如何从 CMake 中的另一个目录引用可执行文件？

Question

我的项目结构：

/external-source-generating-tool
/external-source-generating-tool/CMakeLists.txt
/external-source-generating-tool/*.cpp
/src
/src/CMakeLists.txt
/src/*.cpp
/CMakeLists.txt

CMakeLists.txt:

add_subdirectory(external-source-generating-tool)
add_subdirectory(src)

/src/CMakeLists.txt:

add_custom_command(OUTPUT generated-source.cpp
    COMMAND external-source-generating-tool -o generated-source.cpp
    MAIN_DEPENDENCY external-source-generating-tool
    COMMENT "Generating...")

add_executable(my-app source1.cpp generated-source.cpp)

问题是/src/CMakeLists.txt找不到external-source-generating-tool:

Error:Cannot find source file:
external-source-generating-tool
Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp .hxx .in .txx

如何从 /src/CMakeLists.txt 正确调用 external-source-generating-tool？

Answer 1

问题出在 add_custom_command 的 MAIN_DEPENDENCY external-source-generating-tool 参数上。我将其替换为 DEPENDS external-source-generating-tool:

add_custom_command(OUTPUT generated-source.cpp
    COMMAND external-source-generating-tool -o generated-source.cpp
    DEPENDS external-source-generating-tool
    COMMENT "Generating...")

现在一切正常。

如何从 CMake 中的另一个目录引用可执行文件？

How to refer executable from another directory in CMake?

build

cmake

code-generation