http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47032
Tobias Burnus <burnus at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |burnus at gcc dot gnu.org
--- Comment #12 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-02-12
15:04:48 UTC ---
(In reply to comment #11)
> While this is absolutely true, the major problem here is that gcc should not
> have switched to 128bit long double at all with AIX 6.1 (bug#46481).
Cf. http://gcc.gnu.org/ml/gcc/2011-02/msg00109.html
and http://gcc.gnu.org/ml/gcc/2011-02/msg00159.html
* * *
For the libgfortran side: Seems as if one should add a "#include
<math.h>"-based link test (cf. comment 8 and 10).
libgfortran currently only uses the functions if available (configure check).
The effect, if the are not, is the following:
(In reply to comment #0)
> ld: 0711-317 ERROR: Undefined symbol: .__copysignl128
> ld: 0711-317 ERROR: Undefined symbol: .__nextafterl128
Used by Fortran's NEAREST intrinsic (if available; no fall back if not) - thus,
it will fail if a user calls this function but should otherwise be OK.
> ld: 0711-317 ERROR: Undefined symbol: .__scalbnl128
Used for the intrinsics RRSPACING, SPACING and SET_EXPONENT.
> ld: 0711-317 ERROR: Undefined symbol: .__truncl128
Used for Fortran's ERFC_SCALED intrinsic.
> ld: 0711-317 ERROR: Undefined symbol: .__cabsl128
> ld: 0711-317 ERROR: Undefined symbol: .__cargl128
gfortran offers a replacement function in intrinsics/c99_functions.c, if
configure believes that those are not available.
I think most codes/users do not need either of NEAREST, ERFC_SCALED, RRSPACING,
SPACING and SET_EXPONENT. (I do not know whether other math functions are
effected, whose calls are directly generated via the front end.)
