check_qualified_type

[Richard Biener]

On Mon, 17 Jun 2024, Martin Uecker wrote:

> Am Montag, dem 17.06.2024 um 08:01 +0200 schrieb Richard Biener via Gcc:
> > On Sun, 16 Jun 2024, Martin Uecker wrote:
> > 
> > > 
> > > 
> > > I am trying to understand what check_qualified_type
> > > does exactly. The direct comparison of TYPE_NAMES seems incorrect
> > > for C and its use is c_update_type_canonical then causes
> > > PR114930 and PR115502.  In the later function I think
> > > it is not really needed and I guess one could simply remove
> > > it, but I wonder if it works incorrectly in other cases 
> > > too?
> > 
> > TYPE_NAMES is compared because IIRC typedefs are recorded as variants
> > and 'const T' isn't the same as 'const int' with typedef int T.
> 
> so if it is intentional that it differentiates between 
> 
> struct foo
> 
> and
> 
> typedef struct foo bar
> 
> then I will change c_update_type_canonical to not use it,
> because both types should have the same TYPE_CANONICAL

The check is supposed to differentiate between variants and all variants
have the same TYPE_CANONICAL so I'm not sure why you considered using
this function for canonical type compute?

Richard.