用arm-linux-gcc4.4.3編譯busybox1.31的時候出現了很多問題，困擾了我許久，現在列出這些問題和解決方法
coreutils/lib.a(mktemp.o): in function `mktemp_main':
mktemp.c:(.text.mktemp_main+0x8c): warning: the use of `mktemp' is dangerous, better use `mkstemp'
coreutils/lib.a(sync.o): in function `sync_common':
sync.c:(.text.sync_common+0x34): undefined reference to `syncfs'
collect2: ld returned 1 exit status
note: if build needs additional libraries, put them in config_extra_ldlibs.
example: config_extra_ldlibs="pthread dl tirpc audit pam"
makefile:718: recipe for target 'busybox_unstripped' failed
make: *** [busybox_unstripped] error 1
make menuconfig-->coreutils—>sync選項去掉，重新make編譯通過
util-linux/lib.a(nsenter.o): in function `nsenter_main':
nsenter.c:(.text.nsenter_main+0x1a8): undefined reference to `setns'
coreutils/lib.a(sync.o): in function `sync_common':
sync.c:(.text.sync_common+0x34): undefined reference to `syncfs'
collect2: ld returned 1 exit status
make menuconfig-->linux system utilities—>nsenter，去掉該選項，重新編譯make
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