[Scons-users] How to correctly use emitters

[William Blevins]

Pierre-Luc,

Here are some references:
User Guide on Emitter: http://www.scons.org/doc/HTML/scons-user/ch18s06.html
Wiki for custom builders: https://bitbucket.org/scons/
scons/wiki/ToolsForFools

You may have pasted the same tree twice. They look the same at a glance.

1. It should only depend on the original properties of the actual parameter
"target". I assume the return is different, so you get different results ;)
2. The only difference would result from the difference of target between
methods 1 and 2. They must not yield the same result.
3. All emitted targets should be Clean targets by default. Please read the
tools for fools. It will set you straight :)
4. Unless you have special targets such as side-effects, I would expect all
targets to be Clean targets by default.

V/R,
William

On Tue, Oct 25, 2016 at 11:29 AM, Pierre-Luc Boily <
pierreluc.boily at gmail.com> wrote:

> Hello,
>
> I am having trouble understand emitters.
>
> I have this emitter  here <http://pastebin.com/Y7H6LPe0>  being call from
> a
> builder in my sconscript  here <http://pastebin.com/M3JT3Rga>  .  As you
> can
> see, I use the target and append to it new targets.  This lead to a weird
> behavior.  If you check my tree  here <http://pastebin.com/vnZBMHx6>  ,
> there is a target call /command/, but this target does not exist!  It looks
> like coming from a file name from source that I specified in sconscript,
> /commands.grammar/
>
> If I changed the emitter to have something like this instead :
> /def _emit_build_grammar(target, source, env):
>     files = [
>       env['ENV']['LOCALROOT'] + '/sr/sra/src/grammars/' +
> env['ENV']['LANGUAGE'] + '/' + env['ENV']['GRAMMAR_NAME'] +
> '/faa.autopron',
>       env['ENV']['LOCALROOT'] + '/sr/sra/src/grammars/' +
> env['ENV']['LANGUAGE'] + '/' + env['ENV']['GRAMMAR_NAME'] + '/faa.missing',
>       env['ENV']['LOCALROOT'] + '/sr/sra/src/grammars/' +
> env['ENV']['LANGUAGE'] + '/' + env['ENV']['GRAMMAR_NAME'] +
> '/faa.functions']
>     return files, source/
>
>  then, my tree looks better <http://pastebin.com/U2iTtWXf>  ! (Still have
> a
> /command /folder, but not as target anymore)
>
> So, question :
> 1 - When, for my emitter,  should I append to target new targets and when
> should I override?
> 2 - Why when I append, I have this weird behavior where I have a target
> named /command/?
> 3 - I have a lot of binaries files generated by this builder and lot of
> files copied.  Should I use emitter or Clean to get them removed?
> 4 - And actually, when should I use emitter vs Clean?  in my example above,
> those file are generated by a perl script.  I feel that have them removed
> by
> Clean should be good enough.
>
> Thank you for your patience!
>
> Pierre-Luc
>
>
>
> --
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