------- Comment #4 from pinskia at gcc dot gnu dot org  2010-07-26 18:55 -------
Confirmed, this was working in 4.2.4:
t.c: In function ‘test’:
t.c:9: warning: ‘cs[0u].b’ is used uninitialized in this function
t.c:8: note: ‘cs[0u].b’ was declared here
t.c:13: warning: ‘cs[0u].a’ is used uninitialized in this function
t.c:8: note: ‘cs[0u].a’ was declared here
t.c:15: warning: ‘cs[0u].c’ is used uninitialized in this function
t.c:8: note: ‘cs[0u].c’ was declared here


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |diagnostic
      Known to fail|                            |4.3.2 4.6.0 4.5.0
      Known to work|                            |4.2.4
   Last reconfirmed|0000-00-00 00:00:00         |2010-07-26 18:55:56
               date|                            |
            Summary|strange warning text from   |[4.3/4.4/4.5/4.6 Regression]
                   |gcc                         |strange warning text from
                   |                            |gcc
   Target Milestone|---                         |4.3.6


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45083