[Bug libgomp/50386] [4.7 Regression] libgomp.h:87:5: error: unnamed struct/union that defines no instances

["dave.anglin at bell dot net" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50386

--- Comment #5 from dave.anglin at bell dot net 2011-09-23 16:04:18 UTC ---
On 9/20/2011 6:32 PM, ramana at gcc dot gnu.org wrote:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50386
>
> --- Comment #4 from Ramana Radhakrishnan<ramana at gcc dot gnu.org>  2011-09-20 22:32:49 UTC ---
> I think this is a bootstrap issue rather than a problem with libgomp . A
> reduced testcase of this form fails with the stage2 compiler but is ok with the
> stage1 compiler.
>
>
> struct gomp_work_share
> {
>    /* This member records the SCHEDULE clause to be used for this construct.
>       The user specification of "runtime" will already have been resolved.
>       If this is a SECTIONS construct, this value will always be DYNAMIC.  */
>    union {
>      struct {
>        /* This is the chunk_size argument to the SCHEDULE clause.  */
>        long chunk_size;
>
>        /* This is the iteration end point.  If this is a SECTIONS construct,
>           this is the number of contained sections.  */
>        long end;
>
>        /* This is the iteration step.  If this is a SECTIONS construct, this
>           is always 1.  */
>        long incr;
>      }u;
>
>    };
> }a;
>
> Where the stage2 compiler goes :
>
> /home/40000/t1.i:21:3: warning: unnamed struct/union that defines no instances
> [enabled by default]
>
>
> and the stage1 compiler goes quietly.
>
> Could you check if you see similar behaviour ?
>
Yes, exactly.  I noted in my original report that the error occurred in 
stage2.

While not fully confirmed, it looks like this was introduced by r178692.

Dave