https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84833
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #5)
> (In reply to Jakub Jelinek from comment #2)
> > Just a note, as can be seen e.g. on
> > static volatile int a;
> > static int my_foo1 (void) { return 1; }
> > static int my_foo2 (void) { return 2; }
> > typedef int (*F) (void);
> > static F resolve_foo (void) { if (a) return my_foo1; else return my_foo2; }
> > static int foo (void) __attribute__ ((ifunc ("resolve_foo")));
> >
> > int
> > main ()
> > {
> > if (foo () != 2)
> > __builtin_abort ();
> > }
> > there is no reason why any of the target clones, resolver or the ifunc
> > function should be .globl, they can all be local to the TU, IFUNC work just
> > fine that way too. So, if the function with target_clones attribute is not
> > TREE_PUBLIC, neither should be any of the multiple_targets.c created
> > symbols.
>
> If I see correctly, we do not make these global:
>
> nm pr84833-2.o
> 0000000000000000 b a
> U abort
> 000000000000000c i foo
> 0000000000000022 T main
> 0000000000000000 t my_foo1
> 0000000000000006 t my_foo2
> 000000000000000c t resolve_foo
>
> Note that it was subject of PR81213.
nm is not really usable to determine if an IFUNC symbol is global or local, i
is printed regardless if it is global or local.
$ nm pr84833 | grep foo; readelf -Ws pr84833 | grep foo
0000000000400560 i foo
0000000000400540 t my_foo1
0000000000400550 t my_foo2
0000000000400560 t resolve_foo
27: 0000000000400540 6 FUNC LOCAL DEFAULT 13 my_foo1
28: 0000000000400550 6 FUNC LOCAL DEFAULT 13 my_foo2
29: 0000000000400560 23 FUNC LOCAL DEFAULT 13 resolve_foo
31: 0000000000400560 23 IFUNC LOCAL DEFAULT 13 foo
$ nm pr84833-2 | grep foo; readelf -Ws pr84833-2 | grep foo
0000000000400560 i foo
0000000000400540 t my_foo1
0000000000400550 t my_foo2
0000000000400560 t resolve_foo
27: 0000000000400540 6 FUNC LOCAL DEFAULT 13 my_foo1
28: 0000000000400550 6 FUNC LOCAL DEFAULT 13 my_foo2
29: 0000000000400560 23 FUNC LOCAL DEFAULT 13 resolve_foo
59: 0000000000400560 23 IFUNC GLOBAL DEFAULT 13 foo
Where pr84833.c is the above #c2 testcase and pr84833-2.c is that without
static keyword on foo.
These testcases are compiled fine, what I was trying to make sure is that if
the target_clones function is static, it is not exported outside of the TU.
