2024-12-04 13:36 UTC-0800 ~ Namhyung Kim <namhyung@xxxxxxxxxx> > Hi Leo, > > On Wed, Dec 04, 2024 at 09:30:59PM +0000, Leo Yan wrote: >> When building perf with static linkage: >> >> make O=/build LDFLAGS="-static" -C tools/perf VF=1 DEBUG=1 >> ... >> LINK /build/util/bpf_skel/.tmp/bootstrap/bpftool >> /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/13/../../../x86_64-linux-gnu/libelf.a(elf_compress.o): in function `__libelf_compress': >> (.text+0x113): undefined reference to `ZSTD_createCCtx' >> /usr/bin/ld: (.text+0x2a9): undefined reference to `ZSTD_compressStream2' >> /usr/bin/ld: (.text+0x2b4): undefined reference to `ZSTD_isError' >> /usr/bin/ld: (.text+0x2db): undefined reference to `ZSTD_freeCCtx' >> /usr/bin/ld: (.text+0x5a0): undefined reference to `ZSTD_compressStream2' >> /usr/bin/ld: (.text+0x5ab): undefined reference to `ZSTD_isError' >> /usr/bin/ld: (.text+0x6b9): undefined reference to `ZSTD_freeCCtx' >> /usr/bin/ld: (.text+0x835): undefined reference to `ZSTD_freeCCtx' >> /usr/bin/ld: (.text+0x86f): undefined reference to `ZSTD_freeCCtx' >> /usr/bin/ld: (.text+0x91b): undefined reference to `ZSTD_freeCCtx' >> /usr/bin/ld: (.text+0xa12): undefined reference to `ZSTD_freeCCtx' >> /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/13/../../../x86_64-linux-gnu/libelf.a(elf_compress.o): in function `__libelf_decompress': >> (.text+0xbfc): undefined reference to `ZSTD_decompress' >> /usr/bin/ld: (.text+0xc04): undefined reference to `ZSTD_isError' >> /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/13/../../../x86_64-linux-gnu/libelf.a(elf_compress.o): in function `__libelf_decompress_elf': >> (.text+0xd45): undefined reference to `ZSTD_decompress' >> /usr/bin/ld: (.text+0xd4d): undefined reference to `ZSTD_isError' >> collect2: error: ld returned 1 exit status >> >> Building bpftool with static linkage also fails with the same errors: >> >> make O=/build -C tools/bpf/bpftool/ V=1 >> >> To fix the issue, explicitly link libzstd. > > I was about to report exactly the same. :) Thank you both. This has been reported before [0] but I didn't find the time to look into a proper fix. The tricky part is that static linkage works well without libzstd for older versions of elfutils [1], but newer versions now require this library. Which means that we don't want to link against libzstd unconditionally, or users trying to build bpftool may have to install unnecessary dependencies. Instead we should add a new probe under tools/build/feature (Note that we already have several combinations in there, libbfd, libbfd-liberty, libbfd-liberty-z, and I'm not sure what's the best approach in terms of new combinations). Thanks, Quentin [0] https://github.com/libbpf/bpftool/issues/152 [1] https://github.com/libbpf/bpftool/issues/152#issuecomment-2343131810
