[Scons-users] Question on custom builder

[syost at triad.rr.com]

---- Bill Deegan <bill at baddogconsulting.com> wrote: 
> Can you share udb_precompile?
> Also please share your emitter.
> 
> On Fri,

Sorry for the delay - holidays and all.   The builder used to create a script file on the fly with all the sources and commands and then execute that; saving lots of time.   But once I added the emitter, the targets are wrong if I pass more than one source file to the builder.   So now I execute the builder for each source in a for-in loop.  

def udb_precompile( target, source, env ):
    stringTargets=', '.join(map(lambda f: str(f), target))
    stringSources=', '.join(map(lambda f: str(f), source))
    myDebugPrint("udb precompile parameters:",target=stringTargets, source=stringSources)
    ######################
    # target isnt real here - emiiter below really modifies it
    ######################
    for udbFile in source:
        rootPath,fileName = os.path.split(str(udbFile))
        rootName,suffix = os.path.splitext(fileName)
        udbPackageName = dirname(str(udbFile))+"/"+rootName
        udbBindFileName = dirname(str(udbFile))+"/"+ rootName + ".bnd"
        myFileName = str(udbFile)
        myDebugPrint("=======>>>   UDB Precompiling ===>>> ", myFileName=myFileName )
        subprocess.call([ '/home/db2inst1/sql_udb_prep', myFileName, udbPackageName, udbBindFileName, str(uuid.uuid4())])

    return None

def udb_emitter( target, source, env ):
    #Check empty sources here - emitter will see it before the builder
    if 0 == len(source):
        print("UDBPrepcompile called without sources - probably an error in your SConscript")
        sys.exit(-1)
    freshStart = True
    for udbFile in source:
        rootPath,fileName = os.path.split(str(udbFile))
        rootName,suffix = os.path.splitext(fileName)
        udbBindFileName = rootName+".bnd"
        myDebugPrint("=======>>>   UDB Emitter ===>>> ", udbBindFileName=udbBindFileName, udbfile=str(udbFile) )
        target.append(udbBindFileName)

    return target, source

---- Bill Deegan <bill at baddogconsulting.com> wrote: 
> Can you share udb_precompile?
> Also please share your emitter.
> 
> On Fri, Dec 22, 2017 at 8:45 AM, <syost at triad.rr.com> wrote:
> 
> > I have the following code
> >
> > myBld = Builder(action = udb_precompile,
> >                 suffix='.c',
> >                 src_suffix='.sc',
> >                 emitter = udb_emitter)
> > rootEnv.Append( BUILDERS = {'UDBPrep' : myBld } )
> >
> > I call it like so:
> > newlyCreatedTargets = UDBPrep(Glob('*.sc'))
> >
> > The builder function simply calls a script with each source as a parameter
> > and the emitter simply adds the secondary target that is also created
> > ("*.bnd" suffix) by the script using target.append().  The target list ends
> > up like this:
> >
> > source=[files.sc, file2.sc, file3.sc]
> > target=[file1.c, file1.bnd, file2.bnd, file3,bnd]
> >
> > as you can see, I don't have all my *.c targets in the target list - just
> > the first one (they do get created by the script).  If I call the builder
> > individually for each source file it works perfect but I take a performance
> > hit for this.  Any ideas?
> >
> > Thanks in advance!!!!
> >
> > Spencer
> > _______________________________________________
> > Scons-users mailing list
> > Scons-users at scons.org
> > https://pairlist4.pair.net/mailman/listinfo/scons-users
> >