[Bug c/66425] New: (void) cast doesn't suppress __attribute__((warn_unused_result))

[rusty at rustcorp dot com.au]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66425

            Bug ID: 66425
           Summary: (void) cast doesn't suppress
                    __attribute__((warn_unused_result))
           Product: gcc
           Version: 4.9.2
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rusty at rustcorp dot com.au
  Target Milestone: ---

Yes, a repeat of 2005's https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25509

The world, especially glibc and the Linux kernel, have adopted __wur with a
passion, taking it well outside the "must" case (basically, realloc and nothing
else) into the "should" case.  For better or worse.

Thus I politely request that an explicit (void) cast work to disable this
warning.  Having projects create their own custom macros/templates to do this
is a worse outcome, and doesn't stop idiocy like ignoring realloc() anyway.

Please consider.
PS.  Happy to create a patch, if that would help.