[Bug c++/87407] New: Enhance -Wunused-function to handle also inline functions

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87407

            Bug ID: 87407
           Summary: Enhance -Wunused-function to handle also inline
                    functions
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
            Blocks: 87403
  Target Milestone: ---

We properly warn about:

$ cat /tmp/unused.c 
static void foo()
{
}

$ gcc /tmp/unused.c -c -Wall
/tmp/unused.c:1:13: warning: ‘foo’ defined but not used [-Wunused-function]
 static void foo()
             ^~~

but not about:

$ cat /tmp/unused.c 
static inline void foo()
{
}

Clang does that:
$ clang /tmp/unused.c  -c -Wall
/tmp/unused.c:1:20: warning: unused function 'foo' [-Wunused-function]
static inline void foo()
                   ^
1 warning generated.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87403
[Bug 87403] Issues that suggest a new warning