[Bug c/61739] __builtin_printf optimization conflicts with POSIX semantics

[bugdal at aerifal dot cx]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61739

Rich Felker <bugdal at aerifal dot cx> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |---

--- Comment #3 from Rich Felker <bugdal at aerifal dot cx> ---
Yes it does need to obtain ownership of the file: to set the orientation to
byte mode. This is required even by ISO C (without POSIX). A simpler test case:

printf("");
printf("%d\n", fwide(stdout));