Configuring Lager - I get this error: undefined parse transform 'lager_transform'

Question

I'm testing this https://github.com/saleyn/erws_example on R16B03 (both on windows & Ubuntu)

==> erws_example (compile)
src/erws_handler.erl:none: undefined parse transform 'lager_transform'
ERROR: compile failed while processing /home/charles/erws_example: rebar_abort

I've seen this suggestion http://philipcristiano.com/2013/05/27/ordering-of-rebar-dependencies.html

So far, i'm unable to get any headway.

Thanks.

Transparency

You got error undefined parse transform 'lager_transform' because of option {erl_opts, [{parse_transform, lager_transform}]}. in your rebar.conf file. It says that parse transform will be applied to each module during compilation. But lager_transform function is defined in lager modules which is not yet compiled itself. So probably you should compile lager project manually to avoid this error. – Candra

Answer 1

It seems rebar can not compile parse transforms before compiling everything else (https://github.com/basho/rebar/issues/270). The solution is to compile module with parse transform manually or use file-level parse_transform compiler directive instead of project level.

Candra

Using elixir with a dependency on chatterbox, I had to do the following: ``` mix deps.compile lager mix deps.compile chatterbox ``` – Splenetic

Answer 2

Try to put lager to first position in rebar dependency list. it will fix it. rebar ordering compile dependencies according to this list, not dependency tree))

Bologna

lager already is in the first position in the dependency list. – Revoice