From mboxrd@z Thu Jan  1 00:00:00 1970
To: 9fans@cse.psu.edu
From: Ralph Corderoy <ralph@inputplus.demon.co.uk>
Message-ID: <a5llu8$gq9$1@inputplus.demon.co.uk>
References: <65cb447dbaf5f9da39d670e4f0596c79@plan9.bell-labs.com>
Subject: Re: [9fans] GUI toolkit for Plan 9
Date: Thu, 28 Feb 2002 16:35:10 +0000
Topicbox-Message-UUID: 5c30ea06-eaca-11e9-9e20-41e7f4b1d025

Hi Dave,

> I heard a rumor yesterday that I'ld like dispelled if possible.  It
> was that the Linux kernel had to be compiled with optimization turned
> on to work.

AIUI that's correct.  gcc only inlines requested functions if -O, or
-O2, etc., has been given.  If there's no `fall back' implementation of
a requested-to-be-inlined function provided then you end up with an
undefined reference, i.e. function foo doesn't exist anywhere.  Linux
puts many such `inline' functions in headers files in place of
pre-processor macros.

    http://gcc.gnu.org/onlinedocs/gcc-3.0.3/gcc_5.html#SEC102

The norm is to -O2 the Linux kernel.

Cheers,


Ralph.