Avoid setting LOCPATH in linux standalone builds now that ghc has been fixed to not hang when it cannot find locale files.

Build/LinuxMkLibs.hs

@@ -5,6 +5,8 @@
  - Licensed under the GNU GPL version 3 or higher.
  -}
 
+{-# LANGUAGE CPP #-}
+
 module Main where
 
 import System.Environment
@@ -72,6 +74,11 @@ installLinkerShim top linker exe = do
 		[ "#!/bin/sh"
 		, "GIT_ANNEX_PROGRAMPATH=\"$0\""
 		, "export GIT_ANNEX_PROGRAMPATH"
+#if ! MIN_VERSION_GLASGOW_HASKELL(7,10,0,0)
+		-- workaround for https://ghc.haskell.org/trac/ghc/ticket/7695
+		, "LOCPATH=/dev/null"
+		, "export LOCPATH"
+#endif
 		, "exec \"$GIT_ANNEX_DIR/" ++ exelink ++ "\" --library-path \"$GIT_ANNEX_LD_LIBRARY_PATH\" \"$GIT_ANNEX_DIR/shimmed/" ++ base ++ "/" ++ base ++ "\" \"$@\""
 		]
 	modifyFileMode exe $ addModes executeModes

debian/changelog

@@ -2,6 +2,8 @@ git-annex (6.20160419) UNRELEASED; urgency=medium
 
   * Fix duplicate progress meter display when downloading from a git remote
     over http with -J.
+  * Avoid setting LOCPATH in linux standalone builds now that ghc has been
+    fixed to not hang when it cannot find locale files.
 
  -- Joey Hess <id@joeyh.name>  Tue, 19 Apr 2016 12:57:15 -0400
 

doc/bugs/cannot_change_locale___40__en__95__US.UTF-8__41__.mdwn

@@ -26,3 +26,22 @@ he_IL
 he_IL.iso88598
 he_IL.utf8
 POSIX
+
+> I've made LOCPATH not be set except when git-annex is built with ghc
+> older than 7.10, since the problem was fixed in ghc 7.10.
+> 
+> Also, I loved the LOCPATH setting into the linker shim script, rather
+> than in runshell, so it will only affect the programs bundled with
+> git-annex (itself and git and a few other things). Which are not
+> localized anyway in the bundle. So, even in builds where it's still set
+> (the linux ancient build in particular), things done in the runshell
+> environment won't be affected.
+> 
+> I do wonder if there could be problems with incompatabilities between the
+> bundled glibc and the system locale files, which might be for a
+> newer/older libc version. Not so much random `.mo` files, which seem
+> quite portable across glibc versions, but the more core locale files.
+> If that turns out to be a problem, LOCPATH might have to be turned back
+> on. 
+> 
+> For now, [[done]] --[[Joey]]

standalone/linux/skel/runshell

@@ -100,10 +100,6 @@ export ORIG_GCONV_PATH
 GCONV_PATH="$base/$(cat "$base/gconvdir")"
 export GCONV_PATH
 
-# workaround for https://ghc.haskell.org/trac/ghc/ticket/7695
-LOCPATH=/dev/null
-export LOCPATH
-
 ORIG_GIT_EXEC_PATH="$GIT_EXEC_PATH"
 export ORIG_GIT_EXEC_PATH
 GIT_EXEC_PATH="$base/git-core"