add coveralls auto tool to json-c

.travis.yml

@@ -78,6 +78,23 @@ matrix:
       osx_image: xcode10.1
       env: XCODE="true" CHECK="true"
 
+#   run coveralls
+    - os: linux
+      dist: xenial
+      compiler: gcc
+      env: CHECK="true"
+      before_install:
+        - sudo pip install cpp-coveralls
+      script:
+        - mkdir build
+        - cd build
+        - cmake ..
+        - make
+        - make test
+        - cd -
+      after_success:
+        - coveralls --include arraylist.c --include arraylist.h --include json_object.c --include json_object.h --include json_object_iterator.c --include json_object_iterator.h --include json_object_private.h --include json_pointer.c --include json_pointer.h --include json_tokener.c --include json_tokener.h --include json_util.c --include json_util.h --include json_visit.c --include json_visit.h --include linkhash.c --include linkhash.h --include printbuf.c --include printbuf.h --include random_seed.c --include strerror_override.c
+
 #  allow_failures:
 #    - os: osx
 

CMakeLists.txt

@@ -197,6 +197,7 @@ message(STATUS "Written ${PROJECT_BINARY_DIR}/json_config.h")
 
 if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
     set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} -ffunction-sections -fdata-sections")
+    set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} -fprofile-arcs -ftest-coverage")
 	if ("${DISABLE_WERROR}" STREQUAL "OFF")
 	    set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} -Werror")
 	endif()