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Subject: Re: [Boost-build] Advanced generators, chaining them together...
From: Alexander Sack (pisymbol_at_[hidden])
Date: 2009-01-20 09:01:09

On Mon, Jan 19, 2009 at 8:19 PM, Steven Watanabe <watanabesj_at_[hidden]> wrote:
> Alexander Sack wrote:
>> I'm still trekking along converting our internal builds to use bjam to
>> evangelize the tool amongst the unaware! I've run across an
>> interesting build scenario. I have a build target that works like
>> using some custom GNUMake shell commands:
>> m4 file.m4 > file.cfg
>> (simple enough)
>> Then a custom tool is built (binary), call it foogen which is then
>> used to do the following:
>> foogen file.cfg
>> foogen file.cfg
>> foogen file.cfg s3.h
>> etc. etc.
>> Then those generated source files,,, s3.h etc. are ALL
>> used in the creation of a library. I was wondering is it worth trying
>> to make this a generator or at least two generators chained together?
>> I'm not sure how to go about this just yet. I thought I had something
>> then I realized it would still not work for what I have.
>> I've created some custom generators to do simple conversions but this
>> contains a level of indirection which complicates it a bit. What
>> makes it worst is that technically the tool will create ALL source
>> files from just doing:
>> foogen file.cfg
>> [a bunch of source files are produced, how to I tell boost-build that
>> when you run this you will produce a bunch of CPP/H files used for
>> compilation?]
>> I was thinking perhaps of just doing the m4 stuff manually (notfile
>> etc.) and then trying to use a generator for the file.cfg type so I
>> can just put that in my library statement (however if the m4 file
>> changes, then I need to full rebuild to pick it up).
>> Has anyone ran into this kind of build scenario before? Currently I
>> have this working with notfiles which is fine but really not much
>> better than the GNUMakefile shell commands we had before.
>> Any suggestions would be greatly appreciated,
>> -aps
>> PS Is there any example of this in the boost-build tree, I was digging
>> into tools/*.jam etc
> I don't see a good way to handle this. The problem is that
> to fully automate this, you can't create the targets for the headers and
> source files until you have updated file.cfg, right? bjam doesn't allow
> new targets to be created after it begins updating targets.

Ahhh then that answers at least one of my questions, I can't create
new targets after updating existing ones.

Is there a way though to just work with my foocfg.cfg file and create
many CPP files that could be used to link against to form a library?
The catch here is I also have to build the executable to process
foocfg.cfg file (but I started a thread about that and you had a patch
and Volodya gave me an example which I still have to parse and apply
to my situation).


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