[Bug lto/90229] Interaction among -Wl,--as-needed and LTO results in an undefined symbol

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90229

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
$ cat 1.ii
extern int FLAGS_verbose;
extern "C" void pthread_create();

void a(const char *b...) {
  if (FLAGS_verbose) {
    __builtin_va_list ap;
    __builtin_va_start(ap, b);
  }
}
void a() { pthread_create(); }
int main() { a(""); return 0; }