* Aggregate with (parens) considered obsolescent
@ 2022-04-11 16:15 Simon Wright
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From: Simon Wright @ 2022-04-11 16:15 UTC (permalink / raw)
GCC 12. with the -gnat2022 switch, supports (a large part of) ARM
2022. One of the changes is AI12-0212, 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,
procedure New_Syntax is
T : array (1 .. 5) of Integer;
T := (1, 2, 3, 4, 5);
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
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.
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