[Scons-users] Attaching an emitter to an existing builder

[Bill Deegan]

Jeremy,

Greetings!
You're not the first to mention adding the map file as a side effect. (or
target)
Please go ahead and file and Issue on github for this.
Ideally with a simple example, what the gcc flag is, and what the file
naming/location would be?

So likely the easiest way to add an emitter to Program() would be the
following (not tested)

env.Append(PROGEMITTER = [my_map_emitter])

Give that a try and let us know if it works for you?

Also there's a discord server for scons help if you'd like to ask
questions/get help there.
https://discord.gg/bXVpWAy

Hope that helps!
-Bill

On Wed, Jan 27, 2021 at 1:31 PM Jeremy Elson <jelson at gmail.com> wrote:

> Hi scons gurus,
>
> Is there a way to attach an emitter to a pre-existing builder? I know how
> to create my own custom Builders that have emitters, but I'm trying to add
> an emitter to one of the standard builders that comes with SCons. I see a
> function in Builder called add_emitter, so I tried this:
>
>         def map_emitter(target, source, env):
>             print("emitter is being called")
>
>         env["BUILDERS"]["Program"].add_emitter(
>             suffix = ".map",
>             emitter = map_emitter)
>
> But it throws an exception:
>
> TypeError: 'EmitterProxy' object does not support item assignment
>
> I'm using the standard SCons Program() Builder to build my program. But I
> am also passing a linker option in LINKFLAGS so that when gcc is called at
> the link stage, it generates both the program binary as its main output and
> also an extra file (a .map file) that contains linker symbol metadata. I
> want SCons to understand this side-effect so that if the map file gets
> deleted, scons will run gcc again to regenerate it.
>
> Thanks!
>
> -Jeremy
>
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