It does work if you also add $LD_LIBRARY_PATH to LD_LIBRARY_PATH_64. I
have tested this, i.e. MPIR now builds and all tests now pass on t2,
so at least there is no problem for Sage.

We do not use the latest libtool. I tried upgrading it once before,
and not only could I not understand the documentation, but in the end,
I completely, abjectly failed. When I first started working on MPIR I
spent almost 3 months full time working on the build system of MPIR.

Bill.

On Jan 29, 3:37 pm, "Dr. David Kirkby" <david.kir...@onetel.net>
wrote:
> Bill Hart wrote:
> > Ah, got it. LD_LIBRARY_PATH_64 needs to also contain
> > /home/wbhart/mpir-1.3.0/.libs. Basically if LD_LIBRARY_PATH_64 is not
> > specified at all, i.e. left blank, the linker uses whatever is in
> > LD_LIBRARY_PATH. Otherwise it uses LD_LIBRARY_PATH_64 exclusively,
> > which means that *all* 64 bit library paths must be in
> > LD_LIBRARY_PATH_64.
>
> > So, in order to make MPIR work on t2, we'd need LD_LIBRARY_PATH_64 to
> > be set globally for users *and* we'd need libtool to recognise that it
> > needs to set LD_LIBRARY_PATH_64.
>
> > Unfortunately libtool doesn't do this automatically. So this is seems
> > to be a bug in the version of libtool we use. Another solution is to
> > set LD_LIBRARY_PATH_64 to include $LD_LIBRARY_PATH. This actually
> > works because the substitution is done live by the shell. In other
> > words, if LD_LIBRARY_PATH_64 is set to
> > /usr/local/gcc-4.4.1-sun-linker/lib/sparcv9:$LD_LIBRARY_PATH for all
> > users of t2 globally, I believe MPIR will work just fine on that
> > machine.
>
> > Bill.
>
> I do not believe it is correct to add the sparcv9 directory to 
> LD_LIBRARY_PATH,
> though I accept it might solve the issue. If anything, that would be added to
> LD_LIBRARY_PATH_64, but that is not working here.
>
> I would speak to the libtool developers - I know Ralf is very helpful, and has
> an account on 't2'. Perhaps he can solve this.
>
> Are you using the latest libtool ? If not, an upgrade might work.
>
> Dave

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