Hi Joost,
Why do you want -fno-math-errno to be the default for gfortran?
AFAICT such default is not documented and the flag works
(checked on your test gfortran.dg/errnocheck_1.f90).
For -fassociative-math, the manual says
For Fortran the option is automatically enabled when both -fno-signed-zeros and
-fno-trapping-math are in effect.
and again AFAICT this is not working (checked on your test
gfortran.dg/associative_1.f90) while I see
/* Fortran allows associative math - but we cannot reassociate if
we want traps or signed zeros. Cf. also flag_protect_parens. */
if (flag_associative_math == -1)
flag_associative_math = (!flag_trapping_math && !flag_signed_zeros);
in gcc/fortran/options.c. Why this is not working is beyond my understanding,
but I am not sure that your fix is the right one.
Cheers,
Dominique
