https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96749
Iain Sandoe <iains at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |iains at gcc dot gnu.org
--- Comment #4 from Iain Sandoe <iains at gcc dot gnu.org> ---
Created attachment 50377
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50377&action=edit
Patch under test
thanks for the reports.
Even though user code cannot, the compiler can generate things like:
(make some temporary, use that temporary)
So a compound statement that builds a temporary that we then use in the second
part.
When this idiom was encountered, the transforms applied to split await
expressions out were producing something like
{
build temporary
temporary
use the temporary
}
so the middle statement was harmless, but also has no effect (hence the
warning).
the patch under test accounts for this idiom.
