[Bug c/63626] New: Warning "inline function declared but never defined" output twice

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63626

            Bug ID: 63626
           Summary: Warning "inline function declared but never defined"
                    output twice
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org

On this TU:

inline int foo (void);

we warn twice:
ff.c:1:12: warning: inline function ‘foo’ declared but never defined
 inline int foo (void);
            ^
ff.c:1:12: warning: inline function ‘foo’ declared but never defined