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  1. int main ()
  2. {
  3. extern int foo();
  4. return foo();
  5. }
Compilation error #stdin compilation error #stdout 0s 0KB
stdin
Standard input is empty
compilation info
/home/VhdGV2/cc5qK0i6.o: In function `main':
prog.cpp:(.text.startup+0x7): undefined reference to `foo()'
collect2: error: ld returned 1 exit status
stdout

Standard output is empty