[Scons-users] Controlling display of a builder

[Bill Deegan]

You can change SPAWN just for a single builder invocation..

env.MYBUILDER(target,sources,SPAWN=my_spawn_logic)



On Tue, Oct 20, 2015 at 1:50 AM, Tom Tanner (BLOOMBERG/ LONDON) <
ttanner2 at bloomberg.net> wrote:

> I did try once changing the default SPAWN to not invoke the commands with
> sh -c ...... It works mostly but occasionally there's code that gets very
> upset because it's carefully constructed a string and escaped it...
>
> (posix fork code is somewhat of a mess at the moment).
>
>
> You could change env['SPAWN'] and env['PSPAWN'] to point to your own code
> for that particular builder.
>
>
>
> From: scons-users at scons.org At: Oct 17 2015 19:57:21
> To: scons-users at scons.org
> Subject: Re:[Scons-users] Controlling display of a builder
>
> Hi
>
> I have been using the possibility to pass extra arguments to Command
> to have them used in a builder.  I am doing something like the following:
>
>     scons_subprocess_call = (lambda target, source, env
>
>                                     : subprocess.call(env['ARGS'], source[0]))
>
>     data = env.Command(
>       source = "foo.pl",
>       target = "bar.log",
>       action = scons_subprocess_call,
>       ARGS   = ['homo sapiens', 'Reference GRCh'])
>
> The problem with this is that the output of SCons won't display anything
> useful:
>
>     $ scons
>     [...]
>     scons: Building targets ...
>     <lambda>(["bar.log"], ["foo.pl"])
>     [...]
>
> The main reason I am doing this is to avoid the shell since some of the
> arguments have whitespace, single and double quotes, and even wildcards.
> This makes generation of a command problematic.  I have tried to write my
> own builder but the problem remains.  I create a Builder either by
> setting a `action`, and continue with the problem of not having the actual
> call made displayed, or by setting a `generator`, and face the problem of
> escaping any weird stuff in the arguments.
>
>
> Short of having the builder print() something, is there any way to create
> a Builder that does not boil down to create a command line for the shell,
> while still controlling what SCons displays?
>
> (I am aware that this means that what gets displayed will not match
> a command line.  However, it would still be more informative)
>
> Thank you,
> Carnë
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