我正在尝试使用“子模块/子项目”构建测试项目。
编译失败并显示:
example_01/src/main.cpp:2:10: fatal error: inc/foo2.hpp: No such file or directory
#include "inc/foo2.hpp" // #include "submodule/inc/foo2.hpp"
^~~~~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/hello_world.dir/build.make:63: CMakeFiles/hello_world.dir/src/main.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:73: CMakeFiles/hello_world.dir/all] Error 2
make: *** [Makefile:84: all] Error 2
我的文件:
cmake_minimum_required(VERSION 3.12)
project(hello_world)
set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
include_directories(${PROJECT_SOURCE_DIR})
add_subdirectory("submodule")
add_executable(${PROJECT_NAME}
src/main.cpp
src/foo.cpp)
#include "inc/foo.hpp"
#include "inc/foo2.hpp" // #include "submodule/inc/foo2.hpp"
int main()
{
foo();
foo2();
return 0;
}
#include <iostream>
#include "inc/foo.hpp"
void foo()
{
std::cout << "Hello World!\n";
}
void foo();
project(submodule_dummy1)
add_executable(${PROJECT_NAME} src/foo2.cpp)
#include <iostream>
#include "inc/foo2.hpp"
void foo2()
{
std::cout << "FuuTwo\n";
}
void foo2();
我还需要声明其他内容,以便它可以“看到”子模块头吗?
.
├── build
├── CMakeLists.txt
├── inc
│ └── foo.hpp
├── readme.md
├── src
│ ├── foo.cpp
│ └── main.cpp
└── submodule
├── CMakeLists.txt
├── inc
│ └── foo2.hpp
└── src
└── foo2.cpp
cmake_minimum_required(VERSION 3.12)
project(hello_world)
set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
include_directories(${PROJECT_SOURCE_DIR})
include_directories(${PROJECT_SOURCE_DIR}/submodule)
add_subdirectory("submodule")
add_executable(${PROJECT_NAME}
src/main.cpp
src/foo.cpp)
Scanning dependencies of target hello_world
[ 20%] Building CXX object CMakeFiles/hello_world.dir/src/main.cpp.o
[ 40%] Linking CXX executable hello_world
/usr/bin/ld: CMakeFiles/hello_world.dir/src/main.cpp.o: in function `main':
main.cpp:(.text+0xa): undefined reference to `foo2()'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/hello_world.dir/build.make:99: hello_world] Error 1
make[1]: *** [CMakeFiles/Makefile2:73: CMakeFiles/hello_world.dir/all] Error 2
make: *** [Makefile:84: all] Error 2
答案 0 :(得分:0)
您缺少一个
include_directories(${PROJECT_SOURCE_DIR}/submodule)
在主CMakeLists.txt中。
此外,您还需要编译和链接submodule/src/foo2.cpp
(通过将其作为参数添加到主CMakeLists.txt中的add_executable
命令中。