use Inline CPP to call function in so file not working

   extern "C" {
      void say_hi();
   }

   #include &lt;cstdio&gt;
   #include "say_hi.h"
   void say_hi(){
   printf("hello workd!\n");
   }

g++ -I. -fPIC -c *.cpp
g++ -shared *.o -I. -olibsay_hi.so

>perl -e 'use Inline CPP=>q{  \
 #include "say_hi.h" \
 void test(){return say_hi(); } \
 }, INC=>"-I.",LIBS=>"-lsay_hi"; test()'

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perl: symbol lookup error: /home/xxx/test_so/_Inline/lib/auto/e_8555/e_8555.so: undefined symbol: say_hi

#include "say_hi.h"
main() {
  say_hi();
}

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g++ -L. -lsay_hi test.cpp -o test

>test
hello workd!

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