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.
From-SVN: r242505
0af3095468