From: Chris Howard <choward@intellistor.com>
To: Dave Hansen <dave.hansen@btree.com>
Cc: c++-embedded@cygnus.com, crossgcc@cygnus.com
Subject: Re: gcc vs g++ and linking with as
Date: Thu, 25 Jun 1998 10:53:00 -0000 [thread overview]
Message-ID: <35928DF2.C5C09F6C@intellistor.com> (raw)
In-Reply-To: <s5923122.008@btree.com>
But none of it is C++ code. It's all C or assembler.
Shouldn't gcc and g++ compile a *.c file the same way?
Also, we have calls going both ways c-->asm() asm-->c()
Sounds like name mangling will make asm-->c++() impossible (?)
Dave Hansen wrote:
>
> This is the name mangling that g++ uses to resolve overloaded functions.
> To prevent this, declare the assembly functions as extern "C" in the
> C++ code. For example:
>
> extern "C" asm_fn();
>
> HTH. Regards,
>
> -=Dave
>
> >>> Chris Howard <choward@intellistor.com> 06/25/98 10:29AM >>>
> binutils 2.9
> gcc/g++ 2.8.0
>
> Host Sun Sparc Solaris 2.5
> Target Motorola Coldfire (-m5200) a.out object format
>
> ---
>
> Not using stdlib (-nostdlib)
>
> We have some code in assembler, and some in C.
> 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.
>
> The .o files output from g++ compilation have exported symbols that
> end in '__Fv' whereas the assembler output .o files don't have
> '__Fv' on the symbols. Is that the problem? Is there
> some way to make it work? What is __Fv?
>
> An alternative might be to put the assembly code in
> C/C++ wrapper functions. Any hints/comments that
> would be appreciated also.
>
> --
> Chris Howard Fujitsu Computer Products of America
> Longmont, Colorado
>
--
Chris Howard Fujitsu Computer Products of America
Longmont, Colorado
next parent reply other threads:[~1998-06-25 10:53 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <s5923122.008@btree.com>
1998-06-25 10:53 ` Chris Howard [this message]
1998-06-25 11:36 Gary Mussar
-- strict thread matches above, loose matches on Subject: below --
1998-06-25 11:26 Gary Mussar
1998-06-25 9:21 Dave Hansen
1998-06-25 8:32 Chris Howard
1998-06-25 20:20 ` C. M. Heard/VVNET, Inc.
1998-06-25 23:03 ` Stephen Williams
1998-06-26 0:59 ` Robert J. Brown
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