默认情况下如何配置cmake以获取可执行文件 [英] How to configure cmake to get an executable not by default

问题描述

我有一个与cmake有关的小项目.我建立一个库和一个可执行文件.在开发计算机上，我还需要一个无法在其他计算机/环境上构建的可执行文件.

I have a small project with cmake. I build a lib and an executable. on the development machine I want also an executable that cannot be build on other machines/environments.

例如:

<my-lib>
 | -- CMakeLists.txt
 |
 + -- src/             -> build the lib/archive
 |     |-- lib.c
 |     |-- lib.h
 |     |-- CMakeLists.txt
 |
 + -- tool             -> build the tool
 |     |-- tool.c
 |     |-- CMakeLists.txt
 |
 + -- tests            -> build the unit tests
 |     |-- tests.c
 |     |-- CMakeLists.txt

我将 CMakeLists.txt 添加到了所有目录.也是测试的 add_executable .现在，默认情况下会生成单元测试可执行文件.但我想将其从默认目标中排除.

I added CMakeLists.txt to all directories. Also an add_executable to the tests. Now the unit-test executable is build by default. But I want to exclude it from default target.

CMakeLists.txt :

find_library (CUNIT_LIB cunit)
include_directories (${Cunit_INCLUDE_DIRS} "${PROJECT_SOURCE_DIR}/src")

set (CMAKE_C_FLAGS "-O2 -Wall -Werror")

add_executable (unit-test tests.c)

target_link_libraries (unit-test my-lib cunit)

有人提示如何处理吗?我不想总是建立单元测试！

Has anyone a hint how to handle this? I don't want to build unit-test always!

推荐答案

这很简单:通过引入选项/变量来保护可执行文件的创建.

This is very simple: protect creation of executable by introducing an option/variable.

if (DEFINED WITH_UNIT_TEST)
  find_library (CUNIT_LIB cunit)
  include_directories (${Cunit_INCLUDE_DIRS} "${PROJECT_SOURCE_DIR}/src")

  set (CMAKE_C_FLAGS "-O2 -Wall -Werror")

  add_executable (unit-test tests.c)

  target_link_libraries (unit-test my-lib cunit)
endif ()

现在，当调用CMake时，必须显式指定 -DWITH_UNIT_TEST ，以便构建 unit-test 目标，而默认情况下将永远不会构建它.有关替代方法，请参见注释.

Now when invoking CMake, one would have to explicitly specify -DWITH_UNIT_TEST, so that unit-test target is built, while by default it will never be build. For alternative approach, see comments.

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