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Re: powerpc64le multilibs and multiarch dir


On Thu, Aug 22, 2013 at 10:06:48AM -0400, David Edelsohn wrote:
> On Wed, Aug 21, 2013 at 11:57 PM, Alan Modra <amodra@gmail.com> wrote:
> 
> > Index: gcc/config/rs6000/t-linux64
> > ===================================================================
> > --- gcc/config/rs6000/t-linux64 (revision 201834)
> > +++ gcc/config/rs6000/t-linux64 (working copy)
> > @@ -25,8 +25,8 @@
> >  # it doesn't tell anything about the 32bit libraries on those systems.  Set
> >  # MULTILIB_OSDIRNAMES according to what is found on the target.
> >
> > -MULTILIB_OPTIONS        = m64/m32
> > -MULTILIB_DIRNAMES       = 64 32
> > -MULTILIB_EXTRA_OPTS     = fPIC
> > -MULTILIB_OSDIRNAMES    = ../lib64$(call if_multiarch,:powerpc64-linux-gnu)
> > -MULTILIB_OSDIRNAMES    += $(if $(wildcard $(shell echo $(SYSTEM_HEADER_DIR))/../../usr/lib32),../lib32,../lib)$(call if_multiarch,:powerpc-linux-gnu)
> > +MULTILIB_OPTIONS    := m64/m32
> > +MULTILIB_DIRNAMES   := 64 32
> > +MULTILIB_EXTRA_OPTS :=
> > +MULTILIB_OSDIRNAMES := m64=../lib64$(call if_multiarch,:powerpc64-linux-gnu)
> > +MULTILIB_OSDIRNAMES += m32=$(if $(wildcard $(shell echo $(SYSTEM_HEADER_DIR))/../../usr/lib32),../lib32,../lib)$(call if_multiarch,:powerpc-linux-gnu)
> 
> What is the purpose of the change to MULTILIB_OSDIRNAMES? Why the
> addition of m64= and m32=? A secondary tmake file is not always set to
> post-process those macros, AFAICT.

That m64= is the newer syntax that specifies a mapping from a
MUTLILIB_OPTIONS selection.  And, yes, without another tmake file this
gives us exactly the same result as before.

I needed to use the new syntax to specify the correct os dirs when
adding cross-endian multilibs.

-- 
Alan Modra
Australia Development Lab, IBM


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