lldb/test/API/lang/cpp/extern_c/main.cpp

#include <stdio.h>
#include <stdint.h>

extern "C"
{
   int foo();
};

int foo()
{
  puts("foo"); //% self.expect("image lookup -va $pc",
  //%                          substrs=[' name = "::foo()"',
  //%                                   ' mangled = "foo"'])
  return 2;
}

int main(int argc, char const *argv[]) {
  foo();
  return 0; //% self.expect("expression -- foo()", substrs = ['2'])
}