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created by

anonymous

50 seconds ago

​x
 
int& test1(){
    int a = 10;
    int& res = a;
    return res;
}
int& test2(){
    int a = 10;
    return a;
}

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$ clang++ prog.cc -Wall -Wextra -std=gnu++2a

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prog.cc:4:12: warning: reference to stack memory associated with local variable 'a' returned [-Wreturn-stack-address]
    return res;
           ^~~
prog.cc:3:10: note: binding reference variable 'res' here
    int& res = a;
         ^     ~
prog.cc:8:12: warning: reference to stack memory associated with local variable 'a' returned [-Wreturn-stack-address]
    return a;
           ^
2 warnings generated.
/usr/lib/gcc/x86_64-linux-gnu/5.5.0/../../../x86_64-linux-gnu/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
clang-11: error: linker command failed with exit code 1 (use -v to see invocation)

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