linux-kernel - Re: Embedded white space in out-of-tree module full pathname

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Message-ID: <20150127223922.GQ26493@n2100.arm.linux.org.uk>
Date:	Tue, 27 Jan 2015 22:39:22 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Mason <mpeg.blue@...e.fr>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: Embedded white space in out-of-tree module full pathname

On Tue, Jan 27, 2015 at 10:44:41AM +0100, Mason wrote:
> I'd like some confirmation that this is either not supported, or that
> I'm doing something obviously wrong. (Kernel 3.14 if it matters.)

It's something which isn't going to be supported.

Various things in the make makes it difficult - for example:

module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))

and as per your example, addprefix will see "/tmp/foo" and "bar/module"
as two separate words.  make has no way to know that these are one
path rather than two separate paths.

See the addprefix documentation in make's info pages, which splits the
second argument by whitespace.

Unlike shell, where you have IFS= which can change the word splitting,
make always uses white space.

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