未定义对`func'的引用多文件编译

如何解决未定义对`func'的引用多文件编译

我对使用c ++进行多文件编译非常陌生，我正在尝试通过测试来理解它。但是在下面的示例中，我收到错误undefined reference to `func()'，但我不明白为什么。预先感谢！

Main.cpp

#include <iostream>
#include "file1.h"

int main() {
    func();
    return 0;
}

File1.h

#ifndef UNTITLED1_FILE1_H
#define UNTITLED1_FILE1_H
#include <iostream>

void func();

#endif //UNTITLED1_FILE1_H

File1.cpp

#include "file1.h"

void func() {
    std::cout << "Test" << std::endl;
}

CMAKELIST

cmake_minimum_required(VERSION 3.17)
project(untitled1)

set(CMAKE_CXX_STANDARD 14)

add_executable(untitled1 main.cpp file1.h)

解决方法

基本上，您还没有包含所有源文件。另外，您还没有指定包含目录。

cmake_minimum_required(VERSION 3.17)

# Never name your project the same thing as any of your targets
project(COOL_PROJECT)

set(CMAKE_CXX_STANDARD 14)

add_executable(untitled1)

# You must include all source files,header files are optional.
# However adding header files explicitly will result in better IDE support
#
# Prefer to add source files using target_sources instead
target_sources(untitled1 PRIVATE
    main.cpp
    file1.cpp
    file1.h
)

# Add your current directory as an include directory.
target_include_directories(untitiled PRIVATE ${CMAKE_CURRENT_LIST_DIR})

顺便说一句，套管很重要。因此，请确保文件名大小写匹配。

File1.cpp！= file1.cpp