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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug modula2/108551] gcc/m2/gm2-libs-pim/Termbase.mod:128:1: error:
 control reaches end of non-void function [-Werror=return-type]
Date: Thu, 26 Jan 2023 12:54:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108551

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Martin Li=C5=A1ka from comment #3)
> I might reduced that:
>=20
> $ cat Termbase.mod
> IMPLEMENTATION MODULE Termbase ;
> TYPE
>    ReadMethods =3D POINTER TO RECORD
>                                s   : StatusProcedure ;
>                             END ;
>    WriteMethod =3D POINTER TO RECORD
>                             END ;
> VAR
>    rStack: ReadMethods ;
>    wStack: WriteMethod ;
> PROCEDURE AssignRead (rp: ReadProcedure; sp: StatusProcedure;
>                       VAR Done: BOOLEAN) ;
> BEGIN
>    IF rStack=3DNIL
>    THEN
>    END
> END AssignRead ;
> (*
> *)
> PROCEDURE UnAssignRead (VAR Done: BOOLEAN) ;
> END UnAssignRead ;
> PROCEDURE Read (VAR ch: CHAR) ;
> END Read ;
> PROCEDURE KeyPressed () : BOOLEAN ;
> BEGIN
>    IF rStack=3DNIL
>    THEN
>       RETURN( rStack^.s() )
>     ELSE
>       RETURN( rStack^.s() )
>    END
> END KeyPressed ;
> PROCEDURE AssignWrite (wp: WriteProcedure; VAR Done: BOOLEAN) ;
> BEGIN
>    IF wStack=3DNIL
>    THEN=20=20=20
>    END
> END AssignWrite ;
> PROCEDURE UnAssignWrite (VAR Done: BOOLEAN) ;
> END UnAssignWrite ;
> PROCEDURE Write (VAR ch: CHAR) ;
> END Write ;
> END Termbase.
>=20
> $ /dev/shm/objdir/./gcc/gm2 -B/dev/shm/objdir/./gcc/ Termbase.mod
> -Werror=3Dreturn-type -I/home/marxin/Programming/gcc/gcc/m2/gm2-libs-pim
> -I/home/marxin/Programming/gcc/gcc/m2/gm2-libs
> Termbase.mod: In function =E2=80=98main=E2=80=99:

^^^

that's again for 'main', like my attempt at a reduced testcase.  I think
the proper fix is to give up on fixing this diagnostic and instead ignore
-Wreturn-type as intended.=