[bug#44049] [PATCH] build-system/haskell: Disable parallel builds.

[zimoun]

Fixes <https://bugs.gnu.org/43843>.

PARALLEL-BUILD? introduced by commit 67cb9fa2357026ee42ec5bb0923ec4dc4a43abe2
leads to unreproducibility.  Instead of reverting, default is set to #false
which allows user to locally build with parallelism.

* guix/build-system/haskell.scm (haskell-build): Turn off PARALLEL-BUILD? by
default.
---
 guix/build-system/haskell.scm | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/guix/build-system/haskell.scm b/guix/build-system/haskell.scm
index 8304e3b222..87085a50b0 100644
--- a/guix/build-system/haskell.scm
+++ b/guix/build-system/haskell.scm
@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2015 Federico Beffa <beffa@fbengineering.ch>
 ;;; Copyright © 2020 Timothy Sample <samplet@ngyro.com>
+;;; Copyright © 2020 Simon Tournier <zimon.toutoune@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -115,13 +116,17 @@ version REVISION."
                                (cons name propagated-names))))))
                        extra-directories))))))))
 
+;;; PARALLEL-BUILD? introduced by commit
+;;; 67cb9fa2357026ee42ec5bb0923ec4dc4a43abe2 leads to unreproducibility.
+;;; Instead of reverting, default is set to #false which allows user to
+;;; locally build with parallelism. See <http://issues.guix.gnu.org/43843#3>.
 (define* (haskell-build store name inputs
                         #:key source
                         (haddock? #t)
                         (haddock-flags ''())
                         (tests? #t)
                         (test-target "test")
-                        (parallel-build? #t)
+                        (parallel-build? #f)
                         (configure-flags ''())
                         (extra-directories ''())
                         (phases '(@ (guix build haskell-build-system)

base-commit: d14221bf65cfbe7f8f5b7cac44132087cab70bf5
-- 
2.28.0