Sender: nate AT cartsys DOT com
Message-ID: <35849B71.3C9D0204@cartsys.com>
Date: Sun, 14 Jun 1998 20:56:33 -0700
From: Nate Eldredge <nate AT cartsys DOT com>
MIME-Version: 1.0
To: Ben <oats AT bright DOT net>
CC: djgpp AT delorie DOT com
Subject: Re: compiling problem
References: <01bd97ea$1e200bc0$4c0f8fd1 AT gcsyqfqj>
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Ben wrote:
> 
> When I try to compile using Rhide it gives me this error message:
> Error: c:/djgpp/bin/ld.exe: cannot open -lstdcx: No such file or directory
> (ENOENT)
> 
> I really don't understand why it can find something (I downloaded all the
> files I should have).
> Can someone help?

Read the file c:\djgpp\gnu\gcc-2.81\problems.txt.
-- 

Nate Eldredge
nate AT cartsys DOT com

-----------------------------------------
> 
> with
> 
> --[test.c]--------------------------------------------------
> extern int My_function();
> 
> void main()
> {
>   printf("Result=%d\n", My_function());
>   return;
> }
> ------------------------------------------------------------
> 
> it compiles ok. But if I change file name from test.c to objective
> test.cc it doesn't. It says "Undefined reference to My_function(void)"

That's because in C++, the compiler mangles names in order to be able to
distinguish between `void foo(int)' and `void foo(double)', and so
forth.  Your assembler name is not mangled, so it doesn't get found. 
Declare your asm function as extern "C" in the C++ source, and
everything will be fine.

Btw, `main' has to return `int'.

> 2. When I write:
> 
> --[file.asm]------------------------------------------------
> [BITS 32]
> [GLOBAL _My_function__FUi]
> [SECTION .text]
> 
> _My_function__FUi:
>         mov     ax, 1010
>         ret
> ------------------------------------------------------------
> 
> with
> 
> --[test.c]--------------------------------------------------
> extern int My_function(unsigned int);
> 
> void main()
> {
>   printf("Result=%d\n", My_function(23));
>   return;
> }
> ------------------------------------------------------------
> 
> it says "Undefined reference to My_function". Why?
> Please help me.

Opposite side of the same coin, as above.  The C compiler does not
mangle names, so if you try to do it, it will just get confused.

Summary: Declare your assembly functions with normal names, and declare
them extern "C" if you want to access them from C++.
-- 

Nate Eldredge
nate AT cartsys DOT com