From 2c7cd2455e39819748792f21b538dc8410afbc3a Mon Sep 17 00:00:00 2001
From: Orivej Desh <orivej@gmx.fr>
Date: Mon, 4 Dec 2017 15:15:58 +0000
Subject: [PATCH] ninja: support disabling parallel building

but keep it enabled by default
---
 .../development/tools/build-managers/ninja/setup-hook.sh | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/tools/build-managers/ninja/setup-hook.sh b/pkgs/development/tools/build-managers/ninja/setup-hook.sh
index 9ea6549a824..d9ad7460931 100644
--- a/pkgs/development/tools/build-managers/ninja/setup-hook.sh
+++ b/pkgs/development/tools/build-managers/ninja/setup-hook.sh
@@ -4,9 +4,16 @@ ninjaBuildPhase() {
     if [[ -z "$ninjaFlags" && ! ( -e build.ninja ) ]]; then
         echo "no build.ninja, doing nothing"
     else
+        local buildCores=1
+
+        # Parallel building is enabled by default.
+        if [ "${enableParallelBuilding-1}" ]; then
+            buildCores="$NIX_BUILD_CORES"
+        fi
+
         # shellcheck disable=SC2086
         local flagsArray=( \
-            ${enableParallelBuilding:+-j${NIX_BUILD_CORES} -l${NIX_BUILD_CORES}} \
+            -j"$buildCores" -l"$NIX_BUILD_CORES" \
             $ninjaFlags "${ninjaFlagsArray[@]}" \
             $buildFlags "${buildFlagsArray[@]}")