From 5e2eb803e82e663caa6cd1252a790ba4a1c43adb Mon Sep 17 00:00:00 2001
From: Daniel Gröber <dxld@darkboxed.org>
Date: Sun, 17 Jun 2018 16:05:35 +0200
Subject: ci: Limit compile-test build concurrency

---
 scripts/ci/steps/00-config.sh          |  2 ++
 src/CabalHelper/Compiletime/Compile.hs | 14 ++++++++++----
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/scripts/ci/steps/00-config.sh b/scripts/ci/steps/00-config.sh
index b6c3140..eb8280a 100644
--- a/scripts/ci/steps/00-config.sh
+++ b/scripts/ci/steps/00-config.sh
@@ -8,3 +8,5 @@ fi
 
 source_dir="$(mktemp --tmpdir -d "cabal-helper.sdistXXXXXXXXX")"
 build_dir="$(mktemp --tmpdir -d "cabal-helper.distXXXXXXXXX")"
+
+NPROC=${NPROC:-1}
diff --git a/src/CabalHelper/Compiletime/Compile.hs b/src/CabalHelper/Compiletime/Compile.hs
index bd15537..b39e86f 100644
--- a/src/CabalHelper/Compiletime/Compile.hs
+++ b/src/CabalHelper/Compiletime/Compile.hs
@@ -36,10 +36,12 @@ import Data.String
 import Data.Version
 import GHC.IO.Exception (IOErrorType(OtherError))
 import Text.Printf
+import Text.Read
 import System.Directory
 import System.FilePath
 import System.Process
 import System.Exit
+import System.Environment
 import System.IO
 import System.IO.Error
 import System.IO.Temp
@@ -452,16 +454,20 @@ runSetupHs opts@Options {..} db srcdir ever CabalInstallVersion {..}
       SetupProgram {..} <- compileSetupHs opts db srcdir
       go $ callProcessStderr opts (Just srcdir) setupProgram
   where
-    parmake_opt
-        | Left _ <- ever = ["-j"]
-        | Right ver <- ever,  ver >= Version [1,20] [] = ["-j"]
+    parmake_opt :: Maybe Int -> [String]
+    parmake_opt nproc'
+        | Left _ <- ever = ["-j"++nproc]
+        | Right ver <- ever,  ver >= Version [1,20] [] = ["-j"++nproc]
         | otherwise = []
+      where
+        nproc = fromMaybe "" $ show <$> nproc'
 
     go :: ([String] -> IO ()) -> IO ()
     go run = do
       run $ [ "configure", "--package-db", db, "--prefix", db </> "prefix" ]
               ++ withGHCProgramOptions opts
-      run $ [ "build" ] ++ parmake_opt
+      mnproc <- join . fmap readMaybe <$> lookupEnv "NPROC"
+      run $ [ "build" ] ++ parmake_opt mnproc
       run [ "copy" ]
       run [ "register" ]
 
-- 
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