From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Williams <steve@icarus.icarus.com>
To: Chris Howard <choward@intellistor.com>
Cc: c++-embedded@cygnus.com, crossgcc@cygnus.com
Subject: Re: gcc vs g++ and linking with as 
Date: Thu, 25 Jun 1998 23:03:00 -0000
Message-id: <199806260603.XAA24037@icarus.icarus.com>
References: <35926CEF.9F0E576F@intellistor.com>
X-SW-Source: 1998/msg00008.html

choward@intellistor.com said:
> Compiling with as,gcc and linking with ld works fine. Compiling with
> as,g++ and linking with ld does not work,
>   undefined symbols for those things written in assembler.

Even in C you can have troubles. What I do is use the "asm" attribute
to declare external variables, i.e.:

	extern unsigned char __index_space asm("__index_space__");

which causes __index_space__ to be the actual symbol name at link time.
A function would work like this:

	int foo(int i) asm("test_symbol");

	int foo(int i)
	{
	        return i+1;
	}

This works with (GNU) C and C++. It is a good thing to do even with C
because sometimes you get the leasing _, sometimes you don't. etc.
-- 
Steve Williams                "The woods are lovely, dark and deep.
steve@icarus.com              But I have promises to keep,
steve@picturel.com            and lines to code before I sleep,
http://www.picturel.com       And lines to code before I sleep."