From: Krzysztof Kozlowski <krzk@kernel.org>
To: Masahiro Yamada <masahiroy@kernel.org>, linux-kbuild@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, Nicolas Schier <nicolas@fjasle.eu>,
Conor Dooley <conor@kernel.org>, Rob Herring <robh@kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
Subject: Re: [PATCH v2 4/4] kbuild: use $(src) instead of $(srctree)/$(src) for source directory
Date: Thu, 9 May 2024 10:59:32 +0200 [thread overview]
Message-ID: <ea24aa9b-291d-47bc-98cf-5893926ff8da@kernel.org> (raw)
In-Reply-To: <20240427145502.2804311-5-masahiroy@kernel.org>
On 27/04/2024 16:55, Masahiro Yamada wrote:
> Kbuild conventionally uses $(obj)/ for generated files, and $(src)/ for
> checked-in source files. It is merely a convention without any functional
> difference. In fact, $(obj) and $(src) are exactly the same, as defined
> in scripts/Makefile.build:
>
> src := $(obj)
>
> When the kernel is built in a separate output directory, $(src) does
> not accurately reflect the source directory location. While Kbuild
> resolves this discrepancy by specifying VPATH=$(srctree) to search for
> source files, it does not cover all cases. For example, when adding a
> header search path for local headers, -I$(srctree)/$(src) is typically
> passed to the compiler.
>
> This introduces inconsistency between upstream and downstream Makefiles
> because $(src) is used instead of $(srctree)/$(src) for the latter.
>
> To address this inconsistency, this commit changes the semantics of
> $(src) so that it always points to the directory in the source tree.
>
> Going forward, the variables used in Makefiles will have the following
> meanings:
>
> $(obj) - directory in the object tree
> $(src) - directory in the source tree (changed by this commit)
> $(objtree) - the top of the kernel object tree
> $(srctree) - the top of the kernel source tree
>
> Consequently, $(srctree)/$(src) in upstream Makefiles need to be replaced
> with $(src).
>
This patch, since yesterday's next, causes build issues with my
(completely) standard and typical workflow:
alias crosc64='CROSS_COMPILE="ccache aarch64-linux-gnu-" ARCH=arm64 KBUILD_OUTPUT=out/'
crosc64 make defconfig
crosc64 make dt_binding_check
Errors:
No rule to make target 'Documentation/devicetree/bindings/i3c/snps,dw-i3c-master.example.dtb', needed by 'dt_binding_check'. Stop.
Please revert/drop from next.
Best regards,
Krzysztof
next parent reply other threads:[~2024-05-09 8:59 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20240427145502.2804311-1-masahiroy@kernel.org>
[not found] ` <20240427145502.2804311-5-masahiroy@kernel.org>
2024-05-09 8:59 ` Krzysztof Kozlowski [this message]
2024-05-09 19:36 ` [PATCH v2 4/4] kbuild: use $(src) instead of $(srctree)/$(src) for source directory Masahiro Yamada
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=ea24aa9b-291d-47bc-98cf-5893926ff8da@kernel.org \
--to=krzk@kernel.org \
--cc=conor@kernel.org \
--cc=devicetree@vger.kernel.org \
--cc=linux-kbuild@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=masahiroy@kernel.org \
--cc=nicolas@fjasle.eu \
--cc=robh@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).