Error when compiling on Windows 7, missing module :cowboy_req

[tinat]

Hi,
I am encountering this error in Windows 7 with most current master on Elixir (VERSION=0.12.2-dev) .

I ran in the Windows Command Shell prompt:

mix new test_plug
cd test_plug

modified mix.exs to have the following snippets:

def application do
[ applications: [:cowboy, :plug],
mod: { TestPlug, [] }]
end

defp deps do
[ { :cowboy, github: "extend/cowboy" },
{ :plug, github: "elixir-lang/plug" } ]
end

then ran:

mix deps.get

And get the following error:

== Compilation failed ==
Compilation failed on the following files:

• lib/plug/adapters/cowboy/connection.ex is missing module :cowboy_req
• lib/plug/adapters/cowboy/handler.ex is missing module :cowboy_req

The first failure is shown below...
== Compilation error on file lib/plug/adapters/cowboy/connection.ex ==
could not compile dependency plug, mix compile failed. You can recompile this dependency with mix deps.compile plug or update it with mix deps.update plug
** (CompileError) deps/plug/lib/plug/adapters/cowboy/connection.ex:5: module :cowboy_req is not loaded and could not be found
(elixir) src/elixir_exp.erl:95: :elixir_exp.expand/2
(stdlib) lists.erl:1339: :lists.mapfoldl/3
(stdlib) lists.erl:1340: :lists.mapfoldl/3
(elixir) src/elixir_exp.erl:43: :elixir_exp.expand/2
(elixir) src/elixir.erl:150: :elixir.quoted_to_erl/3

Thanks!
Tina

[josevalim]

Thanks Tina! A couple questions:

If you run, mix deps.get cowboy does it work?
What about mix deps.compile cowboy?
Finally, can you see a bunch of .beam files at plug/_build/shared/lib/cowboy/ebin?

[tinat]

I ran

mix deps.compile cowboy

which worked, but the *.beam files are in test_plug/_build/shared/lib/cowboy/ebin/ebin

Yes, there is a ebin directory UNDER the ebin directory for _build/shared/lib/cowboy, _build/shared/lib/cowlib, and _build/shared/lib/ranch and the beam files are in the nested (second) ebin directory

This is only for Windows -- using Elixir 0.12.2-dev

This does not happen on the Mac (I have both) and using Elixir 0.12.2-dev on both machines. I got some errors when I compiled Elixir 0.12.2-dev on Windows too. I compiled Elixir by clone the repo, and then running msys.bat (as Administrator) in the DevKit directory that came with RailsInstaller2.2.1 and running

make test

I installed Erlang via the otp_win64_R16B02.exe installation

Thanks for your attention. I can do anything testing you need.
Tina

[tinat]

A little more information, I copied all the beam files from ebin/ebin directory to ebin directory
and then ran

mix deps.compile plug

And that worked

But if I just ran

mix deps.compile cowboy

again, I get the error:

** (File.Error) could not remove files and directories recursively from c:/apps/test_plug/_build/shared/lib/cowboy/ebin: file already exists
(elixir) lib/file.ex:726: File.rm_rf!/1
(mix) lib/mix/utils.ex:334: Mix.Utils.symlink_or_copy/2
(mix) lib/mix/project.ex:278: Mix.Project.build_structure/2
(elixir) lib/file.ex:913: File.cd!/2
(mix) lib/mix/tasks/deps.compile.ex:176: Mix.Tasks.Deps.Compile."-build_structure/2-fun-0-"/3
(elixir) lib/enum.ex:517: Enum."-each/2-lists^foreach/1-0-"/2
(elixir) lib/enum.ex:517: Enum.each/2
(mix) lib/mix/tasks/deps.compile.ex:71: Mix.Tasks.Deps.Compile."-do_run/2-fun-0-"/4

[josevalim]

It should be fixed in Elixir master. :) I think that you are already using master, so you just need to update your git checkout and do a make clean compile.

Your reports have been a great help, thank you!

[tinat]

Jose, thanks for the super-duper quick fix. It worked. No more nested ebin directories!

I did have to compile cowboy explicitly. As in:

mix deps.get # fetched all dependencies from git -- got the same error
mix deps.compile cowboy # cowlib and ranch compiled but cowboy was skipped
mix deps.compile plug # Success!

Thanks and thanks for Elixir -- I am enjoying it -- much better than Erlang, especially for a Rubyist like me.

[josevalim]

Glad to know! Thanks for your help!