bug#20272: Support reproducible builds

[Andy Wingo]

On Thu 04 Feb 2016 03:41, Mark H Weaver <address@hidden> writes:

>> Probably, ‘syntax-session-id’ would have to be a SRFI-39 parameter
>
> This might adversely affect the efficiency of our macro expander on
> platforms with slow thread local variables

I think you shouldn't worry about this.  The VM keeps a pointer to the
current thread, and accesses the dynamic state / dynamic stack from
there.  There are no pthread_getkey calls when accessing parameters in
the normal case.

Andy