库单元测试的覆盖率数据错误

Question

I want to test a complex shared library (cxsc) with the help of cmake. After a lot of trial and error i managed to create a html coverage report but the lines I test, with the boost testing framework, are still red.

This is the script I use to create the coverage report:

rm -fr build_coverage
mkdir build_coverage
cd build_coverage
cmake \
    -DCMAKE_BUILD_TYPE=Coverage \
    ..
make
cd ../tests
make clean
make
cd ../build_coverage
make cxsc_coverage

The cmake part where the coverage report gets created:

# Cleanup lcov
COMMAND ${LCOV_PATH} --zerocounters --directory ${CMAKE_CURRENT_SOURCE_DIR}/build_coverage/CMakeFiles/cxsc.dir/src
COMMAND ${LCOV_PATH} --capture --initial --no-external --directory ${CMAKE_CURRENT_SOURCE_DIR}/build_coverage/CMakeFiles/cxsc.dir/src --output-file ${_outputname}.before

# Run tests
COMMAND LD_LIBRARY_PATH=${CMAKE_CURRENT_SOURCE_DIR}/build_coverage ${_testrunner} ${ARGV3}

# Capturing lcov counters and generating report
COMMAND ${LCOV_PATH} --capture --no-checksum --no-external --directory ${CMAKE_CURRENT_SOURCE_DIR}/build_coverage/CMakeFiles/cxsc.dir/src --output-file ${_outputname}.after
COMMAND ${LCOV_PATH} --add-tracefile ${_outputname}.before --add-tracefile ${_outputname}.after --output-file ${_outputname}.info

COMMAND ${GENHTML_PATH} -o ${_outputname} ${_outputname}.info

Makefile of the test binary (I think this is where the error is):

g++ \
    -o test_runner \
    main.cpp \
    test_interval.cpp \
    -I./../src \
    -I./../src/rts \
    -I./../src/asm \
    -I./../src/fi_lib \
    -I./../build_coverage \
    -L./../build_coverage \
    -lcxsc \
    -Wall -Winline \
    -lboost_unit_test_framework

This is what happens:

1. cmake -DCMAKE_BUILD_TYPE=Coverage .. build_coverage directory is created with a target.dir directory and *.gcno files in it
2. cd tests && make Test executable is created and linked against the shared library in the build_coverage directory ( Maybe here is my mistake )
3. make coverage Coverage data is collected and tests are executed

Edit:

To clarify my problem, there are some lines covered but only global consts or one helper function which is used pretty often. But not the functions/methods I call in my tests.

Files in build_coverage/CMakeFiles/cxsc.dir/src/ :

1. After cmake -DC... : A few *.cmake and *.make files
2. After make in build_coverage dir: *.gcno files
3. After lcov -c -i ... : Still *.gcno files
4. After running tests: *.gcda and *.gcno files
5. After lcov -c ... : A lot of movement in the directory but still the same filenames

Answer 1

I don't see any gcov flags in your makefile. Try this one for test_runner :

g++ \
   -Wall -Winline -fprofile-arcs -ftest-coverage \
   main.cpp \
   test_interval.cpp \
   -I./../src \
   -I./../src/rts \
   -I./../src/asm \
   -I./../src/fi_lib \
   -I./../build_coverage \
   -L./../build_coverage \
   -lcxsc \
   -lboost_unit_test_framework \
   -lgcov \
   -o test_runner

Your shared library need those flags too :

SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fprofile-arcs -ftest-coverage")
SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lgcov")

See this post with a similar problem.

NB : "--coverage" can substitute "-fprofile-arcs -ftest-coverage" and "-lgcov"