Re: Linking a shared library into libbackend.a?

[Guy Montag <theguymontag at yahoo dot com>]

--- Guy Montag <theguymontag@yahoo.com> wrote:
> 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++
> 

Problem solved. The LIBS variable appears to be well
situated to add in a .lhook flag to compile in the
shared library. I recompiled G++ with the change and
it works.







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