[erlang-questions] Building C code in dep with rebar3: c_src not found

[Bryan Paxton]

 Hi,

 Is this a directory with a set of apps in it or is this an umbrella?
(i.e., you have a top level rebar.config). AFAIK there's only two ways
you can have local dependencies like this... in an umbrella or using
checkout dependencies.

Either way could you share the rebar config for project B? In some loose
form that is.

 I just made an umbrella using rebar3 and could not replicate the issue.
Note that in an umbrella I must be top level when running rebar3
compile, etc.

--

Bryan


On 1/23/19 6:58 PM, Igor Clark wrote:
> Reading it back, I'm not sure if I made this very clear:
>
> - project A is an OTP app containing C port code in c_src, and the
> above rebar.config with port compiler info
> - project B is another OTP app referencing project A as a source
> dependency in project B's rebar config
> - when I build project A in its own dir with 'rebar3 compile', it
> compiles the C code as expected
> - when I build project B in its own dir with 'rebar3 compile', it
> recognises the port compiler dependency in project A's rebar.config,
> downloads and compiles it, but then fails to compile project A as a
> dep, saying "found no source files"
>
> So I need some way for the port compiler, when running in the context
> of the parent app A, to know the proper path for 'c_src' inside the
> source dependency B. Can't see how it could be any problem with the
> port compiler, not least because jiffy uses it fine, so I must be
> missing something!
>
> Incidentally I added CXXFLAGS to the port_env as well, but no
> difference, as expected. Clutching at straws somewhat there. ;-)
>
> I also tried using a Makefile, which I guess is the intended rebar3
> way, and that seems to work - but I'd love to know what's happening here.
>
> Cheers,
> Igor
>
>
>
> On Wed, Jan 23, 2019 at 7:35 PM Igor Clark <igor.clark@REDACTED
> <mailto:igor.clark@REDACTED>> wrote:
>
>     Hi everyone,
>
>     I have an simple app which has a C port in it. I have a
>     rebar.config from which it builds correctly when I run 'rebar3
>     compile' inside the app directory:
>
>     > { erl_opts, [debug_info] }.
>     > { deps, [] }.
>     >
>     > { plugins, [
>     >       { pc, { git, "https://github.com/blt/port_compiler.git", {
>     tag, "v1.10.1" } } }
>     > ] }.
>     >
>     > { provider_hooks, [
>     >       { pre, [
>     >               { compile, { pc, compile }},
>     >               { clean, { pc, clean }}
>     >       ] }
>     > ] }.
>     >
>     > { port_specs, [
>     >       { "priv/bin/my_port_binary", [
>     >               "c_src/my_c_file.1.c",
>     >               "c_src/subdir/my_c_file_2.c"
>     >       ] }
>     > ] }.
>     >
>     > { port_env, [
>     >       { "CFLAGS", "$CFLAGS -Ic_src/ -g -Wall -Werror -O2" }
>     > ] }.
>
>
>     Compiling this works fine. The artifact is created in priv/bin,
>     and running myapp:module_info() inside the shell shows the right
>     details.
>
>     However, when I try to include this app as a dependency, I get
>     this error:
>
>     > ===> Found no source files for:
>     > "c_src/my_c_file.1.c"
>     > ===> Found no source files for:
>     > "c_src/subdir/my_c_file_2.c"
>
>
>     I've included src, c_src and rebar.config in the 'files' entry in
>     src/my_app.app.src.
>
>     I've also included a jiffy dep as a test to make sure C code gets
>     built correctly, and that works fine, but I can't see what jiffy's
>     config has that I don't.
>
>     Anyone know what I'm missing to make this work?
>
>     Thanks very much!
>     Igor
>
>
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