[99s-extend] Trying to grok erlang.mk

[Ivan Uemlianin]

Dear Lloyd

I've just tried this with file layout and contents copied from your 
email, and make works fine here I'm afraid.

One odd thing I noticed in your make output ...

 > /min$ make
 >   ERLC   min.erl
 >   APP    min .app.src
 > cat: src/min: No such file or directory
 > cat: .app.src: No such file or directory
 > sed: can't read .app: No such file or directory
 > make: *** [app] Error 2

... is that in the APP line, the filename min.app.src has a space in it, 
and it looks (in the cat lines) like it's broken down into src/min and 
.app.src (ie ./.app.src).  I can't imagine why that's happening, but 
that's what's causing the problem I should think.

 > 2) How can I structure directories and make files for a project
 >    that involves several applications?

I don't know if it's the "correct" way with erlang.mk but, as a refugee 
from rebar, I have apps set out rebar-style and use old-school recursive 
make. e.g.:

max/
   erlang.mk
   Makefile
   apps/
     app1/
       Makefile
       src/
     app2/
       Makefile
       src/

Top level Makefile doesn't need to include erlang.mk, and has lines like:

all:
	$(MAKE) -C apps/app1
	$(MAKE) -C apps/app2

Lower level Makefiles include erlang.mk.

Best wishes

Ivan


On 06/03/2014 20:29, lloyd at writersglen.com wrote:
> Hello,
>
> To secure my understanding of erlang.mk, I've been trying to create the simplest possible example I can imagine. Which gives me this:
>
> min
>     erlang.mk
>     Makefile
>     src
>        min.app.src
>        min.erl
>
> *** Where Makefile is:
>
> PROJECT = min
>
> include erlang.mk
>
> *** min.app.src is:
>
> {application, min,
>           [{description,[]},
>            {vsn,"0.1.0"},
>            {registered,[]},
>            {applications,[kernel,stdlib]},
>            {env,[]},
>            {modules,[]}]}.
>
> *** and min.erl is:
>
> -module(min).
>
> -export([hello/0]).
>
> hello() ->
>     io:format("Hello min!~n~n").
>
> *** But when I call make, I get this:
>
> /min$ make
>   ERLC   min.erl
>   APP    min .app.src
> cat: src/min: No such file or directory
> cat: .app.src: No such file or directory
> sed: can't read .app: No such file or directory
> make: *** [app] Error 2
>
> *** Observations
>
> min.erl compiles just  fine
> min.app.src breaks the compile
>
> *** Questions:
>
> 1) How can I correct this?
> 2) How can I structure directories and make files for a project that involves several applications?
>
> Many thanks,
>
> LRP
>
>
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-- 
============================================================
Ivan A. Uemlianin PhD
Llaisdy
Speech Technology Research and Development

                     ivan at llaisdy.com
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                         festina lente
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