From cec921f15cb8c326fe81f6e32aebec1516ca36e6 Mon Sep 17 00:00:00 2001
From: Daniel Gröber <dxld@darkboxed.org>
Date: Wed, 21 Aug 2019 00:08:54 +0200
Subject: Implement cabal v2 backpack unit workaround

See https://github.com/haskell/cabal/issues/6201 for details about the bug
---
 lib/Distribution/Helper.hs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'lib')

diff --git a/lib/Distribution/Helper.hs b/lib/Distribution/Helper.hs
index 55bfbf7..e46293d 100644
--- a/lib/Distribution/Helper.hs
+++ b/lib/Distribution/Helper.hs
@@ -508,7 +508,11 @@ buildProjectTarget qe mu stage = do
           SCV2 -> do
             targets <- return $ case mu of
               Nothing -> ["all"]
-              Just Unit{uImpl} -> uiV2Components uImpl
+              Just Unit{uImpl} -> concat
+                [ if uiV2OnlyDependencies uImpl
+                    then ["--only-dependencies"] else []
+                , uiV2Components uImpl
+                ]
             case qeProjLoc of
               ProjLocV2File {plCabalProjectFile} ->
                 [ "--project-file="++plCabalProjectFile
-- 
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