re: toolchain/52834: NetBSD/sparc cross-build failure

[matthew green <mrg%eterna.com.au@localhost>]

clare%csel.org@localhost writes:
> On Sun, 17 Dec 2017 15:45:01 +0000 (UTC)
> Robert Elz <kre%munnari.OZ.AU@localhost> wrote:
> 
> >    | i thought OBJMACHINE="yes" was sufficient to separation of objdir,
> >  
> >  I think that might happen if you use -M rather than -O to set the objdir
> >  location.   I prefer to have more control over where things are put, so
> >  I have never used that method...
> 
> both -M and -O itself does not separate objdir per $machine for me,
> but build problem was solved by fixing scripts...

it can -- as long as you include the right stuff in the value.
it's a make variable, so it can be quite complex.  i use this:

   /var/obj/${MACHINE}${MACHINE_ARCH:N${MACHINE}:C/(.)/-\1/}

which gives me eg /var/obj/sparc, etc, for MACHINE=MACHINE_ARCH,
and eg /var/obj/amd64-x86_64 for others.  i have a variant that
tries to guess gcc vs clang, but ACTIVE_CC isn't set early
enough in all cases.  (i am an MAKEOBJDIRPREFIX user, fwiw.)

i also try to *always* build from a read-only mount of the srcs
which avoids or clearly fails many types of issues.


.mrg.