FreeTDS Development Group

[Brian Bruns <camber AT ais.org>]

I have no idea, how's that?  I have no attachments to anything that might 
be in the Makefile's so feel free to import whatever solution works.

Brian

On Fri, 5 Jul 2002, James K. Lowden wrote:

> Makefilers, 
> 
> Further testing reveals former testing was incomplete.  I came across a
> couple of Gnuism in the FreeTDS Makefile's.  The same fellow who sent the
> previous patches had some questions, which I couldn't answer.  I hope
> someone here (Brian, probably) can.  See below (my comments are prepended
> with ">").  
> 
> --jkl
> 
> > "make include" relies on the Implicit Variable $(RM).  I don't know why;
> > many of the Makefile's don't do that.  
> 
> autoconf/automake can be used to automatically create a RM make variable
> in all of the generated Makefiles.  I'll work on it and send you a patch.
> 
> > The src/tds/Makefile is more baffling.  It gets stuck on "mem.lo".  I've
> > attached the behavior.  It looks to me like BSD make can't find this
> > pattern rule:
> > 
> > %.o: %.c
> >         @echo '$(COMPILE) -c $<'; \
> >         $(COMPILE) -Wp,-MD,.deps/$(*F).pp -c $<
> >         @-cp .deps/$(*F).pp .deps/$(*F).P; \
> >         tr ' ' '\012' < .deps/$(*F).pp \
> >           | sed -e 's/^\\$$//' -e '/^$$/ d' -e '/:$$/ d' -e 's/$$/ :/' \
> >             >> .deps/$(*F).P; \
> >         rm .deps/$(*F).pp
> > 
> > I can't find anything in src/tds/Makefile.am that about that.  
> 
> "%.o: %.c" is a GNU make construct.  Actually, that whole rule looks
> pretty evil...can you explain what it's trying to do?  From my quick read
> of it, it looks like the rule is trying to dynamically update the
> dependencies for the Makefile.  This is quite hard to do portably.  Most
> other software rely on a separate program "makedepend" and an appropriate
> "depend" target in the Makefile to do this statically whenever the
> developer thinks that it needs to be run.  I recommend that freetds do
> this as well, unless there is some technical reason why the status quo
> exists.