Re: gnat multiarch?

[Ludovic Brenta <ludovic@ludovic-brenta.org>]

On Fri, 16 Sep 2011 08:46:56 -0400, Stephen Leake wrote:
> Ludovic Brenta <ludovic@ludovic-brenta.org> writes:
> > Remember that multiarch impacts only the run-time library
> > packages, not the -dev packages i.e. gnat-4.6 in this particular
> > case, so the path to the *sources* of the RTS is unchanged while
> > the RTS itself moved to /usr/lib/i386-linux-gnu/libgnat-4.6.so.1
> > as part of the transition to multiarch.  If gprbuild only needs
> > to know where gnat looks for the sources of its RTS, maybe the
> > best is to ask gnat? i.e. at package build time:
> >
> > # -*- Makefile -*-
> > RTS := $(dir $(shell gnatls -a -s system.o))
> >
> > Would that work?
>
> Hmm. I guess it's more complicated than I thought.
>
> gprbuild needs to find the list of installed runtime options; sjlj,
> zxp etc. I'm not at my Debian system right now; I'll investigate
> more later.

My hunch is that you can see both run-time systems with

# -*- Makefile -*-
RTS_ZCX  := $(dir $(shell gnatls -a -s system.o))
RTS_SJLJ := $(dir $(shell gnatls --RTS=rts-sjlj -a -s system.o))

or perhaps

RTS_ROOT := $(dir $(dir $(shell gnatls -a -s system.o)))
RTS_LIST := $(wildcard $(RTS_ROOT)/rts-*)

Note that I split the SJLJ runtime, which is seldom needed, into a
dedicated package gnat-4.6-sjlj.  You may want gprbuild to
build-depend on it.

--
Ludovic Brenta.