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Re: [avr-gcc-list] Linking Problems with undefined reference to '__mulh

From: Joerg Wunsch
Subject: Re: [avr-gcc-list] Linking Problems with undefined reference to '__mulhi3' when using fdevopen on atmega8
Date: Mon, 6 Oct 2003 15:29:51 +0200 (MET DST)

"Peter Hierholzer" <address@hidden> wrote:

> As soon as I use fdevopen from the the avr-libc I get an unresolved
> reference to __mulhi3 for MCU = atmega8.

I'd take this as an indication that you forgot to add the
-mmcu=atmega8 option to the compiler command-line that is used when
linking the entire job.  The fdevopen() function compiled for the
ATmega8 is not supposed to call __mulhi3 (since the ATmega8 has a
hardware multiplication unit).

J"org Wunsch                                           Unix support engineer
address@hidden        http://www.interface-systems.de/~j/

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