ELF:链接:为什么我在.so文件中获得未定义的引用 [英] ELF: linking: Why do I get undefined references in .so files

问题描述

我正在尝试针对wxWidgets构建程序，但出现链接器错误.我想真正理解它的意思.错误是:

I'm trying to build a program against wxWidgets, and I get a linker error. I'd like to really understand what it means. The error is:

/usr/lib/libwx_baseu-2.8.so: undefined reference to `std::ctype<char>::_M_widen_init() const@GLIBCXX_3.4.11'

我不明白的是为什么错误出现在libwx_baseu-2.8.so上.我认为.so文件的所有符号都已解析，与.o文件仍然需要链接相反.

What I don't understand is why the error is at libwx_baseu-2.8.so. I thought that .so files had all its symbols resolved, contrary to .o files that still need linking.

当我ldd .so时，我可以解析其所有链接的库，因此那里没有问题:

When I ldd the .so, I get can resolve all its linked libraries, so there is no problem there:

$ ldd /usr/lib/libwx_baseu-2.8.so
 linux-gate.so.1 =>  (0x00476000)
 libz.so.1 => /lib/libz.so.1 (0x00d9c000)
 libdl.so.2 => /lib/libdl.so.2 (0x002a8000)
 libm.so.6 => /lib/libm.so.6 (0x00759000)
 libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x002ad000)
 libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x0068d000)
 libpthread.so.0 => /lib/libpthread.so.0 (0x006f0000)
 libc.so.6 => /lib/libc.so.6 (0x00477000)
 /lib/ld-linux.so.2 (0x007f6000)

这是否意味着.so文件未正确编译(在这种情况下，这是我的分发程序包中的错误)，还是意味着我的特定程序的链接器命令行上缺少库?

Does it means that the .so file was not compiled correctly (in that case, it's a bug in my distribution package) or does it means that there are missing libraries on the linker command line for my particular program?

此外，您知道我如何获得ELF文件中未定义符号的列表.我尝试了readelf -s，但是找不到丢失的符号.

Additionally, do you know how I can get a list on undefined symbols in an ELF file. I tried readelf -s but I can't find the missing symbol.

谢谢.

Mildred

推荐答案

I thought that .so files had all its symbols resolved, contrary to .o files that still need linking.

共享库可能不完整，可以.

Shared libraries can be incomplete, that is OK.

do you know how I can get a list on undefined symbols in an ELF file

使用

nm -C -u libwx_baseu-2.8.so

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