Unable to create static binary because of undefined reference to dbus

I get these errors when I try to statically link my Go program that uses Gopacket:

/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/11/../../../x86_64-linux-gnu/libpcap.a(pcap-dbus.o): in function `dbus_write':
(.text 0x103): undefined reference to `dbus_message_demarshal'
/usr/bin/ld: (.text 0x119): undefined reference to `dbus_connection_send'
/usr/bin/ld: (.text 0x122): undefined reference to `dbus_connection_flush'
/usr/bin/ld: (.text 0x12a): undefined reference to `dbus_message_unref'
/usr/bin/ld: (.text 0x178): undefined reference to `dbus_error_free'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/11/../../../x86_64-linux-gnu/libpcap.a(pcap-dbus.o): in function `dbus_read':
(.text 0x1c3): undefined reference to `dbus_connection_pop_message'
/usr/bin/ld: (.text 0x1e1): undefined reference to `dbus_connection_pop_message'
/usr/bin/ld: (.text 0x1f6): undefined reference to `dbus_connection_read_write'
/usr/bin/ld: (.text 0x262): undefined reference to `dbus_message_is_signal'
/usr/bin/ld: (.text 0x27f): undefined reference to `dbus_message_marshal'
/usr/bin/ld: (.text 0x2e3): undefined reference to `dbus_free'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/11/../../../x86_64-linux-gnu/libpcap.a(pcap-dbus.o): in function `dbus_cleanup':
(.text 0x350): undefined reference to `dbus_connection_unref'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/11/../../../x86_64-linux-gnu/libpcap.a(pcap-dbus.o): in function `dbus_activate':
(.text 0x3fa): undefined reference to `dbus_connection_open'
/usr/bin/ld: (.text 0x412): undefined reference to `dbus_bus_register'
...

Indeed these symbols indeed either do not exist /usr/lib/gcc/x86_64-linux-gnu/11/../../../x86_64-linux-gnu/libpcap.a or show up as undefined. For example:

$ readelf -s /usr/lib/gcc/x86_64-linux-gnu/11/../../../x86_64-linux-gnu/libpcap.a | grep dbus_message_marshal
    42: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND dbus_message_marshal

None of these functions are called from my program, but are happening because of the dependency to Gopacket.

I have libpcap installed:

$ apt list --installed|grep pcap

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

libpcap-dev/jammy,now 1.10.1-4build1 amd64 [installed]
libpcap0.8-dev/jammy,now 1.10.1-4build1 amd64 [installed]
libpcap0.8/jammy,now 1.10.1-4build1 amd64 [installed,automatic]

Is there anything else I need? Here's how I compile:

GOOS=linux CGO_ENABLED=1 go build \
    -ldflags "-linkmode external -extldflags \"-static\"" \
    -o bin/myprog \
    -buildvcs=false

If I do not include -ldflags, the program compiles, but it is not statically linked.

I am using Go 1.18.

CodePudding user response：

do not exist /usr/lib/gcc/x86_64-linux-gnu/11/../../../x86_64-linux-gnu/libpcap.a

They are not in libpcap. They are called by that version of libpcap.

You will have to link with all of the libraries reported by pkg-config --libs --static libdpdk in order to statically link that version of libpcap with any program whether it's in Go or not.

CodePudding user response：

It's seems like it is impossible to make a statically linked binary that uses Gopacket.

I updated the build command to use libdbus-1. This got rid of the undefined dbus_* errors:

GOOS=linux CGO_ENABLED=1 CGO_LDFLAGS="-ldbus-1" go build \
    -ldflags "-linkmode external -extldflags \"-static\"" \
    -o bin/app \
    -buildvcs=false

However, I got this error:

/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/11/../../../x86_64-linux-gnu/libdbus-1.a(libdbus_1_la-dbus-sysdeps-unix.o): in function `_dbus_listen_systemd_sockets':
(.text 0x200e): undefined reference to `sd_listen_fds'
/usr/bin/ld: (.text 0x204f): undefined reference to `sd_is_socket'
collect2: error: ld returned 1 exit status

These functions come from libsystemd. I installed libsystemd-dev, but it seems like there is no static library for libsystemd.