From: Steven Rostedt <rostedt@goodmis.org>
To: Trond Myklebust <trondmy@primarydata.com>
Cc: "linux-kselftest@vger.kernel.org"
<linux-kselftest@vger.kernel.org>,
"elfring@users.sourceforge.net" <elfring@users.sourceforge.net>,
"linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
"kernel-janitors@vger.kernel.org"
<kernel-janitors@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"peterz@infradead.org" <peterz@infradead.org>
Subject: Re: Difficulties for compilation without extra optimisation
Date: Sun, 3 Dec 2017 16:22:56 -0500 [thread overview]
Message-ID: <20171203162256.4ea0750d@vmware.local.home> (raw)
In-Reply-To: <1512314250.3673.6.camel@primarydata.com>
On Sun, 3 Dec 2017 15:17:32 +0000
Trond Myklebust <trondmy@primarydata.com> wrote:
> > I would like to check corresponding build results then without extra
> > optimisation applied by the compiler.
> > But I got surprised by error messages for a command like the
> > following.
> >
> > elfring@Sonne:~/Projekte/Linux/next-patched> my_cc=/usr/bin/gcc-7 &&
> > LANG=C make -j4 CC="${my_cc}" HOSTCC="${my_cc}" EXTRA_CFLAGS='-O0'
> > allmodconfig fs/nfs/write.o
Why would you compile the kernel without optimization? There's many
places in the kernel that WILL NOT BUILD without optimization. In fact,
we do a lot of tricks to make sure that things work the way we expect
it to, because we add broken code that only gets compiled out when gcc
optimizes the code the way we expect it to be, and the kernel build
will break otherwise.
-- Steve
next prev parent reply other threads:[~2017-12-03 21:23 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-07 16:53 [PATCH RFC v1] nfs/write: Use common error handling code in nfs_lock_and_join_requests() SF Markus Elfring
2017-12-03 14:15 ` Difficulties for compilation without extra optimisation SF Markus Elfring
2017-12-03 15:17 ` Trond Myklebust
2017-12-03 21:22 ` Steven Rostedt [this message]
2017-12-03 21:56 ` SF Markus Elfring
2017-12-04 2:40 ` Steven Rostedt
2017-12-04 9:55 ` SF Markus Elfring
2017-12-04 9:00 ` SF Markus Elfring
2017-12-04 9:48 ` Steven Rostedt
2017-12-04 10:18 ` SF Markus Elfring
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20171203162256.4ea0750d@vmware.local.home \
--to=rostedt@goodmis.org \
--cc=elfring@users.sourceforge.net \
--cc=kernel-janitors@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-kselftest@vger.kernel.org \
--cc=linux-nfs@vger.kernel.org \
--cc=peterz@infradead.org \
--cc=trondmy@primarydata.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox