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[Bug libfortran/78314] [aarch64] ieee_support_halting does not report unsupported fpu traps correctly


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78314

--- Comment #3 from nsz at gcc dot gnu.org ---
Author: nsz
Date: Wed Nov 16 17:27:04 2016
New Revision: 242505

URL: https://gcc.gnu.org/viewcvs?rev=242505&root=gcc&view=rev
Log:
[PR libgfortran/78314] Fix ieee_support_halting

ieee_support_halting only checked the availability of status
flags, not trapping support.  On some targets the later can
only be checked at runtime: feenableexcept reports if
enabling traps failed.

So check trapping support by enabling/disabling it.

Updated the test that enabled trapping to check if it is
supported.

gcc/testsuite/

        PR libgfortran/78314
        * gfortran.dg/ieee/ieee_6.f90: Use ieee_support_halting.

libgfortran/

        PR libgfortran/78314
        * config/fpu-glibc.h (support_fpu_trap): Use feenableexcept.


Modified:
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gfortran.dg/ieee/ieee_6.f90
    trunk/libgfortran/ChangeLog
    trunk/libgfortran/config/fpu-glibc.h

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