Cannot use va_list, va_start, or va_end, when %ss != .data (-mno-callee-assume-ss-data-segment)

[tkchia]

$ cat test2.c
#include <stdarg.h>

void
baz (const char *fmt, ...)
{
  va_list ap;
  va_start (ap, fmt);
  while (va_arg(ap, int) != 0);
  va_end (ap);
}
$ ia16-elf-gcc -S -Os test2.c -mno-callee-assume-ss-data-segment 
In file included from test2.c:1:0:
test2.c: In function ‘baz’:
test2.c:7:13: error: passing argument 1 of ‘__builtin_va_start’ from pointer to non-enclosed address space
   va_start (ap, fmt);
             ^
test2.c:9:11: error: passing argument 1 of ‘__builtin_va_end’ from pointer to non-enclosed address space
   va_end (ap);
           ^

The issue was first surfaced by @asiekierka, at #102 (comment) .

[tkchia]

Starting a new Git branch tkchia/va-list to deal with this stuff...

[tkchia]

va_list + -no-callee-assume-ss-data-segment should work now, with the latest commits 5f8df20, 65e74b7, e4f7308, d43023a, and 9336aa4.

[asiekierka]

Can confirm. Thank you!