[Patch, fortran, 4.9] Use bool type instead gfc_try

[Miles Bader]

"N.M. Maclaren" <nmm1@cam.ac.uk> writes:
> That is another matter entirely.  The code of gcc/gfortran is supposed
> to be compilable with other compilers, and it is foolish to make
> unnecessary assumptions by relying on undefined behaviour.
>
> The simple facts are that C++ does NOT define bool to be compatible with
> _Bool, and there are enough differences in specification and semantics
> to make it likely that they are not the same in at least some compilers.
> This mess has caused and still causes no end of problems for Fortran
> interoperability and in standards like MPI.

Er, maybe so, but is there actually an issue in _this_ case?

>From original message, it sounds like these are internal compiler
interfaces, so all that matters is that they be self-consistent, and
there's no external ABI involved... So as long as all the code in
question is compiled with C++ and uses C++ bool, or is compiled with
C99 and uses _Bool, and doesn't use any functionality that isn't in
the intersection of those two types, there shouldn't be any problem,
right?

-miles

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