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Date: Thu, 11 Sep 1997 12:23:40 +0200 (SAT)
From: Mark R V Murray <markm@iafrica.com>
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Subject: gnu/4511: GCC optimization broken with -m486?
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>Number:         4511
>Category:       gnu
>Synopsis:       GCC optimization broken with -m486?
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Sep 11 03:30:01 PDT 1997
>Last-Modified:
>Originator:     Mark R V Murray
>Organization:
UUNET Internet Africa
>Release:        FreeBSD 2.2-STABLE i386
>Environment:

Recent 2.2-STABLE with CFLAGS=	-O2 -m486 -pipe in /etc/make.conf

>Description:

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

foo=$((2 << 29))

>How-To-Repeat:

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

cd /dev ; ./MAKEDEV

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

>Audit-Trail:
>Unformatted: