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To: markm@iafrica.com, freebsd-bugs@freebsd.org
Subject: Re: gnu/4511: GCC optimization broken with -m486?
References: <199709111023.MAA27219@rodent.iafrica.com>
From: Peter Mutsaers <plm@xs4all.nl>
Date: 11 Sep 1997 21:07:31 +0200
In-Reply-To: Mark R V Murray's message of Thu, 11 Sep 1997 12:23:40 +0200 (SAT)
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>> On Thu, 11 Sep 1997 12:23:40 +0200 (SAT), Mark R V Murray
>> <markm@iafrica.com> said:
    >> Description:

    MRVM> We noticed this problem when sh(1) started to misbehave.
    MRVM> sh objects to a line in a script that looks like

    MRVM> foo=$((2 << 29))

    >> How-To-Repeat:

    MRVM> [make 2.2-STABLE with CFLAGS in /etc/make.conf as above]

    MRVM> cd /dev ; ./MAKEDEV

    >> Fix:
	
    MRVM> Workarounds:
    MRVM> 1) remove 1 of -O2 or -m486
    MRVM> 2) modify the offending line in the script to read
    MRVM> foo=$((2<<29))
    MRVM>    (ie remove the spaces on either side of <<)

I always build using -O2 and -m486, and my -current sh does not show
this bug.

By the way, in another follow-up Bruce Evans said that -m486 should
not be used and doesn't improve things. Is that really true? According
to gcc's man page it should improve speed for a 486, so I assumed it
will benefit a Pentium too.

-- 
 /\_/\
( o.o ) Peter Mutsaers  |  Abcoude (Utrecht), |  Trust me, I know
 ) ^ (  plm@xs4all.nl   |  the Netherlands    |  what I'm doing.