Re: identify unused functions?

[G Hasse <gorhas raditex se>]

On Sun, Mar 30, 2008 at 10:25:05PM +0300, Stefan Kost wrote:
> Hi,

Undefined and unused is not the same.

There is NO way to clerify all unused functions in a program.
You could call functions by their addresses and those addresses
could be calculated in runtime. So you don't know...

Something like this...
---<cut>---
int Funk1( void )
{
  printf("Funk1\n"); return(0);
}

int Funk2( void )
{
  printf("Funk2\n"); return(0);
}

main()
{

   int event = -1;
   int (* ptrFunk)( void );

   printf("Event 1 or 2: ");
   fgets( buffer, sizeof( buffer ), stdin );
   event = atoi(buffer);

   switch(event) {
   case 1:
     ptrFunk = Funk2;
     break;
   case 2:
     ptrFunk = Funk1;
     break;
   default:
     printf("No function called\n");
  }

    ptrFunk( );
}
---<cut>---

> nm --undefined-only *.o | cut -c12- | sort | uniq
> would give you a list of all external symbols
>
> nm --defined-only *.o | cut -c12- | sort | uniq
> would give you a list of all defined symbols
>
> now all enties in 2nd list, which are not in first list should be what you are 
> looking for ('comm' should be able to do that).
>
> Stefan
>
> Dr. Michael J. Chudobiak schrieb:
> > Is there any easy way to identify unused functions in source code, for 
> > cruft reduction?
> >
> > Using the -Wall flag identifies unused static functions, which is great, 
> > but it misses the non-static ones.
> >
> > - Mike
> >
> > _______________________________________________
> > gtk-app-devel-list mailing list
> > gtk-app-devel-list gnome org
> > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
>
> _______________________________________________
> gtk-app-devel-list mailing list
> gtk-app-devel-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list

-- 
Göran Hasse

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