[Bug ada/70867] [9/10/11/12 regression] access discriminant in return aggregate wrongly detected as dangling

[Bug ada/70867] [9/10/11/12 regression] access discriminant in return aggregate wrongly detected as dangling

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70867

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|8.5                         |9.4

--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8 branch is being closed.

[Bug ada/70867] [9/10/11/12 regression] access discriminant in return aggregate wrongly detected as dangling

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70867

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|9.4                         |9.5

--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 9.4 is being released, retargeting bugs to GCC 9.5.

[Bug ada/70867] [9/10/11/12 regression] access discriminant in return aggregate wrongly detected as dangling

[demoonlit at panathenaia dot halfmoon.jp]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70867

--- Comment #13 from yuta tomino <demoonlit at panathenaia dot halfmoon.jp> ---
Sorry, perhaps my example is illegal in Ada 2012.
"aliased" is required to return a reference of a part of the parameter.

Randy explained the change in
https://groups.google.com/g/comp.lang.ada/c/7dw7Oqi8lIk/m/5NUBhFN8DQAJ .
(I wonder if it was legal before Ada 2005?? Because aliased parameter is added
in Ada 2012 and the relevant text has been changed by AI05-0234-1.)

I think Nicolas's example is always legal.

Thanks.

[Bug ada/70867] [9/10/11/12 regression] access discriminant in return aggregate wrongly detected as dangling

[simon at pushface dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70867

simon at pushface dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |simon at pushface dot org

--- Comment #14 from simon at pushface dot org ---
(In reply to Nicolas Boulenguez from comment #0)
> Hello.
> With GCC-6 (Debian 6.0.1-2) 6.0.1 20160423 (prerelease),
> compiling the following package with "gcc-6 -c p.adb" fails:
> p.adb:4:20: access discriminant in return aggregate would be a dangling
> reference
> The code compiles
> - if the "generic" line is removed
> - or if ".all" is inserted between "Position" and ".Item'Access"
> I am not sure whether returning this reference is allowed by the Ada
> Reference Manual,
> but the semantics of "generic" and ".all" should certainly not affect the
> answer.

GCC 11.1.0, x86_64-apple-darwin on macOS 11.6 (Big Sur):

This compiles without error, and the example below executes correctly.

with P;
with Ada.Text_IO;
procedure P_Test is
   package Q is new P;
   R : aliased Q.R := (Item => 42);
   T : Q.T := Q.F (R'Access);
begin
   Ada.Text_IO.Put_Line (T.D.all'Image);
end P_Test;

[Bug ada/70867] [9/10/11/12 regression] access discriminant in return aggregate wrongly detected as dangling

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70867

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|9.5                         |11.0

--- Comment #15 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
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