linux-kernel - Re: [PATCH] selftests: lib.mk: fix out-of-tree builds

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Date:   Tue, 13 Jun 2023 13:16:12 +0500
From:   Muhammad Usama Anjum <usama.anjum@...labora.com>
To:     Anders Roxell <anders.roxell@...aro.org>, shuah@...nel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "open list : MEMORY MANAGEMENT" <linux-mm@...ck.org>,
        John Hubbard <jhubbard@...dia.com>
Cc:     Muhammad Usama Anjum <usama.anjum@...labora.com>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        jhubbard@...dia.com
Subject: Re: [PATCH] selftests: lib.mk: fix out-of-tree builds

This patch needs to go through mm tree as the commit which it fixes is in mm.

On 6/13/23 12:49 PM, Anders Roxell wrote:
> Since commit ("selftests: error out if kernel header files are not yet
> built") got merged, the kselftest build correctly because the
> KBUILD_OUTPUT isn't set when building out-of-tree and specifying 'O='
> This is the error message that pops up.
> 
> make --silent --keep-going --jobs=32 O=/home/anders/.cache/tuxmake/builds/1482/build INSTALL_PATH=/home/anders/.cache/tuxmake/builds/1482/build/kselftest_install ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- V=1 CROSS_COMPILE_COMPAT=arm-linux-gnueabihf- kselftest-install
> make[3]: Entering directory '/home/anders/src/kernel/next/tools/testing/selftests/alsa'
> 
> -e .[1;31merror.[0m: missing kernel header files.
> Please run this and try again:
> 
>     cd /home/anders/src/kernel/next/tools/testing/selftests/../../..
>     make headers
> 
> make[3]: Leaving directory '/home/anders/src/kernel/next/tools/testing/selftests/alsa'
> make[3]: *** [../lib.mk:77: kernel_header_files] Error 1
> 
> Fixing the issue by assigning KBUILD_OUTPUT the same way how its done in
> kselftest's Makefile. By adding 'KBUILD_OUTPUT := $(O)' 'if $(origin O)'
> is set to 'command line'. This will set the the BUILD dir to
> KBUILD_OUTPUT/kselftest when doing out-of-tree builds which makes them
> in its own separete output directory.
> 
> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
Please add fixes tag. ("selftests: error out if kernel header files are not
yet built")

Tested-by: Muhammad Usama Anjum <usama.anjum@...labora.com>

> ---
>  tools/testing/selftests/lib.mk | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
> index b8ea03b9a015..d17854285f2b 100644
> --- a/tools/testing/selftests/lib.mk
> +++ b/tools/testing/selftests/lib.mk
> @@ -44,6 +44,10 @@ endif
>  selfdir = $(realpath $(dir $(filter %/lib.mk,$(MAKEFILE_LIST))))
>  top_srcdir = $(selfdir)/../../..
>  
> +ifeq ("$(origin O)", "command line")
> +  KBUILD_OUTPUT := $(O)
> +endif
> +
>  ifneq ($(KBUILD_OUTPUT),)
>    # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
>    # expand a shell special character '~'. We use a somewhat tedious way here.

-- 
BR,
Muhammad Usama Anjum