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From: Hagen Paul Pfeifer <hagen@jauu.net>
To: Renato Westphal <renatowestphal@gmail.com>
Cc: Zhihua Che <zhihua.che@gmail.com>,
	Randy Dunlap <rdunlap@xenotime.net>,
	linux-kernel@vger.kernel.org,
	Arnaldo Carvalho de Melo <acme@redhat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Subject: Re: How can I turn off/disable -O2/-Os optimization?
Date: Sun, 6 May 2012 15:28:27 +0200	[thread overview]
Message-ID: <20120506132827.GB3824@nuttenaction> (raw)
In-Reply-To: <CAChaegmgw_8KsmOAt=WpHN6KTa9qkgh-EmHC-PGqCQxGRQ2U6w@mail.gmail.com>

* Renato Westphal | 2012-05-05 23:00:48 [-0300]:

>>> You could try the new CONFIG_READABLE_ASM patch:
>>>  http://marc.info/?l=linux-kernel&m=133296079716268&w=2

Maybe remove "-Os" on a global basis is not wanted nor required. Maybe a per
directory, per file or per function basis may superior!

make DISABLE_OPTIMIZATION=net/sched/sch_api.c

But still all core constructs defined in top level header files must be
compatible for directory/file basis to be build with no optimization at all.

One way to un-optmize fine-granular is GCC's optmize pragma [1].

Hagen

PS: such a functionality may be convenient for perf probe too! (to hook into
probepoints which are currently optimized out)


[1] http://gcc.gnu.org/onlinedocs/gcc/Function-Specific-Option-Pragmas.html

      reply	other threads:[~2012-05-06 13:38 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-01 16:31 How can I turn off/disable -O2/-Os optimization? Zhihua Che
2012-04-01 16:49 ` Randy Dunlap
2012-04-02  8:44   ` Zhihua Che
2012-05-06  2:00     ` Renato Westphal
2012-05-06 13:28       ` Hagen Paul Pfeifer [this message]

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