[J3] Upcoming gfortran 15 will contain an implementation of unsigned numbers

[Thomas König]

Hello,

you may be interested to know that the upcoming release of Gfortran 15
(due in early 2025) will include an experimental implementation of
24-116.txt, the unsigned number proposal. This is already part of the
current development version, and is selected via the -funsigned option.
The only major part missing at the moment is ISO_Fortran_binding.h .

Some preliminary documentation can be found at
https://gcc.gnu.org/onlinedocs/gfortran/Unsigned-integers.html ,
this will be extended before the release.

Test cases, which can also serve as example use cases, can be found at
https://gcc.gnu.org/git/?p=gcc.git;a=tree;f=gcc/testsuite/gfortran.dg
(any file with "unsigned" in the name).

Anybody who feels like compiling the current gcc development version can
try this out already. Bug reports and comments welcome!

Best regards

	Thomas