct.hrl").
-export([all/0, suite/0, init_per_suite/1, end_per_suite/1,
simple_test_case/1]).
all() ->
[simple_test_case].
suite() ->
[{timetrap, {minutes, 1}}].
init_per_suite(Config) ->
application:start(iconv),
Config.
end_per_suite(Config) ->
application:stop(iconv),
Config.
simple_test_case(_Config) ->
ok.
On attempt to run this suite:
ct_run -pa ebin/ deps/*/ebin/ deps/*/deps/*/ebin/ -dir test/ -logdir logs/ -suite example_SUITE
...
=INFO REPORT==== 23-Mar-2014::19:45:30 ===
application: iconv
exited: {{shutdown,
{failed_to_start_child,iconv,
{{case_clause,{error,{open_error,-10}}},
[{iconv,init,1,[{file,"src/iconv.erl"},{line,49}]},
{gen_server,init_it,6,
[{file,"gen_server.erl"},{line,304}]},
{proc_lib,init_p_do_apply,3,
[{file,"proc_lib.erl"},{line,239}]}]}}},
{iconv_app,start,[normal,[]]}}
type: temporary
Testing web.wasearch.example_SUITE: TEST COMPLETE, 1 ok, 0 failed of 1 test cases
....
This error is kind of obvious because erlang-iconv depend on C drive in its priv_dir:
init([]) ->
case erl_ddll:load_driver(get_so_path(), iconv_drv) of
ok -> ok;
{error, already_loaded} -> ok
end,
Port = open_port({spawn, "iconv_drv"}, []),
ets:new(iconv_table, [set, public, named_table]),
ets:insert(iconv_table, {port, Port}),
{ok, Port}.
get_so_path() ->
case code:priv_dir(iconv) of
{error, _} -> "./priv";
Path -> Path
How can I trick erlang-iconv and force it to look up C driver in other location (absoulute path to iconv's priv_dir in my project's deps directories)?
Shot from the hip: Set ERL_LIBS appropriately.
Your priv_dir should be set up correctly and belong to the iconv application, but since the Erlang system did not pick that up, I am guessing your -pa adds doesn't track this. Setting ERL_LIBS to include deps might do the trick for the build.