dub sub-packages

[Rikki Cattermole via Digitalmars-d-learn]

On 6/05/2015 11:39 p.m., Alessandro wrote:
> Hi everyone,
> I've been learning D for a few months now and really liked it :) !
> Currently I'm experimenting with client/server application
> development using the ZeroMQ library D wrapper called "zmqd".
> Although I could successfully build the basic hello_world
> application with a custom written Makefile using dmd/rdmd, I've
> tried to use the DUB package manager to achieve the same goal,
> but I'm having some issues with it.
> By following the DUB documentation at
> http://code.dlang.org/package-format#build-options I created a
> main dub project called "hello_world" (dub init hello_world) and
> set up two sub-packages therein called "client" and "server" (dub
> init client|server).
> Then I configured the three dub.json files as follows:
> hello_world/dub.json:
> {
>      "name": "hello_world",
>      "description": "Hello World client/server application using ZMQ",
>      "targetType": "none",
>      "dependencies": {
>               "hello_world:client": "*",
>               "hello_world:server": "*"
>      },
>      "subPackages": [
>               "./client/",
>              "./server/"
>       ]
> }
>
> hello_world/client/dub.json:
> {
>      "name": "client",
>      "description": "Hello World client application using ZMQ",
>           "targetType": "executable",
>           "sourceFiles": ["source/hwclient.d"],
>      "dependencies": {
>               "zmqd": "~>1.0.0-alpha"
>      }
> }
>
> hello_world/server/dub.json -> same as above with "server"
> substituting "client"
>
> With this setting, from within "hello_world" directory, I can
> build client and server individually with:
>
> $ dub build hello_world:client
> $ dub build hello_world:server
>
> but when I simply try:
>
> $ dub build
>
> to build the whole thing at once, I get an error saying:
>
> Error executing command build:
> Main package must have a binary target type, not none. Cannot
> build.
>
> But if I change the "targetType" to "executable" or "autodetect"
> in hello_world/dub.json I get the error:
>
> Configuration 'application' of package hello_world contains no
> source files. Please add {"targetType": "none"} to it's package
> description to avoid building it.
> Error executing command build:
> Main package must have a binary target type, not none. Cannot
> build.
>
> What shall I do to have all sub-packages automatically built when
> I build the main package? Is there a way to specify a small bash
> script to have custom commands executed when giving the "dub run"
> command?
>
> Sorry for the long post :( !

$ dub build hello_world:client ; dub build hello_world:server

Dub wasn't meant to build, more or less completely unrelated project 
targets at the same time.