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Date: Thu, 5 May 2011 16:10:04 +0200
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From: Olivier Smedts <olivier@gid0.org>
To: Roman Divacky <rdivacky@freebsd.org>
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Cc: current@freebsd.org
Subject: Re: Clang error make buildworld
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2011/5/5 Roman Divacky <rdivacky@freebsd.org>:
>> Because with clang, -march=3Dnative often breaks buildworld, while
>> -march=3Dcore2 is ok.
>
> Can you be more specific about this claim? On what CPU are seeing
> this breakage?

On a Core2 Quad Q9450 and a Core i7 860.
I use "core2" on both because that's the most approaching values
supported in bsd.cpu.mk and gcc in HEAD.
I reverted from "-march=3Dnative" to "-march=3Dcore2" for two reasons, the
first beeing that gcc didn't use the right "-mtune" when using
"-march=3Dnative" (I think it was using internally "-mtune=3Dgeneric").
I'll try to be more specific if I can find the tests I was using at
that time. The second reason is that with "-march=3Dnative", my
buildworld often failed with clang, and since I use "-march=3Dcore2" I
had no issues. I'll try to buildworld with "-march=3Dnative" and report
back.

> Anyway, can you compile and run on that machine this:
>
> =A0 =A0 =A0 =A0http://lev.vlakno.cz/~rdivacky/Host.cpp

Compiled with gcc and clang, both output (on one of the two computers
I use most) :
roman =3D corei7

> It's the LLVM CPU autodetection code, it will print the name of
> your CPU. I wonder whats the difference to "core2".
>
> Thank you. roman

Cheers

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