[Bug fortran/50273] [4.5/4.6/4.7 Regression] -Walign-commons no longer effective

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50273

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011-09-02
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-09-02 
10:11:32 UTC ---
> ./f951 -quiet t.f90 -Wpadded
f951: warning: padding struct size to alignment boundary [-Wpadded]
f951: warning: padding struct to align 'pending' [-Wpadded]
f951: warning: padding struct size to alignment boundary [-Wpadded]
t.f90: In function 'test':
t.f90:1:0: warning: padding struct size to alignment boundary [-Wpadded]

Note that suggesting -fno-align-commons shouldn't be done - using it
can severely reduce performance.

Not sure where the first three warnings come from - probably from frontend
generated entities which are not detected as "builtin"

      if (DECL_SOURCE_LOCATION (field) != BUILTINS_LOCATION)
        warning (OPT_Wpadded, "padding struct to align %q+D", field);

  if (TREE_CONSTANT (unpadded_size)
      && simple_cst_equal (unpadded_size, TYPE_SIZE (rli->t)) == 0
      && input_location != BUILTINS_LOCATION)
    warning (OPT_Wpadded, "padding struct size to alignment boundary");