meson: bpf: propagate 'sysroot' during cross compilation #33427
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During cross-compilation of systemd, the compiler used to build the bpf's needs
to be pointed at the correct include searchpath. Which can be done by passing
the corresponding directory in through the cflags; for example in yocto/bitbake
this would work: CFLAGS += "--sysroot=${STAGING_DIR_TARGET}"
Signed-off-by: Johannes Schneider <johannes.schneider@leica-geosystems.com>
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To be able to use
resource-controlfeatures like RestrictNetworkInterfaces= a set of corresponding eBPFs need to be compiled.When targeting an embedded platform, dependencies like
libbpf(and thebpftool) are compiled separately and place their headers/libraries into a common sysroot which the cross-compiler used to build target binaries - including systemd - usually knows.But during cross-compilation of systemd, the compiler used to build the eBPF's is a different one ('clang-native' or a gcc: bpf-unknown-none ), and needs to be pointed at the correct include search-path, where the libbpf headers reside.
This can be done by passing the corresponding directory in through the cflags; for example in yocto/bitbake this would work:
CFLAGS += "--sysroot=${STAGING_DIR_TARGET}", and havemeson.build"propagate" this setting to the eBPF compiler.related open-embedded submissions:
https://lists.openembedded.org/g/openembedded-core/message/200948
https://lists.openembedded.org/g/openembedded-core/message/200949