From adad6e0a1c2bb6cd5e56db26d660fa9342cf0d0e Mon Sep 17 00:00:00 2001
From: Tim <t4im@users.noreply.github.com>
Date: Sat, 15 Oct 2016 17:59:23 +0200
Subject: [PATCH] Travis: Only trigger a compile, when C/C++ related files were
 touched (#4284)

---
 util/travis/before_install.sh | 4 ++++
 util/travis/common.sh         | 8 ++++++++
 util/travis/script.sh         | 3 +++
 3 files changed, 15 insertions(+)
 create mode 100644 util/travis/common.sh

diff --git a/util/travis/before_install.sh b/util/travis/before_install.sh
index d25614edb..891371984 100755
--- a/util/travis/before_install.sh
+++ b/util/travis/before_install.sh
@@ -1,4 +1,8 @@
 #!/bin/bash -e
+echo "Preparing for $TRAVIS_COMMIT_RANGE"
+. util/travis/common.sh
+
+needs_compile || exit 0
 
 if [[ $TRAVIS_OS_NAME == "linux" ]]; then
 	sudo apt-get update
diff --git a/util/travis/common.sh b/util/travis/common.sh
new file mode 100644
index 000000000..16c7db324
--- /dev/null
+++ b/util/travis/common.sh
@@ -0,0 +1,8 @@
+#!/bin/bash -e
+
+# Relative to git-repository root:
+TRIGGER_COMPILE_PATHS="src/|CMakeLists.txt|cmake/Modules/|util/travis/|util/buildbot/"
+
+needs_compile() {
+	git diff --name-only $TRAVIS_COMMIT_RANGE | egrep -q "^($TRIGGER_COMPILE_PATHS)"
+}
diff --git a/util/travis/script.sh b/util/travis/script.sh
index 4f37d8f5a..1bafb26cd 100755
--- a/util/travis/script.sh
+++ b/util/travis/script.sh
@@ -1,4 +1,7 @@
 #!/bin/bash -e
+. util/travis/common.sh
+
+needs_compile || exit 0
 
 if [[ $PLATFORM == "Unix" ]]; then
 	mkdir -p travisbuild