用cmake配置代码覆盖率 [英] configuring code coverage with cmake

问题描述

我在Linux机器上，尝试使用cmake进行项目，而该项目没有源代码.对于代码覆盖率，我研究了gcov并遵循了一个简单的教程，该教程为示例helloWorld.cpp程序生成了适当的文件.唯一的要求是使用-fprofile-arcs -ftest-coverage标志&与-lgcov标志链接，完全可以与-coverage标志链接.

I'm on a linux machine, trying to build a project using cmake that does out of source builds. For code coverage, I looked into gcov and followed a simple tutorial that generate appropriate files for a sample helloWorld.cpp program. The only requirement were to compile with -fprofile-arcs -ftest-coverage flags & link with -lgcov flag, which can be done altogether with -coverage flag.

现在这是棘手的部分.我有一个CMakeLists.txt机智内容，如下所示:

Now here comes the tricky part. I have a CMakeLists.txt wit contents as shown below:

cmake_minimum_required (VERSION 2.8)
project (SomeName)

SET(GCC_COVERAGE_COMPILE_FLAGS "-g -O0 -coverage -fprofile-arcs -ftest-coverage")
SET(GCC_COVERAGE_LINK_FLAGS    "-coverage -lgcov")
SET( CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} ${GCC_COVERAGE_COMPILE_FLAGS}" )
SET( CMAKE_EXE_LINKER_FLAGS  "${CMAKE_EXE_LINKER_FLAGS} ${GCC_COVERAGE_LINK_FLAGS}" )

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

include_directories(include)
set(CATCH_HEADER_PATH ${PROJECT_SOURCE_DIR}/test/catch.hpp)

add_executable(runTest ${PROJECT_SOURCE_DIR}/test/test.cpp ${CATCH_HEADER_PATH}) 

因此，我也包括了适当的编译时标志和链接器标志，并正确地附加了它们.还要注意的另一件事是set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)行，该行表示将在 bin 目录中生成可执行文件.

So I've included appropriate compile time flags as well as linker flags too and appended them correctly. Another thing to note is set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin) line which says that executables will be generated inside bin directory.

现在，除了没有正确生成coverage文件之外，其他所有东西都按预期工作.我按照以下步骤操作:

Now everything works as intended except that coverage files aren't generated properly. I follow these steps :

mkdir build && cd build
cmake ..
make -j4
./bin/runTest

，并且 bin 文件夹中没有其他文件生成.但是，经过进一步检查，我发现还有 build/CMakeFiles/runTest.dir/test 的另一个位置，test.cpp.o最初位于该位置，而在最后一步./bin/runTest之后，有两个新文件-test.cpp.gcda&生成test.cpp.gcno.

and no other file is generated inside bin folder. However on more inspection I found out that there is another location build/CMakeFiles/runTest.dir/test where test.cpp.o resides initially and after the final step ./bin/runTest, two new files - test.cpp.gcda & test.cpp.gcno are generated.

我已经尝试将test/test.cpp复制到 build/CMakeFiles/runTest.dir/test 并运行gcov test.cpp，但是它无法说明-test.gcno:cannot open notes file

I've already tried copying test/test.cpp to build/CMakeFiles/runTest.dir/test and running gcov test.cpp but it fails stating - test.gcno:cannot open notes file

推荐答案

gcov和gcc版本不匹配导致了这种情况. gcc symlink /usr/bin/gcc设置为最新的gcc，与g++相同，但$PATH中的gcov仍指向gcov的旧版本.

A mismatch in gcov and gcc version was making this happen. gcc symlink /usr/bin/gcc was set to newest gcc, same for g++ but gcov in $PATH was still pointing to older version of gcov.

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