With global NLS support enabled (CONFIG_BUILD_NLS), the linked libelf.so
and libbfd.so libraries will depend on libintl.so. Import the nls.mk helper
to set library prefixes and flags accordingly, and also conditionally add
"-lintl" as link-time library.
Fix a build error on ppc due to a EDEADLOCK redefinition in errno.h.
Use upstream stable kernel 5.8.9, and fix overriding of feature detection
to only allow/hide detected features. Also refresh existing patches.
Fixes: 2f0d672088 ("bpftools: add utility and library packages supporting
eBPF usage")
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>
Add support for building bpftool and libbpf from the latest 5.8.3 kernel
sources, ensuring up-to-date functionality and fixes. Both are written to
be backwards compatible, which simplfies build and usage across different
OpenWRT image kernels.
'bpftool' is the primary userspace tool widely used for introspection and
manipulation of eBPF programs and maps. Two variants are built: a 'full'
version which supports object disassembly and depends on libbfd/libopcodes
(total ~500KB); and a 'minimal' version without disassembly functions and
dependencies. The default 'minimal' variant is otherwise fully functional,
and both are compiled using LTO for further (~30KB) size reductions.
'libbpf' provides shared/static libraries and dev files needed for building
userspace programs that perform eBPF interaction.
Several cross-compilation and build-failure problems are addressed by new
patches and ones backported from farther upstream:
* 001-libbpf-ensure-no-local-symbols-counted-in-ABI-check.patch
* 002-libbpf-fix-build-failure-from-uninitialized-variable.patch
* 003-bpftool-allow-passing-BPFTOOL_VERSION-to-make.patch
* 004-v5.9-bpftool-use-only-ftw-for-file-tree-parsing.patch
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>
