cmake add_custom_command失败，目标被删除 [英] cmake add_custom_command failure, target gets deleted

问题描述

我正在使用CMake构建测试可执行文件。在构建过程中，我想运行可执行文件，该可执行文件将返回测试是否通过。如果没有，我希望构建失败。但是，当我使用 add_custom_command（... POST_BUILD ...）并使用 Makefile 生成器时，测试可执行文件将被删除（此问题的解释： GNU为什么要删除文件）。

I am building a test executable using CMake. During the build process, I would like to run the executable, which returns whether the tests pass or not. If not, I would like the build to fail. However, when I use add_custom_command(... POST_BUILD ... ), and use a Makefile generator, the test executable will be deleted (explain in this question: Why does GNU make delete a file).

是否可以使CMake将可执行文件视为 .PRECIOUS ，或者更改CMakeLists.txt这样，如果测试失败，可执行文件就不会被删除？

Is there a way to have CMake treat the executable as a .PRECIOUS, or otherwise change the CMakeLists.txt such that the executable doesn't get deleted if the tests fail?

作为参考，我的CMakeList.txt如下所示（从实际简化）：

For reference, my CMakeList.txt looks like the following (simplified from actual):

add_executable(UnitTest unittest.cpp)
add_custom_command(TARGET UnitTest POST_BUILD COMMAND $<TARGET_FILE:UnitTest>)

推荐答案

我提到的解决方案是使用 add_custom_target ，而不是 add_custom_command 。虽然如果测试失败，它将不会删除可执行文件，如果runUnitTest失败，则整个构建过程也会失败，但是由于专门构建UnitTest目标，因此不会构建此目标。

The solution that I was alluding to was to use add_custom_target instead of add_custom_command. While it will not delete the executable if the test fails and the build process as a whole fails if runUnitTest fails, this target does not get built as a result of building the UnitTest target specifically.

add_executable(UnitTest unittest.cpp)
add_custom_target(runUnitTest UnitTest COMMAND $<TARGET_FILE:UnitTest> DEPENDS UnitTest)

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