linux-kernel - Re: [PATCH v2] selftests: uevent: use shared makefile library

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Date: Thu, 21 Dec 2023 14:44:52 -0700
From: Shuah Khan <skhan@...uxfoundation.org>
To: Antonio Terceiro <antonio.terceiro@...aro.org>,
 Shuah Khan <shuah@...nel.org>
Cc: linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
 Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v2] selftests: uevent: use shared makefile library

On 12/21/23 13:49, Antonio Terceiro wrote:
> This makes the uevent selftests build not write to the source tree
> unconditionally, as that breaks out of tree builds when the source tree
> is read-only. It also avoids leaving a git repository in a dirty state
> after a build.
> 

Why can't you do that using make O= directive.

> v2: drop spurious extra SPDX-License-Identifier
> 
> Signed-off-by: Antonio Terceiro <antonio.terceiro@...aro.org>
> ---
>   tools/testing/selftests/uevent/Makefile | 15 +++------------
>   1 file changed, 3 insertions(+), 12 deletions(-)
> 
> diff --git a/tools/testing/selftests/uevent/Makefile b/tools/testing/selftests/uevent/Makefile
> index f7baa9aa2932..872969f42694 100644
> --- a/tools/testing/selftests/uevent/Makefile
> +++ b/tools/testing/selftests/uevent/Makefile
> @@ -1,17 +1,8 @@
>   # SPDX-License-Identifier: GPL-2.0
>   all:
>   
> -include ../lib.mk
> -
> -.PHONY: all clean
> -
> -BINARIES := uevent_filtering
> -CFLAGS += -Wl,-no-as-needed -Wall
> +CFLAGS += -Wl,-no-as-needed -Wall $(KHDR_INCLUDES)
>   
> -uevent_filtering: uevent_filtering.c ../kselftest.h ../kselftest_harness.h
> -	$(CC) $(CFLAGS) $< -o $@
> +TEST_GEN_PROGS = uevent_filtering
>   
> -TEST_PROGS += $(BINARIES)
> -EXTRA_CLEAN := $(BINARIES)
> -
> -all: $(BINARIES)
> +include ../lib.mk

This change doesn't get the intended result of not writing to
source tree. Binaries will still be written to the source
tree unless O= is specified.

thanks,
-- Shuah