From 34b8afa4b2e21be2e1f91ce2ecdc65ab971547ac Mon Sep 17 00:00:00 2001
From: "Edward Z. Yang" <ezyang@cs.stanford.edu>
Date: Thu, 6 Oct 2016 23:16:33 -0700
Subject: [PATCH] Version test for Backpack support.
Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>
---
Cabal/Distribution/Simple/Compiler.hs | 5 +++++
Cabal/Distribution/Simple/Configure.hs | 9 +++++++--
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/Cabal/Distribution/Simple/Compiler.hs b/Cabal/Distribution/Simple/Compiler.hs
index 505f9cb1bb..02d0c9f7d7 100644
--- a/Cabal/Distribution/Simple/Compiler.hs
+++ b/Cabal/Distribution/Simple/Compiler.hs
@@ -59,6 +59,7 @@ module Distribution.Simple.Compiler (
unitIdSupported,
coverageSupported,
profilingSupported,
+ backpackSupported,
-- * Support for profiling detail levels
ProfDetailLevel(..),
@@ -316,6 +317,10 @@ packageKeySupported = ghcSupported "Uses package keys"
unitIdSupported :: Compiler -> Bool
unitIdSupported = ghcSupported "Uses unit IDs"
+-- | Does this compiler support Backpack?
+backpackSupported :: Compiler -> Bool
+backpackSupported = ghcSupported "Support Backpack"
+
-- | Does this compiler support Haskell program coverage?
coverageSupported :: Compiler -> Bool
coverageSupported comp =
diff --git a/Cabal/Distribution/Simple/Configure.hs b/Cabal/Distribution/Simple/Configure.hs
index 4c6ffb2a97..656ac110cf 100644
--- a/Cabal/Distribution/Simple/Configure.hs
+++ b/Cabal/Distribution/Simple/Configure.hs
@@ -954,13 +954,18 @@ checkCompilerProblems comp pkg_descr enabled = do
all (all (isDefaultIncludeRenaming . snd) . backpackIncludes)
(enabledBuildInfos pkg_descr enabled)) $
die $ "Your compiler does not support thinning and renaming on "
- ++ "package flags. To use this feature you probably must use "
+ ++ "package flags. To use this feature you must use "
++ "GHC 7.9 or later."
when (any (not.null.PD.reexportedModules) (PD.allLibraries pkg_descr)
&& not (reexportedModulesSupported comp)) $ do
die $ "Your compiler does not support module re-exports. To use "
- ++ "this feature you probably must use GHC 7.9 or later."
+ ++ "this feature you must use GHC 7.9 or later."
+
+ when (any (not.null.PD.signatures) (PD.allLibraries pkg_descr)
+ && not (backpackSupported comp)) $ do
+ die $ "Your compiler does not support Backpack. To use "
+ ++ "this feature you must use GHC 8.1 or later."
-- | Select dependencies for the package.
configureDependencies
--
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