Update .travis.yml

Author: inkooboo

.travis.yml

@@ -16,6 +16,7 @@ compiler:
 
 install:
   - if [ "$CXX" = "g++" ]; then export CXX="g++-6"; fi
+  - export GCOV="gcov-6"
 
 script:
   - $CXX --version
@@ -32,11 +33,11 @@ after_success:
   - cmake -DCMAKE_BUILD_TYPE=Debug -DCOVERAGE=yes ..
   - make
   - ctest
-  - lcov --gcov-tool  --directory . --capture --output-file coverage.info
-  - lcov --gcov-tool gcov-6 --remove coverage.info '/usr/*' --output-file coverage.info 
-  - lcov --gcov-tool gcov-6 --remove coverage.info 'googletest' --output-file coverage.info 
-  - lcov --gcov-tool gcov-6 --remove coverage.info '*.t.cpp' --output-file coverage.info 
-  - lcov --gcov-tool gcov-6 --list coverage.info
+  - lcov --gcov-tool $GCOV --directory . --capture --output-file coverage.info
+  - lcov --gcov-tool $GCOV --remove coverage.info '/usr/*' --output-file coverage.info 
+  - lcov --gcov-tool $GCOV --remove coverage.info 'googletest' --output-file coverage.info 
+  - lcov --gcov-tool $GCOV --remove coverage.info '*.t.cpp' --output-file coverage.info 
+  - lcov --gcov-tool $GCOV --list coverage.info
   - bash <(curl -s https://codecov.io/bash) || echo "Codecov did not collect coverage reports"
   - cd ..