From 6b847c923ec62d18e99a30858efc3506cee32dca Mon Sep 17 00:00:00 2001
From: Daniel Gröber <dxld@darkboxed.org>
Date: Tue, 30 Jul 2019 16:37:01 +0200
Subject: ghc-session: Add GHC version match check

---
 tests/GhcSession.hs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tests/GhcSession.hs b/tests/GhcSession.hs
index 22b94b4..6816e02 100644
--- a/tests/GhcSession.hs
+++ b/tests/GhcSession.hs
@@ -9,6 +9,7 @@
 module Main where
 
 import GHC
+import Config
 import GHC.Paths (libdir)
 import Outputable
 import DynFlags
@@ -111,10 +112,14 @@ main = do
   putStrLn $ "cabal-install version: " ++ showVersion ci_ver
   putStrLn $ "cabal-install builtin Cabal version: "
              ++ showEsrVer (f_c_ver V1)
-  putStrLn $ "GHC version: " ++ showVersion g_ver
+  putStrLn $ "GHC executable version: " ++ showVersion g_ver
+  putStrLn $ "GHC library version: " ++ cProjectVersion
   putStrLn $ "Stack version: " ++ showVersion s_ver
   putStrLn $ "Stack Cabal version: " ++ showEsrVer (f_c_ver Stack)
 
+  when (cProjectVersion /= showVersion g_ver) $
+    error "GHC version mismatch! See above."
+
   let proj_impls :: [(ProjType, ProjSetup0)]
       proj_impls =
         [ (V2,    newBuildProjSetup)
-- 
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