Re: [PATCH 02/12] kbuild: add header_install dependency to scripts

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On Wed, Aug 07, 2024 at 01:09:16AM +0200, Daniel Gomez via B4 Relay wrote:
> From: Daniel Gomez <da.gomez@xxxxxxxxxxx>
> 
> Export kernel headers necessary for the tools located in scripts/. This
> ensures kernel headers are generated before building scripts/selinux.
> 
> Kernel headers required for building are: asm/types.h, asm/bitsperlong.h
> and asm/poix_types.h.
> 
> Signed-off-by: Daniel Gomez <da.gomez@xxxxxxxxxxx>
> ---
>  Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Makefile b/Makefile
> index 44c02a6f60a1..7ac079955a94 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1173,7 +1173,7 @@ include/config/kernel.release: FORCE
>  # Carefully list dependencies so we do not try to build scripts twice
>  # in parallel
>  PHONY += scripts
> -scripts: scripts_basic scripts_dtc
> +scripts: headers_install scripts_basic scripts_dtc
>  	$(Q)$(MAKE) $(build)=$(@)

Since commit 59b2bd05f5f4 ("kbuild: add 'headers' target to build up
uapi headers in usr/include", 2019-06-04), composing the user-space
header tree is separated from the actual installation to
$(INSTALL_HDR_PATH)/include.  Thus, you do not want to depend in
'headers_install' but on 'headers' instead.

Nevertheless, I am suspecting that this leads to trouble.  E.g.: if
scripts/* include $(objtree)/usr/include/asm/*.h this will probably
break cross-arch-building.

Kind regards,
Nicolas




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