[Bug c/23087] Misleading warning, "... differ in signedness"

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=23087

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mpolacek at gcc dot gnu.org

--- Comment #14 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I think I might have a fix, but there's this thing about e.g.

void
foo (void)
{
  char *p = "";
  signed char *ps = "";
  unsigned char *pu = "";
}

with this issue fixed, we'd warn like this
$ xgcc z.c -c
z.c: In function ‘foo’:
z.c:5:21: warning: initialization from incompatible pointer type
[-Wincompatible-pointer-types]
   signed char *ps = "";
                     ^~

z.c:6:23: warning: initialization from incompatible pointer type
[-Wincompatible-pointer-types]
   unsigned char *pu = "";
                       ^~
whereas older gcc would be silent on that.  I.e., -Wincompatible-pointer-types
is a warning that is enabled by default, but -Wpointer-sign is enabled by
-Wpedantic || -Wall.  I.e., we'd be more verbose.  Maybe this is a non-issue as
most of the people are using -Wall anyway.

In any case I agree that the message about signedness is wrong.