GCC 12. with the -gnat2022 switch, supports (a large part of) ARM
2022. One of the changes is AI12-0212[1], the use of square brackets
[] in array aggregates.
I was surprised to find that the compiler reports the use of
parentheses () for array aggregates as obsolescent! To quote PR104751[2],
=============
Compiling
procedure New_Syntax is
T : array (1 .. 5) of Integer;
begin
T := (1, 2, 3, 4, 5);
end New_Syntax;
with -gnat2022 -gnatwj gives
new_syntax.adb:4:09: warning: array aggregate using () is an obsolescent
syntax, use [] instead [-gnatwj]
but use of parens is not in Annex J; use of brackets is an option,
AARM 202x Draft 32, 4.3.3(49.m).
Having -gnatwj as part of -gnatwa makes this very intrusive.
=============
The fact that it happens with -gnatwa, which is a switch that I
suspect quite a lot of us use, will be particularly annoying for those
who use -gnatwe (treat warnings as errors) and who want to support
multiple compiler releases (for example, the Ada Drivers Library).
The response dismissing the PR suggested using
pragma Warnings (Off, "*array aggregate*");
and one glimmer of hope is that this can be used as a configuration
pragma.
I could remove the problem from macOS releases that I support (sem_aggr.adb:1803..1815), but of course that would lead users into
problems when using another GCC 12+ release.
[1]
http://www.ada-auth.org/cgi-bin/cvsweb.cgi/ai12s/ai12-0212-1.txt?rev=1.29&raw=N
[2]
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104751
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