0.65 HPUX/AIX update

[Thomas Vogels]

Kurt,

  thanks for the changes.  I've downloaded the snapshot on July 22.
It looks like we are in good shape now for AIX:

"Kurt" == Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at> writes:

Kurt> The current situation is as follows.
Kurt> 
Kurt> AIX:
Kurt> 
Kurt> * I still need f77 for linking.  Using ld with the suggested flags gives
Kurt> a binary with `exec format error'.  The problem seems to be with an
Kurt> unreferenced __start.

I apologize for not seeing this earlier: "__start" is defined in
/lib/crt0.o.  So all you have to do is add /lib/crt0.o to the objects
when linking.  (You have to look carefully for that in the output from
gcc --verbose anything.o to learn what gcc is doing when linking an executable.)

Kurt> * The floating point (finite|isnan) stuff is strange, but under control,
Kurt> I think.  Plain cc works, gcc has a problem and seems to need having
Kurt> prototypes turned off for IEEE fp.  (More below.)

Quick fix and insanity check:  Add the following lines at the end of Arith.h
  #include <fp.h>
  static int finite (double x) {
        return FINITE (x);
  }
This will generate lots of warnings.  The resulting executable
(compiled with gcc) works wrt Inf and NaN!  My current assumption is
that there is a bug in gcc that generates the wrong inline version of
finite.  Overwriting it solves the problem.  A better fix would be to
ensure that finite is never called when configure finds that it is
buggy.  (I believe that the issue whether finite () exists is a
separate one.  So there should be two flags, like HAVE_FINITE and
HAVE_FINITE_THAT_STINKS... )

Kurt> So there is a problem in the finite() test with gcc.  It somehow is
Kurt> related to the use of ANSI C prototypes, and disappears if we define
Kurt> _NO_PROTO.  I am in the process of adding this as a short term fix, but
Kurt> we should think a bit more about that.

  -tom

--
mailto:tov@ece.cmu.edu (Tom Vogels)   Tel: (412) 268-6638   FAX: -3204

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