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Buildroot added the bpftrace package in 2024 with commit338acb27ffwhich initially provided version 0.19.1. This release includes upstream commitfea3193989which was added to version 0.17.0 in 2022 and makes use of certain variables of struct bpf_btf_info which were added to the linux kernel in 2020 with version 5.11:5329722057+ __aligned_u64 name; + __u32 name_len; + __u32 kernel_btf; The libbpf package updates toolchain headers with its bundled version only when the toolchain headers are version 5.8 or older, this condition is part of the initial version of the package added in 2020 with buildroot commitf7b8508e4f. This version limit should have been raised when the bpftrace package was added to avoid build errors when the toolchain contains header versions 5.9 or 5.10. This situation caused build errors in the autobuilder, the last one in February 2025: /home/autobuild/autobuild/instance-18/output-1/build/bpftrace-0.19.1/src/bpffeature.cpp: In member function 'bool bpftrace::BPFfeature::has_module_btf()': /home/autobuild/autobuild/instance-18/output-1/build/bpftrace-0.19.1/src/bpffeature.cpp:573:8: error: 'struct bpf_btf_info' has no member named 'name' 573 | info.name = (__u64)name; | ^~~~ /home/autobuild/autobuild/instance-18/output-1/build/bpftrace-0.19.1/src/bpffeature.cpp:574:8: error: 'struct bpf_btf_info' has no member named 'name_len' 574 | info.name_len = sizeof(name); The problem disappeared from the autobuilders due to newer headers versions used for the buildroot toolchain or other build errors occurring earlier, like llvm version mismatches. The build error can today still be reproduced with this defconfig BR2_aarch64=y BR2_KERNEL_HEADERS_5_10=y BR2_TOOLCHAIN_BUILDROOT_CXX=y BR2_PER_PACKAGE_DIRECTORIES=y BR2_PACKAGE_BPFTRACE=y on the 2026.02.x branch as of0be927b89a. To fix the problem we raise the BR2_TOOLCHAIN_HEADERS_AT_LEAST_ version number. Fixes: https://autobuild.buildroot.net/results/dbe/dbecf88c7edba357cee8fea31294ddb9f4d188ad/ https://autobuild.buildroot.net/results/df5/df59e038de47f63d14e1be7bd12dd16a69636f79/ https://autobuild.buildroot.net/results/359/3595d39dd53a686bbf996dd4e532ced44906b9e3/ https://autobuild.buildroot.net/results/e4f/e4f95a5f30a605eadb81802075ea6bb1e2880684/ https://autobuild.buildroot.net/results/bd0/bd075cb8c55f9f8a017711dc804b8d81ae89b4c5/ Signed-off-by: Bernd Kuhls <bernd@kuhls.net> Signed-off-by: Arnout Vandecappelle <arnout@rnout.be> (cherry picked from commit7e5241e14a) Signed-off-by: Thomas Perale <thomas.perale@mind.be>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at https://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches