我构建了许多源代码，然后运行 gcovr 并输出JSON：

foreach(COMPONENT IN LISTS BLAHDIBLAH)
   ...
   add_custom_command(TARGET ${COMPONENT}_coverage
               COMMAND gcovr --exclude-unreachable-branches -k -r ${CMAKE_CURRENT_SOURCE_DIR} --json -o ${COMPONENT}_coverage_lines.json ${CMAKE_BINARY_DIR}/CMakeFiles/${COMPONENT}_test.dir/${UNIT_PATH_${COMPONENT}}
               COMMAND gcovr --exclude-unreachable-branches -k -r ${CMAKE_CURRENT_SOURCE_DIR} --json -b -o ${COMPONENT}_coverage_branches.json ${CMAKE_BINARY_DIR}/CMakeFiles/${COMPONENT}_test.dir/${UNIT_PATH_${COMPONENT}}
   )

   list(APPEND COV_DEPS ${COMPONENT}_coverage)
   ...
endforeach()

稍后，我添加了一个coverage目标来合并 gcovr 输出：

add_custom_target(coverage
            COMMAND gcovr --exclude-unreachable-branches -k -r .. --add-tracefile coverage/*.json --html-details coverage/coverage.html
            WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
            )

如果我运行make coverage，gcovr 只拾取第一个源文件，但如果我手动运行命令：

gcovr --exclude-unreachable-branches -k -r .. --add-tracefile coverage/*.json --html-details coverage/coverage.html

......那么所有的信号源都会被接收。
为什么该命令在终端中有效，而在CMake中无效？