Remove MAX_PATH restrictions from RTS, I/O manager and various utilities

Summary:
This shims out fopen and sopen so that they use modern APIs under the hood
along with namespaced paths.

This lifts the MAX_PATH restrictions from Haskell programs and makes the new
limit ~32k.

There are only some slight caveats that have been documented.

Some utilities have not been upgraded such as lndir, since all these things are
different cabal packages I have been forced to copy the source in different places
which is less than ideal. But it's the only way to keep sdist working.

Test Plan: ./validate

Reviewers: hvr, bgamari, erikd, simonmar

Reviewed By: bgamari

Subscribers: rwbarton, thomie, carter

GHC Trac Issues: #10822

Differential Revision: https://phabricator.haskell.org/D4416

1 files changed, 3 insertions, 0 deletions

diff --git a/rts/rts.cabal.in b/rts/rts.cabal.in
index 67fb9c5d92..0b9a8c4efd 100644
--- a/rts/rts.cabal.in
+++ b/rts/rts.cabal.in
@@ -129,6 +129,8 @@ library
                       rts/Timer.h
                       rts/Types.h
                       rts/Utils.h
+                      rts/fs.h
+                      rts/fs_rts.h
                       rts/prof/CCS.h
                       rts/prof/LDV.h
                       rts/storage/Block.h
@@ -429,6 +431,7 @@ library
                sm/Storage.c
                sm/Sweep.c
                xxhash.c
+               fs.c
                -- I wish we had wildcards..., this would be:
                -- *.c hooks/**/*.c sm/**/*.c eventlog/**/*.c linker/**/*.c
     if os(windows)