问题描述
可执行文件似乎无法解析链接库中的符号. LD_DEBUG = libs的相关输出显示正确的库已加载:6557: /usr/lib/libcharon.so.0: error: symbol lookup error: undefined symbol: auth_class_names (fatal) /usr/libexec/ipsec/charon: symbol lookup error: /usr/lib/libcharon.so.0: undefined symbol: auth_class_names
An executable seemingly can't resolve a symbol in a linked library. The relevant output of LD_DEBUG=libs shows that the correct library is loaded:6557: /usr/lib/libcharon.so.0: error: symbol lookup error: undefined symbol: auth_class_names (fatal) /usr/libexec/ipsec/charon: symbol lookup error: /usr/lib/libcharon.so.0: undefined symbol: auth_class_names
nm -D显示定义了符号auth_class_names:
nm -D shows that the symbol auth_class_names is defined:
nm -D /usr/lib/libcharon.so.0|grep auth_class_names U auth_class_names
nm -D /usr/lib/libcharon.so.0|grep auth_class_names U auth_class_names
欢迎所有线索和想法
添加了ldd的输出:
/usr/lib# ldd /usr/lib/libstrongswan.so
libpthread.so.0 => /lib/arm-linux-gnueabi/libpthread.so.0 (0xb6ecd000)
libdl.so.2 => /lib/arm-linux-gnueabi/libdl.so.2 (0xb6ec2000)
librt.so.1 => /lib/arm-linux-gnueabi/librt.so.1 (0xb6eb3000)
libc.so.6 => /lib/arm-linux-gnueabi/libc.so.6 (0xb6d78000)
/lib/ld-linux.so.3 (0xb6f25000)
/usr/lib# ldd /usr/lib/libcharon.so
libm.so.6 => /lib/arm-linux-gnueabi/libm.so.6 (0xb6ea6000)
libpthread.so.0 => /lib/arm-linux-gnueabi/libpthread.so.0 (0xb6e86000)
libdl.so.2 => /lib/arm-linux-gnueabi/libdl.so.2 (0xb6e7b000)
libcap.so.2 => /lib/arm-linux-gnueabi/libcap.so.2 (0xb6e70000)
libc.so.6 => /lib/arm-linux-gnueabi/libc.so.6 (0xb6d35000)
/lib/ld-linux.so.3 (0xb6fa6000)
libattr.so.1 => /lib/arm-linux-gnueabi/libattr.so.1 (0xb6d27000)
# nm -D /usr/lib/libstrongswan.so|grep auth_class
00036a50 D auth_class_names
推荐答案
否:表明auth_class_names
是在libcharon.so
中定义的 un .
No: it shows that auth_class_names
is undefined in libcharon.so
.
再次错误:libcharon.so
确实引用了该符号.
Wrong again: libcharon.so
does reference the symbol.
这不是您想要的东西.您要ldd /usr/lib/libcharon.so
.
That's not what you want. You want ldd /usr/lib/libcharon.so
.
您的问题很可能是邻居libcharon.so
或主可执行文件都未链接到libstrongswan.so
,因此,当您动态加载libcharon.so
时,找不到libstrongswan.so
了;因此,加载失败并带有未定义的符号.
Your problem is most likely that neigher libcharon.so
, nor the main executable were linked against libstrongswan.so
, so when you dynamically load libcharon.so
, libstrongswan.so
is nowhere to be found; hence the loading fails with undefined symbol.
有几种可能的解决方案,从更正确到更hacky:
There are several possible solutions, ordered from more correct to more hacky:
-
将
libcharon.so
与libstrongswan.so
链接.加载libcharon.so
将加载其所有依赖项(现在将包含libstrongswan.so
,并且将找到符号).
Link
libcharon.so
againstlibstrongswan.so
. Loadinglibcharon.so
will load all of its dependencies (which will now includelibstrongswan.so
, and the symbol will be found).
将charon
二进制文件链接到libstrongswan.so
.
这篇关于符号查找错误未定义符号,但似乎所有符号都存在的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!