Re: Undefined identifiers for alphaev6-dec-osf4.0e

[Brian Gough <bjg at network-theory dot co dot uk>]

This should now be fixed in CVS. Let me know if there are any problems
with it as I was not able to test it directly myself. Thanks.

Tim Mooney writes:
 > In regard to: Re: Undefined identifiers for alphaev6-dec-osf4.0e, PETER...:
 > 
 > >at least on Digital Unix 4.0c, there is no such macro in
 > >/usr/include/machines/fpu.h. There are 5 similar macros (IEEE_TRAP_ENABLE_INV,
 > >IEEE_TRAP_ENABLE_DZE, IEEE_TRAP_ENABLE_OVF, IEEE_TRAP_ENABLE_UNF,
 > >IEEE_TRAP_ENABLE_INE, IEEE_TRAP_ENABLE_MASK), but IEEE_TRAP_ENABLE_DNO. Could
 > >this be a difference between DU 4.0c and the later versions?
 > 
 > Peter-
 > 
 > You're right.  4.0D doesn't have it either.  There's also no mention of
 > denormalized operands in the man page for ieee_set_fp_control.  This means
 > that the capability apparently doesn't even exist in 4.0D and earlier.  4.0f
 > and later does have it -- 4.0e might -- I don't know as I don't have access
 > to a 4.0e system anywhere.  I don't see the change mentioned in the 4.0f
 > release notes, so I have to assume the change was made at 4.0e.
 > 
 > This means that fp-tru64.c won't compile on 4.0d and earlier.  It could be
 > made to compile (without support for GSL_IEEE_MASK_DENORMALIZED) on 4.0d
 > and earlier if we had a 
 > 
 > #if !defined(HAVE_IEEE_TRAP_ENABLE_DNO)
 > /* At 4.0d and earlier it was still called Digital Unix, so use that name in
 >  * the error.
 >  */
 > GSL_ERROR ("Sorry, this version of Digital Unix does not support denormalized operands.", GSL_EUNSUP) ;
 > #else
 > 	/* use the code already in place, if IEEE_TRAP_ENABLE_DNO is available */
 > 
 > #endif
 > 
 > 
 > 
 > The simple/lame way to define the HAVE_IEEE_TRAP_ENABLE_DNO symbol (or
 > something shorter, suggestions welcome) would be to do so for all versions
 > of Tru64 of 4.0e and higher.  That could be done with a
 > 
 > 	case "$host_os" in
 > 
 > 		...
 > 
 > 	esac
 > 
 > construct.
 > 
 > The better fix would be to AC_TRY_COMPILE a test program that tries to use
 > the IEEE_TRAP_ENABLE_DNO define.
 > 
 > Unless someone else is anxious to tackle this, I'll add a test to detect
 > this problem and submit a patch.  I'll be gone for more than a week starting
 > this coming weekend, so if I don't get it done before Saturday (not likely,
 > at this point) it may be 2 or 3 weeks before I get to it.
 > 
 > Tim
 > -- 
 > Tim Mooney                              mooney@dogbert.cc.ndsu.NoDak.edu
 > Information Technology Services         (701) 231-1076 (Voice)
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 > North Dakota State University, Fargo, ND 58105-5164
 > 
 >