Turn on SplitSections by default

This is a general tracking bug for what is blocking us from turning on SplitSections by default, implemented in #8405 (closed). Fixing this, and mandating use of the gold linker, will help solve #11285 (closed) (split objects make linking slow), and will make ghc-split unnecessary, mooting #9832 (closed).

I encountered some misinformation while talking to people about this feature, regarding whether or not this feature only supported by Apple-style linkers (i.e. on Mac OS X)? On IRC I heard a claim made that --split-sections was only supported by Mac OS X. However, olsner pointed out that -split-sections on GHC was OUR reimplementation of the feature, and likely does not work on Mac OS X. https://github.com/snowleopard/shaking-up-ghc/issues/153#issuecomment-171078800 A later comment mentioned that

So, can we turn on this feature by default? Does it subsume split-objs? Does it work on all the tier-1 platforms? It would be nice if bgamari, olsner and co could weigh in here. Thanks!

Trac metadata

Trac field	Value
Version	8.0.1-rc1
Type	Task
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Build System
Test case
Differential revisions
BlockedBy
Related
Blocking	#11285 (closed)
CC	bgamari, olsner
Operating system
Architecture

changed milestone to %8.2.1

changed weight to 5

added Ttask Trac import labels

closed

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedDuplicate

Trac metadata

Trac field	Value
Blocking	#11285 (closed) →

The new Hadrian build system has been merged. Relabeling the tickets concerning the legacy make build system to prevent confusion.

Trac metadata

Trac field	Value
Component	Build System → Build System (make)

added Pnormal label