ghcjs: replace integer-simple with integer-gmp

GHCJS uses integer-gmp, but cabal2nix generates a dependency list that
includes integer-simple instead. This tweaks the stage2 generator to
replace any instance of integer-simple with integer-gmp.

Things currently still work without this change (assuming
integer-simple is defined as null), as ghcjs includes integer-gmp in
its stage1 packages - so it's always available.

However, this change makes things a bit more explicit, rather than
leaving things to chance. If at any point the stage1 packages are also
split up into separate derivations, the integer-gmp package will need to
be passed along to the packages that depend on it. This change should
prevent some confusion going forward.

1 files changed, 5 insertions, 1 deletions

diff --git a/pkgs/development/haskell-modules/configuration-ghcjs.nix b/pkgs/development/haskell-modules/configuration-ghcjs.nix
index 53da845210e..ac7a30d4cfb 100644
--- a/pkgs/development/haskell-modules/configuration-ghcjs.nix
+++ b/pkgs/development/haskell-modules/configuration-ghcjs.nix
@@ -49,7 +49,11 @@ self: super:
   time = null;
   transformers = null;
   unix = null;
-  integer-simple = null;
+
+  # Don't set integer-simple to null!
+  # GHCJS uses integer-gmp, so any package expression that depends on
+  # integer-simple is wrong.
+  #integer-simple = null;
 
   # These packages are core libraries in GHC 7.10.x, but not here.
   bin-package-db = null;