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gcc 4.3.0 i386 default question
- From: Joel Sherrill <joel dot sherrill at oarcorp dot com>
- To: GCC List <gcc at gcc dot gnu dot org>
- Date: Wed, 12 Mar 2008 10:23:58 -0500
- Subject: gcc 4.3.0 i386 default question
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@OARcorp.com On-Line Applications Research
Ask me about RTEMS: a free RTOS Huntsville AL 35805
Support Available (256) 722-9985