Question

我正在尝试使用gcc 4.8.2和lcov 1.10获得测试的html覆盖率。我确信我的源代码，对象和gcov文件位于同一个地方，并且我从运行编译器的目录运行lcov。

我收到以下错误：

$ lcov --capture --directory "objs/i386/MinGW/Os_SingleCore_SC3
/IocTest_tests_SingleCore_SC3" --output-file coverage.info
Capturing coverage data from objs/i386/MinGW/Os_SingleCore_SC3/IocTest_tests_SingleCore_SC3
Found gcov version: 4.8.2
Scanning objs/i386/MinGW/Os_SingleCore_SC3/IocTest_tests_SingleCore_SC3 for .gcda files ...
Found 3 data files in objs/i386/MinGW/Os_SingleCore_SC3/IocTest_tests_SingleCore_SC3
Processing IocTest_tests_SingleCore_SC3/IocTest.gcda
geninfo: WARNING: cannot find an entry for objs#i386#MinGW#Os_SingleCore_SC3#IocTest_tests_SingleCore_SC3#IocTest.c.gcov in .gcno file, skipping file!
geninfo: WARNING: no data found for /cygdrive/e/testRepo/WinPort-Os-cd354a27d1d9/WinPort/Os/Tests/OS_REQ/objs\i386\MinGW\Os_SingleCore_SC3\IocTest_tests_SingleCore_SC3\IocTest.c
Processing IocTest_tests_SingleCore_SC3/OS_REQ.gcda
geninfo: WARNING: cannot find an entry for objs#i386#MinGW#Os_SingleCore_SC3#IocTest_tests_SingleCore_SC3#OS_REQ.c.gcov in .gcno file, skipping file!
geninfo: WARNING: no data found for /cygdrive/e/testRepo/WinPort-Os-cd354a27d1d9/WinPort/Os/Tests/OS_REQ/objs\i386\MinGW\Os_SingleCore_SC3\IocTest_tests_SingleCore_SC3\OS_REQ.c
Processing IocTest_tests_SingleCore_SC3/TestMain.gcda
geninfo: WARNING: cannot find an entry for objs#i386#MinGW#Os_SingleCore_SC3#IocTest_tests_SingleCore_SC3#TestMain.c.gcov in .gcno file, skipping file!
geninfo: WARNING: no data found for /cygdrive/e/testRepo/WinPort-Os-cd354a27d1d9/WinPort/Os/Tests/OS_REQ/objs\i386\MinGW\Os_SingleCore_SC3\IocTest_tests_SingleCore_SC3\TestMain.c
Finished .info-file creation

Answer 1

首先，我建议检查 gcov 是否返回正确的覆盖率数据。意味着需要运行gcov工具并检查* .gcov文件以获得实际结果。如果它返回任何覆盖范围。

其次，您可以使用 - base-directory ，例如

$ lcov --base-directory .  --directory . -c -o gcov/lcov.info

Answer 2

我发现这些步骤有效：https://codeflu.blog/2014/12/26/using-gcov-and-lcov-to-generate-beautiful-c-code-coverage-statistics/

您是否先使用-g -O0和--coverage标记进行编译？您是否将.gcno文件从构建目录复制到包含.gcda文件的同一目录？

您是否尝试过添加选项--ignore-errors gcov，source，graph？它实际上可能来自某些文件，这将确保lcov继续运行任何问题文件。如果您找到有效的文件，那么您可以退后一步，找出上述文件无法用于lcov的原因。也许他们错过了相应的.gcno文件。

Answer 3

更新CMakeList.txt以添加以下标志：

SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -O0 -fprofile-arcs -ftest-coverage") set(CMAKE_CXX_OUTPUT_EXTENSION_REPLACE 1)

转到构建目录 cd {project/lib} rm -rf * //Remove all items if you want cmake .. make ./MyTest //运行测试用例以获取.gcda文件。可能还有其他方式生成gcda文件，但我更喜欢这种方式

lcov --capture --directory . --output-file AnyName.info //AnyName.info将包含输出 genhtml AnyName.info --output-directory CODE_COVERAGE 您将在当前目录中找到一个目录CODE_COVERAGE，转到CODE_COVERAGE并双击index.html，它将显示测试用例的当前代码覆盖率

cd {project/lib} rm -rf * cmake .. make ./MyTest lcov --capture --directory . --output-file AnyName.info genhtml AnyName.info --output-directory CODE_COVERAGE

lcov无法正常覆盖

3 个答案: