Shea Levy authored Nov 15, 2016 and Ben Gamari committed Nov 15, 2016

Some usages of symbols from sys/mman.h are guarded by
RTS_LINKER_USE_MMAP by C conditionals, not CPP conditionals. Since those
branches are dead anyway when !RTS_LINKER_USE_MMAP, we just stub out the
relevant symbols rather than increasing CPP branching.

Fixes #12839.

Reviewers: simonmar, austin, bgamari, erikd

Reviewed By: simonmar, bgamari, erikd

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2710

GHC Trac Issues: #12839