linux-kernel - v3.16-rc4 messes up make kernelrelease with additional output

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Message-ID: <20140709125955.GS21766@n2100.arm.linux.org.uk>
Date:	Wed, 9 Jul 2014 13:59:55 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	linux-kernel@...r.kernel.org, Michal Marek <mmarek@...e.cz>,
	David Howells <dhowells@...hat.com>
Subject: v3.16-rc4 messes up make kernelrelease with additional output

3.16-rc3 and all previous versions:

$ make ARCH=arm CROSS_COMPILE=arm-linux- O=/tmp/build/ kernelrelease
3.16.0-rc3+
$

3.16-rc4:

$ make ARCH=arm CROSS_COMPILE=arm-linux- O=/tmp/build/ kernelrelease
make[1]: Entering directory `/tmp/build'
3.16.0-rc4+
$

There are tools which expect kernelrelease to only produce a single
line.  I believe c2e28dc975e (kbuild: Print the name of the build
directory) is probably responsible as this line appears on stdout.

This screws up scripts which do:

        open FH, "$build_cmd kernelrelease $O |" or die $!;
        my $kernelrelease = <FH>;
        close FH;
        chomp($kernelrelease);

or

	version=$(make O=$o kernelrelease)

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