1. main.cpp

#include 
    
     using namespace std;extern "C" int GetValueFromGAS();int main(){    cout << "GAS said " << GetValueFromGAS() << endl;    return 0;}
    

2. asm.asm

.section .text.global GetValueFromGASGetValueFromGAS:    movq $25, %rax    ret

3. 编译

as asm.asm -o asm.og++ asm.o main.cpp -o runme

4. 运行

./runme GAS said 25