cabal sdist refuses to build with -O1

Sigh, disabled the full fix. What we have now will work once the ghc bug
is fixed, but not currently.

CHANGELOG

@@ -45,6 +45,7 @@ git-annex (6.20180316) upstream; urgency=medium
   * Include amount of data transferred in progress display.
   * Dial back optimisation when building on arm, which prevents
     ghc and llc from running out of memory when optimising some files.
+    (Unfortunately this fix is incomplete due to a ghc bug.)
 
  -- Joey Hess <id@joeyh.name>  Fri, 16 Mar 2018 12:10:40 -0400
 

git-annex.cabal

@@ -379,8 +379,11 @@ Executable git-annex
   if flag(Production)
     -- Lower memory systems can run out of memory with -O2, so
     -- optimise slightly less.
+    -- This needs -O1 before the -optlo, due to this bug:
+    -- https://ghc.haskell.org/trac/ghc/ticket/14821
+    -- But unfortunately, hackage currently refuses to accept -O1
     if arch(arm)
-      GHC-Options: -O1 -optlo-O2
+      GHC-Options: -optlo-O2
     else
       GHC-Options: -O2