cmake条件编译

#ifndef _CAL_H
#define _CAL_H
#include <iostream>
using namespace std;

void Add(int a,int b);
void Mul(int a,int b);
#endif

#include "cal.h"
  
void Add(int a,int b)
{
        cout<<"[Add result]: "<<a+b<<endl;
}

#include "cal.h"
  
void Mul(int a,int b)
{
        cout<<"[Mul Result]: "<<a*b<<endl;
}

#include "cal.h"
  
int main(void)
{
        cout<<"[System]: input first number"<<endl;
        int a;
        cin>>a;

        cout<<"[System]: input second number"<<endl;
        int b;
        cin>>b;

#ifdef _ADD
        Add(a,b);
#endif

#ifdef _MUL
        Mul(a,b);
#endif

#ifndef _ADD
#ifndef _MUL
        cout<<"[System message]: None"<<endl;
#endif
#endif

        return 0;
}

cmake_minimum_required(VERSION 3.18)

project(test)

include_directories(${PROJECT_SOURCE_DIR}/inc)

option(ADD "calculate a+b" ON)
  
option(MUL "calculate a*b" ON)

set(SRC_DIR ${PROJECT_SOURCE_DIR}/src)

set(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin)

if(ADD AND MUL)
        add_compile_options(-D_ADD)
        add_compile_options(-D_MUL)
        set(SRC_LIST ${SRC_DIR}/main.cc ${SRC_DIR}/Add.cc ${SRC_DIR}/Mul.cc)
        add_executable(cal ${SRC_LIST})
        message("ADD AND MUL")
endif()

if(ADD AND (NOT MUL))
        add_compile_options(-D_ADD)
        set(SRC_LIST ${SRC_DIR}/main.cc ${SRC_DIR}/Add.cc)
        add_executable(add ${SRC_LIST})
        message("ADD AND (not MUL)")
endif()

if((NOT ADD) AND MUL)
        add_compile_options(-D_MUL)
        set(SRC_LIST ${SRC_DIR}/main.cc ${SRC_DIR}/Mul.cc)
        add_executable(mul ${SRC_LIST})
        message("(not ADD) AND MUL")
endif()

if((NOT ADD) AND (NOT MUL))
        set(SRC_LIST ${SRC_DIR}/main.cc)
        add_executable(none ${SRC_LIST})
        message("(NOT ADD) AND (NOT MUL)")
endif()

sudo cmake -DADD=ON -DMUL=ON ..
sudo cmake

sudo cmake -DADD=ON -DMUL=OFF ..
sudo make

sudo cmake -DADD=OFF -DMUL=ON ..
sudo make

sudo cmake -DADD=OFF -DMUL=OFF ..
sudo make