Remove JL_GC_MARKSWEEP option

[yuyichao]

1. We don't really need it
2. It doesn't compile anymore and I don't think we should try to keep it

@vtjnash @carnaval

[StefanKarpinski]

+1

[JeffBezanson]

Yeah +1

[vtjnash]

We don't really need it

it helped me with porting julia to ppc, until I could figure out why the gc was corrupting memory on that platform

It doesn't compile anymore and I don't think we should try to keep it

but on the other hand, its generally not much work to patch back it back into a working state

[JeffBezanson]

until I could figure out why the gc was corrupting memory on that platform

What was needed for that, exactly? Would it have been enough just to disable collection?

[StefanKarpinski]

Can't you just turn off the GC with gc_enable(false) and achieve the same effect?

[vtjnash]

i think it may have been enough just turning on MEMDEBUG, but hindsight is 20/40 (since I don't actually remember all the specifics)

[StefanKarpinski]

So the question is whether there's anything this remains useful for that we don't have a better approach to, like turning off GC via gc_enable(false) or turning on MEMDEBUG.

[tkelman]

hindsight is 20/40 (since I don't actually remember all the specifics)

keep notes, man