travis-ci: Add codecov integration

References
  https://github.com/codecov/example-cpp11-cmake

.travis.yml

@@ -7,7 +7,7 @@ language: c
 
 addons:
   apt:
-    packages: [ cpanminus ]
+    packages: [ cpanminus lcov ]
   homebrew:
     packages: [ cpanminus ]
 
@@ -19,7 +19,8 @@ env:
 
 matrix:
   include:
-    - os: linux
+    - env: COV=-DCODE_COVERAGE=ON
+      os: linux
       compiler: gcc
     - env: LABEL="linux-ppc64le" CMAKE_VERSION=3.15.1
       os: linux-ppc64le
@@ -49,6 +50,12 @@ script:
   - if [ "${TRAVIS_OS_NAME}" = "osx" ]; then export DYLD_LIBRARY_PATH="${PREFIX}/lib:${DYLD_LIBRARY_PATH:-}"; fi
   - mkdir build
   - cd build
-  - cmake -DOPENSSL_ROOT_DIR=${PREFIX} -DOPENSSL_LIBRARIES=${PREFIX}/lib -DOPENSSL_ENGINES_DIR=${PREFIX}/engines ${ASAN} ..
+  - cmake -DOPENSSL_ROOT_DIR=${PREFIX} -DOPENSSL_LIBRARIES=${PREFIX}/lib -DOPENSSL_ENGINES_DIR=${PREFIX}/engines ${ASAN} ${COV} ..
   - if [ ! -z ${COVERITY_SCAN_TOKEN+x} -a "${RUN_COVERITY}" = "1" ]; then curl -s "https://scan.coverity.com/scripts/travisci_build_coverity_scan.sh" | bash || true; else make; fi
   - make test CTEST_OUTPUT_ON_FAILURE=1
+
+after_success:
+  - lcov --capture --directory . --output-file coverage.info
+  - lcov --remove coverage.info '/usr/*' --output-file coverage.info
+  - lcov --list coverage.info
+  - bash <(curl -s https://codecov.io/bash) -f coverage.info || echo "Codecov did not collect coverage reports"

CMakeLists.txt

@@ -26,6 +26,12 @@ if (ASAN)
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=address -g3 -fno-omit-frame-pointer")
 endif()
 
+option(CODE_COVERAGE "Enable coverage reporting" OFF)
+if (CODE_COVERAGE)
+  message(STATUS "Code coverage enabled")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} --coverage")
+endif(CODE_COVERAGE)
+
 set(CMAKE_C_STANDARD 90)
 CHECK_FUNCTION_EXISTS(clock_gettime HAVE_CLOCK_GETTIME_C)
 CHECK_LIBRARY_EXISTS(rt clock_gettime "" HAVE_CLOCK_GETTIME_RT)