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1extern "C" int a();2 3int main() {4 return a();5}6 7// Built with gcc 4.6.38// $ mkdir -p /tmp/dbginfo9// $ cp dwarfdump-test2-helper.cc dwarfdump-test2-main.cc /tmp/dbginfo/10// $ cd /tmp/dbginfo11// $ g++ -g dwarfdump-test2-helper.cc dwarfdump-test2-main.cc -o <output>12