Linking a shared library into libbackend.a?

[Guy Montag <theguymontag at yahoo dot com>]

I have written a hook directly into
rest_of_compilation in toplev.o. I would like this
hook to be present for the entire compiler proper. I
understand perfectly well how to add in an unlinked
object file, under “EXTRA_OBJS.” The challenge is that
the hook is written in C++. I have to compile and link
the object file with libstdc++, creating libhook.so.
When I add in this file into EXTRA_OBJS, the compiler
complains:

./cc1: relocation error: ./cc1: undefined symbol: hook

I am afraid that I do not yet have the knowledge to
identify why the shared library isn't working. I also
do not know where I might add in the flags “.L/.
-lhook” to directly tell GCC what to do.

Any help would be GREATLY appreciated!!!

-Guy

hook.h
int hook(void);

hook.cpp
#include <iostream>
extern "C" int hook() {...}

gcc -fpic -c hook.cpp
gcc -shared -o libhook.so hook.o -lstdc++

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