Fix Travis coverage (#19)

Signed-off-by: Isaac Hier <[email protected]>

Author: isaachier

.travis.yml

@@ -12,7 +12,8 @@ matrix:
         - g++-6
         - lcov
     env:
-    - MATRIX_EVAL="CC=gcc-6 && CXX=g++-6 && COVERAGE=ON"
+    - MATRIX_EVAL="CC=gcc-6 && CXX=g++-6"
+    - COVERAGE=ON
   - os: linux
     addons:
       apt:

scripts/build.sh

@@ -21,7 +21,7 @@ function working() {
 
 mkdir -p build
 cd build || exit
-if [ $COVERAGE != "" ]; then
+if [ "x$COVERAGE" != "x" ]; then
   cmake -DCMAKE_BUILD_TYPE=Debug -DJAEGERTRACING_COVERAGE=ON ..
 else
   cmake -DCMAKE_BUILD_TYPE=Debug -DJAEGERTRACING_COVERAGE=OFF ..