Re: help with first Swarm app

[Rob Kewley]

Alex Lancaster wrote:
 
> We are working on a solution to this problem.  Most likely we would
> make the second and third categories be treated the same by the
> linking process.  This has not affected most people so far, for two
> reasons:
> 
> 1. as those folks who choose an archive install should are mostly be
> aware of the consequences - a good understanding of how to control
> over Makefile.conf parameters to override should be a prerequisite for
> all folks wanting to take this road!
> 
> 2. only a few users have taken the time to create their own libraries
> when creating Swarm applications - most write a single application
> which they link against the Swarm libraries.  I heartily encourage
> more people to go the modular way - it can result in re-usable chunks
> that you can contribute back!
> 
> However, I agree that this is particulary quirky problem and I think
> it is a good time to review the status of the space library and other
> interdependencies.  It has concerned me that the space library has
> been in kind of limbo for a while.
> 
> My idea is to have create a new type of macro, use:
> 
> 1. keep APPLIBS for optional libraries that are part of the binary
>    distribution and;
> 
> 2. make a new USERLIBS macro (say) for -lneuro, -lga and
>    user-developed libraries, to avoid these libraries being undefined at
>    link time.
> 

Based on the above, I resubmit an example Makefile and accompanying
changes to Makefile.conf which support linking against user developed
libraries and, as in this case, other useful libraries for an
application.

I have added a couple of lines to an application Makefile and
Makefile.conf which make it easy to link a swarm application against an
existing library (without having to edit OTHERINCDIRS and OTHERLIBDIRS)
in Makefile.conf each time.  These changes along with a couple lines of
instruction may be a useful addition to the Swarm distribution.

I added the variable APPLIBDIRS and APPINCDIRS to Makefile as shown
below:

SWARMHOME=/usr/local/swarm-1.0.5
APPLICATION=battle
OBJECTS=Location.o MilMap.o BatSummary.o Order.o Coa.o UnitOrg.o
TaskOrg.o UnitCdr.o BattleStats.o BatModSwarm.o Combatant.o
BatObsSwarm.o CoaGenome.o MapDisplay.o GraphicControlMeasure.o
PointGraphic.o PolygonGCM.o main.o DynMatrix.o trig.o
APPLIBS= -lspace -lmylib /home/kewler/GCTP/gctpc/source/geolib.a
APPINCDIRS= -I/home/kewler/GCTP/gctpc/source/
APPLIBDIRS=
include $(SWARMHOME)/Makefile.appl

...

I edited line 469 of Makefile.conf as follows:

CFLAGS= $(OPTFLAGS) $(WARNFLAGS) -I$(INCDIR) $(OTHERINCDIRS)
$(APPINCDIRS) $(EXTRACFLAGS)


and line 480 as follows:

MINLDFLAGS=     -L$(LIBDIR) $(OTHERLIBDIRS) $(APPLIBDIRS)
$(EXTRALDFLAGS)

Rob Kewley

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