protect with set -e

.travis.yml

@@ -21,16 +21,20 @@ compiler:
     - clang
 
 before_install:
+    - set -e
     - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update                         ; fi
     - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install homebrew/science/geant4; fi
+    - set +e
 
 before_script:
-    - $CC --version
+    - set -e
     - mkdir build install rundir
     - cd build
     - cmake .. -DBUILD_FAT=ON -DCMAKE_BUILD_TYPE=${BUILD} -DCMAKE_INSTALL_PREFIX=../install/
+    - set +e
 
 script:
+    - set -e
     - make install
     - cd ../rundir
     - find ../install
@@ -40,4 +44,4 @@ script:
     - ../install/bin/mcpltool myfile.mcpl.gz
     - ../install/bin/mcpltool myfile_filtered.mcpl.gz
     - ../install/bin/mcpltool_fat myfile_filtered.mcpl.gz
-
+    - set +e