linux-kernel - Fail to build Linux with O= in master

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Message-ID: <cc4680bb-9e54-d449-606e-a3fa2e7a9763@arm.com>
Date:   Sat, 30 Sep 2017 00:59:47 +0100
From:   Julien Grall <julien.grall@....com>
To:     yamada.masahiro@...ionext.com
Cc:     mmarek@...e.com, linux-kbuild@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Fail to build Linux with O= in master

Hello,

I have tried to build the latest master and got the following error:

42sh> make O=~/works/linux-build/aarch64-4k -C ~/works/linux                                                                                                     
make: Entering directory '/home/julgra01/works/linux'
Makefile:135: *** failed to create output directory "~/works/linux-build/aarch64-4k".  Stop.
make: Leaving directory '/home/julgra01/works/linux'

The bisector found the commit 8e9b466 "kbuild: use $(abspath ...)
instead of $(shell cd ... && /bin/pwd)".

Looking at the code, it seems that it is because the code is
now using $(realpath ...). Indeed when I replace ~ by $HOME
the kernel is now built.

I am not a Makefile expert, so I would appreciate if anyone
could suggest a patch for this.

Regards,

-- 
Julien Grall