CMake 为什么不能将 .exe 用于自定义目标

Question

这里是CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
project("cmake_oneoneone")
add_executable(main src/main.cpp)
set(library_name liba CACHE string "This variable is the library name")
add_library(${library_name} STATIC src/liba.cpp)
target_link_libraries(main ${library_name})
include_directories(include)
add_custom_target(run_main
              COMMAND ./main
              DEPENDS main
              )

输出为：

~/workspace/cmake_test/build$ make run_main
[ 50%] Built target liba
[100%] Built target main 
Hello world!
[100%] Built target run_main

但是如果我将可执行文件更改为 .exe

cmake_minimum_required(VERSION 2.8)
project("cmake_oneoneone")
add_executable(main.exe src/main.cpp)
set(library_name liba CACHE string "This variable is the library name")
add_library(${library_name} STATIC src/liba.cpp)
target_link_libraries(main.exe ${library_name})
include_directories(include)
add_custom_target(run_main
              COMMAND ./main.exe
              DEPENDS main.exe
              )

~/workspace/cmake_training/build$ make run_main
make[3]: *** No rule to make target `../main.exe', needed by `CMakeFiles/run_main'.  Stop.
make[2]: *** [CMakeFiles/run_main.dir/all] Error 2
make[1]: *** [CMakeFiles/run_main.dir/rule] Error 2
make: *** [run_main] Error 2

我在 CMake 上尝试了 Linux 和 Windows，两者的行为相同。

Answer 1

如果您查看 ADD_EXECUTABLE 命令的文档，您会发现 CMake 会自动将扩展名 .exe 添加到您的可执行文件中，以防您在 Windows 环境中生成它。如果你在Linux，显然生成一个.exe是没有意义的：

Adds an executable target called to be built from the source files listed in the command invocation. The corresponds to the logical target name and must be globally unique within a project. The actual file name of the executable built is constructed based on conventions of the native platform (such as .exe or just ).

因此您不必在可执行文件名称的末尾添加 .exe。

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