build CHANGE move -coverage from cmake config to Travis

Seems that the -coverage option is not very portable (#17), so move
it from DEBUG build in cmake into the Travis config file, since we
codecov from Travis.

.travis.yml

@@ -18,7 +18,7 @@ before_install:
   - cd cmocka-1.0.1 && mkdir build && cd build
   - cmake -DCMAKE_INSTALL_PREFIX:PATH=/usr .. && make -j2 && sudo make install
   - cd ../..
-  - if [ "${CC}" = "gcc" ]; then pip install --user codecov; fi
+  - if [ "${CC}" = "gcc" ]; then pip install --user codecov; export CMAKE_C_FLAGS="-coverage"; fi
 
 script: 
   - mkdir build && cd build && cmake .. && make -j2 && make test

CMakeLists.txt

@@ -33,7 +33,7 @@ endif()
 
 set(CMAKE_C_FLAGS         "${CMAKE_C_FLAGS} -Wall -Wextra -fvisibility=hidden")
 set(CMAKE_C_FLAGS_RELEASE "-O2 -DNDEBUG")
-set(CMAKE_C_FLAGS_DEBUG   "-coverage -g -O0")
+set(CMAKE_C_FLAGS_DEBUG   "-g -O0")
 
 if(CMAKE_BUILD_TYPE STREQUAL debug)
 	option(ENABLE_BUILD_TESTS "Build tests" ON)