fixing compilation of tests

Author: Davide Faconti

.gitignore

@@ -1,2 +1,3 @@
 *~
 /CMakeLists.txt.user
+build*

.travis.yml

@@ -23,6 +23,15 @@ matrix:
 
 before_install:
   - sudo apt-get update && sudo apt-get --reinstall install -qq build-essential
+# see motivation here https://www.eriksmistad.no/getting-started-with-google-test-on-ubuntu/
+  - sudo apt-get --reinstall install -qq libgtest-dev cmake
+  - cd /usr/src/gtest
+  - sudo cmake CMakeLists.txt
+  - sudo make
+  - sudo cp *.a /usr/lib
+ 
+# copy or symlink libgtest.a and libgtest_main.a to your /usr/lib folder
+sudo cp *.a /usr/lib
 
 install:
   - if [ "$ROS_DISTRO" != "none" ]; then git clone https://github.com/ros-industrial/industrial_ci.git .ci_config; fi

CMakeLists.txt

@@ -3,7 +3,7 @@ project(behavior_tree_core)
 
 set(CMAKE_BUILD_TYPE Release)
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -std=c++11 -Werror=return-type")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -std=c++11 -pthread -Werror=return-type")
 
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 # http://answers.ros.org/question/230877/optionally-build-a-package-with-catkin/