From d96a038e8b2bce971192669f3ea3965612678633 Mon Sep 17 00:00:00 2001
From: Herbert Thielen <thielen@hs-worms.de>
Date: Mon, 4 Sep 2017 18:19:06 +0200
Subject: [PATCH] set MAKEFLAGS to use multiple processors on Travis CI

---
 travis.sh | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/travis.sh b/travis.sh
index bd226a8d..3a6c297a 100755
--- a/travis.sh
+++ b/travis.sh
@@ -1,5 +1,16 @@
 #!/usr/bin/env sh
 set -evx
+
+# if possible, ask for the precise number of processors,
+# otherwise take 2 processors as reasonable default; see
+# https://docs.travis-ci.com/user/speeding-up-the-build/#Makefile-optimization
+if [ -x /usr/bin/getconf ]; then
+    MAKEFLAGS=j$(/usr/bin/getconf _NPROCESSORS_ONLN)
+else
+    MAKEFLAGS="j2"
+fi
+export MAKEFLAGS
+
 env | sort
 
 mkdir build || true