https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84184
--- Comment #10 from Sergei Trofimovich <slyfox at inbox dot ru> ---
Oh, I have forgot to ask another question:
In attached reloc-bug.c there is seemingly two functionally identical samples:
extern char glo_u64_middle_hidden[] __attribute__((visibility("hidden")));
static u64 __attribute__((noinline)) val_u64_hidden(void) {
const u64 * m = (const u64 *)glo_u64_middle_hidden;
return m[-1];
}
and
extern char glo_s_middle_hidden[] __attribute__((visibility("hidden")));
struct s { u64 a; };
static u64 __attribute__((noinline)) val_s_hidden(void) {
const struct s * m = (const struct s *)glo_s_middle_hidden;
return m[-1].a;
}
Why those are handled differently? First looks like it works, second does not.
It was my main signal to file a bug against gcc as asymmetry looked fishy.
$ ./reloc-bug
val/global = 100
val/hidden = 100
Segmentation fault
