[Bug ipa/89139] GCC emits code for static functions that aren't used by the optimized code

[m...@nieper-wisskirchen.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89139

--- Comment #6 from Marc Nieper-Wißkirchen <m...@nieper-wisskirchen.de> ---
Interestingly, the above code, slightly modified, exhibits another problem the
optimizer has:

void foo ();

static void c (void (*w) (void))
{
    w ();
}

static void f ()
{
    foo ();
}

static void *x = &f;

void g ()
{
    c (x);
}

The only difference consists in that f is not completely trivial but calls some
external function. In this case, the code of f is not inlined in g, and we get
the non-optimal code (in x86-64 assembly):

f:
        xorl    %eax, %eax
        jmp     foo
g:
        jmp     f

I'm not sure whether I should file in another bug for this example.