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Ihor Solodrai
b0dcdcb9ae
The "|| echo -lzstd" default makes zstd an unconditional link
dependency of resolve_btfids. On systems where libzstd-dev is not
installed and pkg-config fails, the linker fails:
ld: cannot find -lzstd: No such file or directory
libzstd is a transitive dependency of libelf, so the -lzstd flag is
strictly necessary only for static builds [1].
Remove ZSTD_LIBS variable, and instead set LIBELF_LIBS depending on
whether the build is static or not. Use $(HOSTPKG_CONFIG) as primary
source of the flags list.
Also add a default value for HOSTPKG_CONFIG in case it's not built via
the toplevel Makefile. Pass it from selftests/bpf too.
[1] https://lore.kernel.org/bpf/[email protected]/
Reported-by: BPF CI Bot (Claude Opus 4.6) <[email protected]>
Reported-by: Vitaly Chikunov <[email protected]>
Closes: https://lore.kernel.org/bpf/[email protected]/
Fixes: 4021848a90 ("selftests/bpf: Pass through build flags to bpftool and resolve_btfids")
Signed-off-by: Ihor Solodrai <[email protected]>
Reviewed-by: Paul Chaignon <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>