x86_64 unresolved target-symbol

[Hien Nguyen]

Stap failed to build the buildok/syscall.stp withthe following error
semantic error: unresolved target-symbol expression: identifier '$tvp' 
at /usr/local/share/systemtap/tapset/syscalls2.stp:935:18

where tvp is an argument of sys_select
asmlinkage long sys_select(int n, fd_set __user *inp, fd_set __user *outp,
                        fd_set __user *exp, struct timeval __user *tvp)

This only happens on x86_64. Looks like a bug (elfutils or gcc).

Hien.