使用go编译交叉编译CGO_ENABLED – 警告：找不到libudev.so.1
我正在尝试为CGO_ENABLED=1交叉编译Golang应用程序，因为libusb依赖
在编译期间，我得到错误：
arm-linux-gnueabihf/bin/ld: warning: libudev.so.1, needed by /usr/lib/arm-linux-gnueabihf/libusb-1.0.so, not found (try using -rpath or -rpath-link)
我已经尝试了下面的命令的多个变种，没有运气：
CGO_ENABLED=1 GOARCH=arm GOARM=7 PKG_CONFIG_LIBDIR=/usr/lib/arm-linux-gnueabihf/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig CC=arm-linux-gnueabihf-gcc CXX=arm-linux-gnueabihf-g++ go build -x -ldflags '-extld=arm-linux-gnueabihf-gcc -rpath=/usr/lib/arm-linux-gnueabihf -L/usr/lib/arm-linux-gnueabihf -ludev'
当我用-x标志运行这个版本的时候，我得到了详细的输出结果，而且在build立src/net包的时候，它看起来像是失败了。
cd /usr/local/go/src/net /usr/local/go/pkg/tool/linux_amd64/cgo -dynpackage net -dynimport $WORK/net/_obj/_cgo_.o -dynout $WORK/net/_obj/_cgo_import.go arm-linux-gnueabihf-gcc -I . -fPIC -marm -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -o $WORK/net/_obj/_all.o $WORK/net/_obj/_cgo_export.o $WORK/net/_obj/cgo_linux.cgo2.o $WORK/net/_obj/cgo_resnew.cgo2.o $WORK/net/_obj/cgo_socknew.cgo2.o $WORK/net/_obj/cgo_unix.cgo2.o -g -O2 -Wl,-r -nostdlib -Wl,--build-id=none /usr/local/go/pkg/tool/linux_amd64/compile -o $WORK/net.a -trimpath $WORK -p net -buildid 9e58c94d1ddeba63666a35ecee9409056baf5d3c -D _/usr/local/go/src/net -I $WORK -pack ./addrselect.go ./conf.go ./dial.go ./dnsclient.go ./dnsclient_unix.go ./dnsconfig_unix.go ./dnsmsg.go ./fd_mutex.go ./fd_poll_runtime.go ./fd_posix.go ./fd_unix.go ./file.go ./file_unix.go ./hook.go ./hook_cloexec.go ./hook_unix.go ./hosts.go ./interface.go ./interface_linux.go ./ip.go ./iprawsock.go ./iprawsock_posix.go ./ipsock.go ./ipsock_posix.go ./lookup.go ./lookup_unix.go ./mac.go ./net.go ./nss.go ./parse.go ./pipe.go ./port.go ./port_unix.go ./sendfile_linux.go ./sock_cloexec.go ./sock_linux.go ./sock_posix.go ./sockopt_linux.go ./sockopt_posix.go ./sockoptip_linux.go ./sockoptip_posix.go ./tcpsock.go ./tcpsock_posix.go ./tcpsockopt_posix.go ./tcpsockopt_unix.go ./udpsock.go ./udpsock_posix.go ./unixsock.go ./unixsock_posix.go ./writev_unix.go $WORK/net/_obj/_cgo_gotypes.go $WORK/net/_obj/cgo_linux.cgo1.go $WORK/net/_obj/cgo_resnew.cgo1.go $WORK/net/_obj/cgo_socknew.cgo1.go $WORK/net/_obj/cgo_unix.cgo1.go $WORK/net/_obj/_cgo_import.go # github.com/resin-io/edge-node-manager/vendor/github.com/kylelemons/gousb/usb /tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/../lib/gcc/arm-linux-gnueabihf/4.8.3/../../../../arm-linux-gnueabihf/bin/ld: warning: libudev.so.1, needed by /usr/lib/arm-linux-gnueabihf/libusb-1.0.so, not found (try using -rpath or -rpath-link) /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_monitor_filter_add_match_subsystem_devtype@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_monitor_enable_receiving@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_enumerate_scan_devices@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_new@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_device_get_devnode@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_enumerate_new@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_list_entry_get_name@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_enumerate_add_match_subsystem@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_device_get_sysname@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_enumerate_get_list_entry@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_device_new_from_syspath@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_monitor_new_from_netlink@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_monitor_receive_device@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_device_unref@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_enumerate_unref@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_monitor_get_fd@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_list_entry_get_next@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_monitor_unref@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `clock_gettime@GLIBC_2.17' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_unref@LIBUDEV_183' /usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `udev_device_get_action@LIBUDEV_183' collect2: error: ld returned 1 exit status
奇怪的是，编译器可以find/usr/lib/arm-linux-gnueabihf/libusb-1.0.so ，如果我在该目录下做ls -al ， libudev.so也是存在的。 这两个文件链接回到/lib/arm-linux-gnueabihf/
lrwxrwxrwx 1 root root 41 Jan 7 04:14 libudev.so -> /lib/arm-linux-gnueabihf/libudev.so.1.5.0 -rw-r--r-- 1 root root 105464 Jun 16 2014 libusb-1.0.a lrwxrwxrwx 1 root root 44 Jun 16 2014 libusb-1.0.so -> /lib/arm-linux-gnueabihf/libusb-1.0.so.0.1.0 drwxr-xr-x 2 root root 4096 Mar 15 14:48 pkgconfig
/usr/lib/arm-linux-gnueabihf/pkgconfig包含：
-rw-r--r-- 1 root root 513 Jan 7 04:13 libudev.pc -rw-r--r-- 1 root root 332 Jun 16 2014 libusb-1.0.pc
最后，运行file显示libusb和libudev是正确的架构：
/lib/arm-linux-gnueabihf/libusb-1.0.so.0.1.0: ELF 32-bit LSB shared object, ARM, EABI5 version 1 (SYSV), dynamically linked, BuildID[sha1]=7d7b487c91042c1f254b39516b4aeabedfb828fc, stripped /lib/arm-linux-gnueabihf/libudev.so.1.5.0: ELF 32-bit LSB shared object, ARM, EABI5 version 1 (SYSV), dynamically linked, BuildID[sha1]=334f4f0d8b1222a324ccd0827c1613fdd1e2ec15, stripped
libudev.so.1的path是错误的。
它应该在这些目录之一中：
./arm-linux-gnueabihf/lib ./arm-linux-gnueabihf/libc/lib ./arm-linux-gnueabihf/libc/usr/lib
但是很抱歉，我忘记了哪个目录是正确的。 所以你可以尝试将libudev.so.1复制到所有这些目录中。