Difference between revisions of "Upgrading packages"

Revision as of 23:44, 23 October 2016

A list of things that need updating when porting packages to newer library/cabal versions.

If you maintain a Haskell package this is for you. For older versions of this document:

This page only tracks updates through 7.0 and earlier.

Updating to GHC 7.0

When upgrading to GHC 7.0, any of your packages that worked against the base-3 library will need to be updated to the base-4.

Compatibility with older GHC

Use cabal's conditional thingy, checking on impl(ghc >= x.yz). E.g:

   ghc-options:         -Wall -fexcess-precision -funbox-strict-fields
   if impl(ghc >= 6.12)
       ghc-options:     -fno-warn-unused-do-bind

@@ Line 6: / Line 6: @@
 * [[/Updating to GHC 6.10]]
 * [[/Updating to GHC 6.8]]
+* [[/Updating to GHC 7.6]]
+Most new tips for fixing build failures are tracked at https://github.com/haskell-infra/hackage-trustees/blob/master/cookbook.md
+This page only tracks updates through 7.0 and earlier.
 '''Updating to GHC 7.0'''
@@ Line 13: / Line 17: @@
 the base-3 library will need to be updated to the base-4.
-'''Wanted - catering to GHC versions'''
+'''Compatibility with older GHC'''
+Use cabal's conditional thingy, checking on impl(ghc >= x.yz).  E.g:
-How do I configure Cabal to use different GHC options depending on GHC version?
-E.g. using -fno-warn-unused-bind is convenient for certain GHC versions, but breaks compatibility with older ones.
+    ghc-options:         -Wall -fexcess-precision -funbox-strict-fields
-(This is a stub, since the previous version was so out-of-date. Please help by adding useful content.)
+    if impl(ghc >= 6.12)
+        ghc-options:     -fno-warn-unused-do-bind