From owner-freebsd-current  Thu Jul 22 21:26:37 1999
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Date: Fri, 23 Jul 1999 14:24:29 +1000
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199907230424.OAA01541@godzilla.zeta.org.au>
To: green@FreeBSD.ORG, schuerge@wjpserver.CS.Uni-SB.DE
Subject: Re: Still kernel compilation failures
Cc: freebsd-current@FreeBSD.ORG
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>> > Put -O back in the COPTFLAGS.
>> 
>> It works now. Is there any explaination why -O is required? :)
>
>Noone compiles without -O, so(/and) it's not supported. My take is

It is supported, but someone broke it.

>that EGCS says "Hey, I am in optimization level foobar! I can optimize
>for unused code. Hmm... that's unused, so...". Either that or its
>debugging support is really uNFed up.

-O works because optimisation removes an unused reference to a nonexistent
variable.  The variable once existed and was used.  It still exists under
a different name.

Bruce


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