How to use "nm" for "undefined reference" problem catch.

[Gengis Kanhg Toledo Ramírez]

The problem:

$ g   ./main.cc -o prueba
/home/<myname>/tmp/ccEOfejM.o(.text 0x11): In function
`main':
: undefined reference to `foo()'
collect2: ld returned 1 exit status

$ nm *.o
 
         foo.o:
00000000 T _Z3foov

main.o:
          U __gxx_personality_v0
00000000 T main
          U _Z3foov


***U = undefined, but foo() is defined by #include
"foo.h" in main.cc


$ more *.cc *.h
::::::::::::::
foo.cc
::::::::::::::
#include "foo.h"

int foo()
{
     return 42;
}
::::::::::::::
main.cc
::::::::::::::
#include "foo.h"

int main()
{
     return foo();
}
::::::::::::::
foo.h
::::::::::::::
int foo();




I realize that compiling and linking this simple
example I going to 
solve my real problem from my larger project.

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