On Wed, Oct 23, 2024 at 03:16:57AM +0900, Masahiro Yamada wrote:
> Since commit f1d87664b82a ("kbuild: cross-compile linux-headers package
> when possible"), 'make binrpm-pkg' may attempt to cross-compile the
> kernel-devel package, but it fails under certain circumstances.
>
> For example, when CONFIG_MODULE_SIG_FORMAT is enabled on openSUSE
> Tumbleweed, the following command fails:
>
> $ make ARCH=arm64 CROSS_COMPILE=aarch64-suse-linux- binrpm-pkg
> [ snip ]
> Rebuilding host programs with aarch64-suse-linux-gcc...
> HOSTCC /home/masahiro/ref/linux/rpmbuild/BUILDROOT/kernel-6.12.0_rc4-1.aarch64/usr/src/kernels/6.12.0-rc4/scripts/kallsyms
> HOSTCC /home/masahiro/ref/linux/rpmbuild/BUILDROOT/kernel-6.12.0_rc4-1.aarch64/usr/src/kernels/6.12.0-rc4/scripts/sorttable
> HOSTCC /home/masahiro/ref/linux/rpmbuild/BUILDROOT/kernel-6.12.0_rc4-1.aarch64/usr/src/kernels/6.12.0-rc4/scripts/asn1_compiler
> HOSTCC /home/masahiro/ref/linux/rpmbuild/BUILDROOT/kernel-6.12.0_rc4-1.aarch64/usr/src/kernels/6.12.0-rc4/scripts/sign-file
> /home/masahiro/ref/linux/rpmbuild/BUILDROOT/kernel-6.12.0_rc4-1.aarch64/usr/src/kernels/6.12.0-rc4/scripts/sign-file.c:25:10: fatal error: openssl/opensslv.h: No such file or directory
> 25 | #include <openssl/opensslv.h>
> | ^~~~~~~~~~~~~~~~~~~~
> compilation terminated.
>
> I believe this issue is less common on Fedora because cross-compiling
> user-space programs is not possible, even if the gcc-aarch64-linux-gnu
> package is installed. In other words, CONFIG_CC_CAN_LINK is unset.
>
> On Fedora 40, the package information explains this limitation clearly:
>
> $ dnf info gcc-aarch64-linux-gnu
> [ snip ]
> Description : Cross-build GNU C compiler.
> :
> : Only building kernels is currently supported. Support for cross-building
> : user space programs is not currently provided as that would massively multiply
> : the number of packages.
>
> This commit disables the kernel-devel package when cross-compiling
> because cross-compiling RPM packages is somewhat challenging, and I
> did not come up with a better solution.
>
> Fixes: f1d87664b82a ("kbuild: cross-compile linux-headers package when possible")
> Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Reviewed-by: Nathan Chancellor <nathan@xxxxxxxxxx>
> ---
>
> scripts/Makefile.package | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/scripts/Makefile.package b/scripts/Makefile.package
> index 11d53f240a2b..b9a4b0c8b8a0 100644
> --- a/scripts/Makefile.package
> +++ b/scripts/Makefile.package
> @@ -72,7 +72,8 @@ rpm-pkg srcrpm-pkg binrpm-pkg: rpmbuild/SPECS/kernel.spec
> --define='_topdir $(abspath rpmbuild)' \
> $(if $(filter a b, $(build-type)), \
> --target $(UTS_MACHINE)-linux --build-in-place --noprep --define='_smp_mflags %{nil}' \
> - $$(rpm -q rpm >/dev/null 2>&1 || echo --nodeps)) \
> + $$(rpm -q rpm >/dev/null 2>&1 || echo --nodeps) \
> + $(if $(cross_compiling), --without=devel)) \
> $(RPMOPTS))
>
> # deb-pkg srcdeb-pkg bindeb-pkg
> --
> 2.43.0
>
