Comments (8)
huang195
commented on July 16, 2024
1
OK, seems like I used brute force that did the trick, but there are nicer ways. Thanks a lot for your help on finding a workaround @qmonnet . Closing
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huang195
commented on July 16, 2024
I tried this on a debian docker image, and it still doesn't link, and I'm getting a whole bunch of errors like:
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/libbfd.a(plugin.o): in function `try_load_plugin':
/build/binutils-lybw70/binutils-2.31.1/builddir-single/bfd/../../bfd/plugin.c:228: warning: Using 'dlopen' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/libbfd.a(elf64-x86-64.o): in function `elf_x86_64_output_arch_local_syms':
/build/binutils-lybw70/binutils-2.31.1/builddir-single/bfd/../../bfd/elf64-x86-64.c:4551: undefined reference to `htab_traverse'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/libbfd.a(elf.o): in function `_bfd_elf_is_local_label_name':
/build/binutils-lybw70/binutils-2.31.1/builddir-single/bfd/../../bfd/elf.c:8682: undefined reference to `_sch_istable'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/libbfd.a(elflink.o): in function `elf_link_add_object_symbols':
/build/binutils-lybw70/binutils-2.31.1/builddir-single/bfd/../../bfd/elflink.c:5211: undefined reference to `objalloc_free_block'
/usr/bin/ld: /build/binutils-lybw70/binutils-2.31.1/builddir-single/bfd/../../bfd/elflink.c:5462: undefined reference to `_sch_istable'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/libbfd.a(elflink.o): in function `bfd_elf_size_dynamic_sections':
/build/binutils-lybw70/binutils-2.31.1/builddir-single/bfd/../../bfd/elflink.c:6655: undefined reference to `lbasename'
/usr/bin/ld: /build/binutils-lybw70/binutils-2.31.1/builddir-single/bfd/../../bfd/elflink.c:6428: undefined reference to `lbasename'
I'm trying to build/link it similar to the instructions here: https://github.com/projectcalico/bpftool, but instead of building it from the Linux kernel, I thought it would be faster to git clone this repo instead, but it doesn't seem to work when trying to statically link it.
P.S. Without the CFLAGS=--static part, it works, but I need the binary statically linked
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qmonnet
commented on July 16, 2024
Hi, and thanks for the report! The README specifies that note that this does not work out-of-the-box when linking with libbfd, and this is what you're facing (at least on Debian).
I haven't found the time to look into the details for compiling statically with libbfd or llvm. I've been told that it works with LLVM, provided that the statically compiled version of the library is installed. For libbfd, it seems the libbfd.a library on the system is not enough, but I need to dig more to figure out the cause of these messages. Eventually we probably want to try static builds in the CI, too.
In the meantime, a quick workaround would be to disable linking against libbfd/llvm; then CFLAGS=--static make works for me (tested on Ubuntu). At the moment you have to edit the Makefile to disable libbfd/llvm, though.
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huang195
commented on July 16, 2024
@qmonnet oh hey thanks for the quick reply. Can I ask what did you modify in the Makefile to disable libbfd/llvm? I can try it on my Debian box, and if it doesn't work, I can certainly try it on Ubuntu as well.
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huang195
commented on July 16, 2024
Ah I figured it out, just putting it here in case others might need a workaround:
root@eb84dabef474:/bpftool/src# ldd bpftool
not a dynamic executable
root@eb84dabef474:/bpftool/src# git diff Makefile
diff --git a/src/Makefile b/src/Makefile
index c2b9200..b12f82d 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -20,6 +20,9 @@ else
endif
BOOTSTRAP_OUTPUT := $(_OUTPUT)bootstrap/
+feature-llvm := 0
+feature-libbfd := 0
+
LIBBPF_OUTPUT := $(_OUTPUT)libbpf/
LIBBPF_DESTDIR := $(LIBBPF_OUTPUT)
LIBBPF_INCLUDE := $(LIBBPF_DESTDIR)include
@@ -143,11 +146,11 @@ ifeq ($(feature-llvm),1)
else
# Fall back on libbfd
ifeq ($(feature-libbfd),1)
- LIBS += -lbfd -ldl -lopcodes
+ LIBS += -ldl -lopcodes
else ifeq ($(feature-libbfd-liberty),1)
- LIBS += -lbfd -ldl -lopcodes -liberty
+ LIBS += -ldl -lopcodes -liberty
else ifeq ($(feature-libbfd-liberty-z),1)
- LIBS += -lbfd -ldl -lopcodes -liberty -lz
+ LIBS += -ldl -lopcodes -liberty -lz
endif
# If one of the above feature combinations is set, we support libbfd
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qmonnet
commented on July 16, 2024
Yes, disabling them should be doable just by changing FEATURE_TESTS, but I realise the Makefile.feature I did for this repo ignores FEATURE_TESTS and always run the detection. I'll fix that soon.
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qmonnet
commented on July 16, 2024
It was a useful report, I opened another issue as a follow-up.
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qmonnet
commented on July 16, 2024
I also fixed the usage of FEATURE_TESTS in the Makefile, so it's easier to tweak it to disable some features.
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