linux-kernel - Re: [PATCH v2] Makefile: add $(srctree) to dependency of compile

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Message-ID: <CAK7LNARHRjP0E-5GLJCWqyQHRURrJBgZO174thdokb5taW+qiQ@mail.gmail.com>
Date: Mon, 5 Aug 2024 15:19:55 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Alexandre Courbot <gnurou@...il.com>
Cc: Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Makefile: add $(srctree) to dependency of
 compile_commands.json target

On Sun, Aug 4, 2024 at 2:51 PM Alexandre Courbot <gnurou@...il.com> wrote:
>
> When trying to build the compile_commands.json target from an external
> module's directory, the following error is displayed:


As I mentioned in v1, this issue only happens when using the kernel
directory built in a separate output directory (O=).

Unless you have a opposition, I will reword this sentence as follows:

When trying to build compile_commands.json for an external module
against the kernel built in a separate output directory, the following
error is displayed:






>
>         make[1]: *** No rule to make target 'scripts/clang-tools/gen_compile_commands.py',
>         needed by 'compile_commands.json'. Stop.
>
> This is because gen_compile_commands.py was previously looked up using a
> relative path to $(srctree), but commit b1992c3772e6 ("kbuild: use
> $(src) instead of $(srctree)/$(src) for source directory") stopped
> defining VPATH for external module builds.
>
> Prefixing gen_compile_commands.py with $(srctree) fixes the problem.
>
> Fixes: b1992c3772e6 ("kbuild: use $(src) instead of $(srctree)/$(src) for source directory")
> Signed-off-by: Alexandre Courbot <gnurou@...il.com>
> ---
>  Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/Makefile b/Makefile
> index 8ad55d6e7b60..52d7dfe4212a 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1980,7 +1980,7 @@ nsdeps: modules
>  quiet_cmd_gen_compile_commands = GEN     $@
>        cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
>
> -$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
> +$(extmod_prefix)compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \
>         $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
>         $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
>         $(call if_changed,gen_compile_commands)
> --
> 2.46.0
>
>


-- 
Best Regards
Masahiro Yamada