linux-kernel - Re: Thoughts about introducing OPTIMIZATION

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Message-ID: <568AF421.7050305@suse.cz>
Date:	Mon, 4 Jan 2016 23:37:21 +0100
From:	Michal Marek <mmarek@...e.cz>
To:	sedat.dilek@...il.com
Cc:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Arnd Bergmann <arnd@...db.de>, Ingo Molnar <mingo@...hat.com>,
	linux-kbuild@...r.kernel.org,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: Thoughts about introducing OPTIMIZATION_CFLAG

Dne 4.1.2016 v 12:47 Sedat Dilek napsal(a):
> But I think you did not get my problem - to have two different
> optimization-levels for a compiler in *one* make-line makes no sense
> to me.

That we sometimes have -O2 ... -Os on the command line is not a problem,
since any same unix tool parses its options so that the last one of
mutually exclusive options wins. As to -Os vs. -Oz, to my knowledge
clang accepts both and -Oz means to reduce size by any means. If -Oz is
more appropriate for the CONFIG_CC_OPTIMIZE_FOR_SIZE case and/or for the
individual object files, feel free to change it, but please do not
introduce another variable holding compiler options.

Michal
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