Re: [PATCH 2/3] kbuild: deb-pkg: add pkg.linux-upstream.nokernelheaders build profile

[Nicolas Schier <nicolas@fjasle.eu>]

On Wed, Oct 23, 2024 at 03:16:58AM +0900 Masahiro Yamada wrote:
> Since commit f1d87664b82a ("kbuild: cross-compile linux-headers package
> when possible"), 'make bindeb-pkg' may attempt to cross-compile the
> linux-headers package, but it fails under certain circumstances.
> 
> For example, when CONFIG_MODULE_SIG_FORMAT is enabled on Debian, the
> following command fails:
> 
>   $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- bindeb-pkg
>       [ snip ]
>   Rebuilding host programs with aarch64-linux-gnu-gcc...
>     HOSTCC  debian/linux-headers-6.12.0-rc4/usr/src/linux-headers-6.12.0-rc4/scripts/kallsyms
>     HOSTCC  debian/linux-headers-6.12.0-rc4/usr/src/linux-headers-6.12.0-rc4/scripts/sorttable
>     HOSTCC  debian/linux-headers-6.12.0-rc4/usr/src/linux-headers-6.12.0-rc4/scripts/asn1_compiler
>     HOSTCC  debian/linux-headers-6.12.0-rc4/usr/src/linux-headers-6.12.0-rc4/scripts/sign-file
>   In file included from /usr/include/openssl/opensslv.h:109,
>                    from debian/linux-headers-6.12.0-rc4/usr/src/linux-headers-6.12.0-rc4/scripts/sign-file.c:25:
>   /usr/include/openssl/macros.h:14:10: fatal error: openssl/opensslconf.h: No such file or directory
>      14 | #include <openssl/opensslconf.h>
>         |          ^~~~~~~~~~~~~~~~~~~~~~~
>   compilation terminated.
> 
> This commit adds a new profile, pkg.linux-upstream.nokernelheaders, to
> guard the linux-headers package.
> 
> There are two options to fix the above issue.
> 
> [option 1] Set the pkg.linux-upstream.nokernelheaders build profile
> 
>   $ DEB_BUILD_PROFILES=pkg.linux-upstream.nokernelheaders \
>     make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- bindeb-pkg
> 
> This skips the building of the linux-headers package.
> 
> [option 2] Install the necessary build dependencies
> 
> If you want to cross-compile the linux-headers package, you need to
> install additional packages. This is a one-time installation step.
> 
> For example, on Debian, the packages necessary for cross-compiling it
> to arm64 can be installed with the following commands:
> 
>   # dpkg --add-architecture arm64
>   # apt update
>   # apt install gcc-aarch64-linux-gnu libssl-dev:arm64
> 
> Fixes: f1d87664b82a ("kbuild: cross-compile linux-headers package when possible")
> Reported-by: Ron Economos <re@w6rz.net>
> Closes: https://lore.kernel.org/all/b3d4f49e-7ddb-29ba-0967-689232329b53@w6rz.net/
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> ---
> 
>  scripts/package/builddeb             | 2 +-
>  scripts/package/install-extmod-build | 6 ++----
>  scripts/package/mkdebian             | 9 ++++++++-
>  3 files changed, 11 insertions(+), 6 deletions(-)

Nice solution and thanks for also documenting option 2.

Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>