linux-kernel - Re: [PATCH] kbuild: Use $(obj)/%.cc to fix host C++ module builds

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Message-ID: <CAK7LNARej5AOyxFzRoZa3VKmJcEhbQYpx6h6rim9t+uVNaPOyw@mail.gmail.com>
Date: Tue, 25 Jun 2024 23:05:12 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Nicolas Schier <n.schier@....de>
Cc: Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Rolf Eike Beer <eb@...ix.com>
Subject: Re: [PATCH] kbuild: Use $(obj)/%.cc to fix host C++ module builds

On Mon, Jun 24, 2024 at 8:12 PM Nicolas Schier <n.schier@....de> wrote:
>
> Use $(obj)/ instead of $(src)/ prefix when building C++ modules for
> host, as explained in commit b1992c3772e6 ("kbuild: use $(src) instead
> of $(srctree)/$(src) for source directory").  This fixes build failures
> of 'xconfig':
>
>     $ make O=build/ xconfig
>     make[1]: Entering directory '/data/linux/kbuild-review/build'
>       GEN     Makefile
>     make[3]: *** No rule to make target '../scripts/kconfig/qconf-moc.cc', needed by 'scripts/kconfig/qconf-moc.o'.  Stop.
>
> Fixes: b1992c3772e6 ("kbuild: use $(src) instead of $(srctree)/$(src) for source directory")
> Reported-by: Rolf Eike Beer <eb@...ix.com>
> Signed-off-by: Nicolas Schier <n.schier@....de>

Applied to linux-kbuild.
Thanks!



> ---
>  scripts/Makefile.host | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/Makefile.host b/scripts/Makefile.host
> index d35f55e0d141..e85be7721a48 100644
> --- a/scripts/Makefile.host
> +++ b/scripts/Makefile.host
> @@ -146,7 +146,7 @@ $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
>  # Create .o file from a single .cc (C++) file
>  quiet_cmd_host-cxxobjs = HOSTCXX $@
>        cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
> -$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
> +$(host-cxxobjs): $(obj)/%.o: $(obj)/%.cc FORCE
>         $(call if_changed_dep,host-cxxobjs)
>
>  # Create executable from a single Rust crate (which may consist of
>
> ---
> base-commit: 224a21441b0925ce1e60afb27629773a522c946e
> change-id: 20240624-kbuild-fix-xconfig-f0e95d0d5b27
>
> Best regards,
> --
> Nicolas Schier
>


-- 
Best Regards
Masahiro Yamada