On Wed, Mar 27, 2024 at 05:17:21PM +0000, Ian Abbott wrote:
> I'm getting this error when trying to build a kernel that has "Kernel
> hacking > Compile-time checks and compiler options > Generate BTF typeinfo
> (DEBUG_INFO_BTF)" enabled in the configuration:
>
> --------------------------------------------------------------------
> ----------------------
> target: kernel.compile
> ----------------------
>
> make: Entering directory
> '/mnt/lindata/work/abbotti/ptxdist/projects/its-ipt4-demo/platform-its-ipt4-demo/build-target/linux-6.6.21'
> make[1]: Entering directory
> '/mnt/lindata/work/abbotti/ptxdist/projects/its-ipt4-demo/platform-its-ipt4-demo/build-target/linux-6.6.21-build'
> GEN Makefile
> DESCEND bpf/resolve_btfids
> CALL
> /mnt/lindata/work/abbotti/ptxdist/projects/its-ipt4-demo/platform-its-ipt4-demo/build-target/linux-6.6.21/scripts/checksyscalls.sh
> GEN
> /mnt/lindata/work/abbotti/ptxdist/projects/its-ipt4-demo/platform-its-ipt4-demo/build-target/linux-6.6.21-build/tools/bpf/resolve_btfids/libbpf/bpf_helper_defs.h
> INSTALL libsubcmd_headers
>
> 'kernel' must depend on 'host-system-python3' for 'python3'!
>
> make[5]: *** [Makefile:160:
> /mnt/lindata/work/abbotti/ptxdist/projects/its-ipt4-demo/platform-its-ipt4-demo/build-target/linux-6.6.21-build/tools/bpf/resolve_btfids/libbpf/bpf_helper_defs.h]
> Error 1
> make[5]: *** Deleting file
> '/mnt/lindata/work/abbotti/ptxdist/projects/its-ipt4-demo/platform-its-ipt4-demo/build-target/linux-6.6.21-build/tools/bpf/resolve_btfids/libbpf/bpf_helper_defs.h'
> make[4]: *** [Makefile:63:
> /mnt/lindata/work/abbotti/ptxdist/projects/its-ipt4-demo/platform-its-ipt4-demo/build-target/linux-6.6.21-build/tools/bpf/resolve_btfids//libbpf/libbpf.a]
> Error 2
> make[4]: *** Waiting for unfinished jobs....
> make[3]: *** [Makefile:76: bpf/resolve_btfids] Error 2
> make[2]: ***
> [/mnt/lindata/work/abbotti/ptxdist/projects/its-ipt4-demo/platform-its-ipt4-demo/build-target/linux-6.6.21/Makefile:1355:
> tools/bpf/resolve_btfids] Error 2
> make[1]: ***
> [/mnt/lindata/work/abbotti/ptxdist/projects/its-ipt4-demo/platform-its-ipt4-demo/build-target/linux-6.6.21/Makefile:234:
> __sub-make] Error 2
> make[1]: Leaving directory
> '/mnt/lindata/work/abbotti/ptxdist/projects/its-ipt4-demo/platform-its-ipt4-demo/build-target/linux-6.6.21-build'
> make: *** [Makefile:234: __sub-make] Error 2
> make: Leaving directory
> '/mnt/lindata/work/abbotti/ptxdist/projects/its-ipt4-demo/platform-its-ipt4-demo/build-target/linux-6.6.21'
> make: ***
> [/mnt/lindata/work/abbotti/ptxdist/ptxdist/ptxdist_git/ptxdist/rules/kernel.make:251:
>
> /home/abbotti/work/ptxdist/projects/its-ipt4-demo/platform-its-ipt4-demo/state/kernel.compile]
> Error 2
> --------------------------------------------------------------------
>
> I could live without it. It is required for RestrictFileSystems= in systemd
> service units according to
> <https://github.com/systemd/systemd/blob/main/README>. But is there an easy
> fix?
Put this in "platforms/kernel.fixup.in" in your BSP:
------------------------------->8----------------------------
## SECTION=base_kernel
config KERNEL
select HOST_SYSTEM_PYTHON3
------------------------------->8----------------------------
> I'm currently using ptxdist 2024.03.0 but is also reproducible on the
> ptxdist master branch.
We should add that dependency Upstream as well. Something like
config KERNEL_PYTHON3
prompt "ensure Python3 is available"
bool
help
Python3 is needed at build-time when CONFIG_DEBUG_INFO_BTF is
enabled.
Michael
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