[Bug c/90034] gcc hangs on wait4 after vfork after opening tmp file

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90034

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
wait4 is waiting for child process to finish.  You need to do strace with -f
option to follow the forks.