c++ Cmake工程（1）同級目錄

MKT-porter發表於2024-08-03
C++

A類呼叫了B類，C主函式呼叫A和B

A.h

#ifndef A_H
#define A_H

#include <iostream>


//#include "../folder2/B.h" // 正常情況
//# 包含根目錄 A.h可以直接引用 B.h
//target_include_directories(folder1_lib PUBLIC ${CMAKE_SOURCE_DIR})
#include "folder2/B.h" // 特殊情況

class A {
public:
    void doSomething();
};

#endif // A_H

　　

　　A.cpp

#include "A.h"

void A::doSomething() {
    std::cout << "Class A is doing something." << std::endl;

    B b;
    b.performAction();
}

　　

B.h

#ifndef B_H
#define B_H

#include <iostream>

class B {
public:
    void performAction();
};

#endif // B_H

　B.cpp

　

#include "B.h"

void B::performAction() {
    std::cout << "Class B is performing an action." << std::endl;
}

　　

main.cpp

// 直接路徑 沒有經過 target_include_directories(main PRIVATE ${CMAKE_SOURCE_DIR})
#include "folder1/A.h"
#include "folder2/B.h"

int main() {
    A a;
    B b;

    // 呼叫 A 類的函式
    a.doSomething();

    // 呼叫 B 類的函式
    b.performAction();

    return 0;
}

　　

　CMakeLists_1 最簡單 直接相對路徑呼叫檔案.txt

cmake_minimum_required(VERSION 3.5)
project(MyProject)

# Set C++ standard
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

# Include directories
include_directories(${CMAKE_SOURCE_DIR}/folder1)
include_directories(${CMAKE_SOURCE_DIR}/folder2)

# Source files in folders
set(folder1_sources
    folder1/A.cpp
)

set(folder2_sources
    folder2/B.cpp
)

# Main executable
add_executable(main main.cpp ${folder1_sources} ${folder2_sources})

　　

CMakeLists_2 中等 編譯成庫呼叫.txt

cmake_minimum_required(VERSION 3.0)
project(MyProject)

# 設定編譯選項
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

#project_folder/
#│
#├── CMakeLists.txt
#├── folder1/
#│   ├── A.h
#│   └── A.cpp
#│
#└── folder2/
#    ├── B.h
#    └── B.cpp


# 新增資料夾1中的原始檔
add_library(folder1_sources
    folder1/A.cpp
)

# 新增資料夾2中的原始檔
add_library(folder2_sources
    folder2/B.cpp
)

# 新增可執行檔案並連結兩個庫
add_executable(main_executable main.cpp)
target_link_libraries(main_executable folder1_sources folder2_sources)

# 新增包含資料夾的路徑 應該無用 這裡有用是因為main.c和folder1 folder2在同級目錄
target_include_directories(folder1_sources PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/folder1) target_include_directories(folder2_sources PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/folder2)

　

CMakeLists.txt 3最簡潔但是難以理解的方案

cmake_minimum_required(VERSION 3.5)
project(MyProject)

# Set C++ standard
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

# Add subdirectories
add_subdirectory(folder1)
add_subdirectory(folder2)


# Main executable
add_executable(main main.cpp)

target_include_directories(main PRIVATE ${CMAKE_SOURCE_DIR}) # 避免相對路徑使用 但是main本來就是相對路徑

# Link main executable with folder1_lib and folder2_lib
target_link_libraries(main PRIVATE folder1_lib folder2_lib)

　　

# Create a library for folder1 (assuming A.cpp is compiled into a library)
add_library(folder1_lib A.cpp A.h)

# 包含根目錄 A.h可以直接引用 B.h
target_include_directories(folder1_lib PUBLIC ${CMAKE_SOURCE_DIR})

# Link folder1_lib with folder2_lib (assuming it uses B from folder2)
target_link_libraries(folder1_lib PUBLIC folder2_lib)

　　

# Create a library for folder2 (assuming B.cpp is compiled into a library)
add_library(folder2_lib B.cpp B.h)

# Set include directories for folder2 (optional, if needed)
target_include_directories(folder2_lib PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})

　　

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