gcc 4.3.0 i386 default question

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gcc 4.3.0 i386 default question
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Subject:	gcc 4.3.0 i386 default question
Group:	Gcc
From:	Joel Sherrill
Date:	12 Mar 2008

Hi,

Did the default i386 CPU model that gcc generates
code for change between 4.2.x and 4.3.0? I didn't
see anything in the release notes that jumps out at
me about this.

Using i386-rtems4.9 as the target, I was running
code compiled by gcc 4.3.0 on a vanilla i386 and
was getting illegal instruction exceptions. I looked
at the assembly and noticed instructions which were
not on the i386. Obviosuly, when I added -mtune=i386
and the issue went away.

This probably impacts no one on a GNU/Linux computer
since very few of those are base i386's anymore. Just
venerable embedded systems. :)

--
Joel Sherrill, Ph.D. Director of Research & Development
joel.sherrill On-Line Applications Research
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