[Bug c/68039] New: Incorrect unused-result warning

[patrick at motec dot com.au]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68039

            Bug ID: 68039
           Summary: Incorrect unused-result warning
           Product: gcc
           Version: 5.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: patrick at motec dot com.au
  Target Milestone: ---

The following code generates an incorrect unused-result warning using gcc
5.2.0:

__attribute__((warn_unused_result)) int x()
{
        return 0;
}

int main()
{
        return x() ? 0 : 0;
}

> gcc test.c
test.c: In function ‘main’:
test.c:8:9: warning: ignoring return value of ‘x’, declared with attribute
warn_unused_result [-Wunused-result]
  return x() ? 0 : 0;