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POELF: linking: Why do I get undefined references in .so files
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2010-04-15T08:26:50.723
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2012-03-22T09:37:35.470
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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: <pre><code>/usr/lib/libwx_baseu-2.8.so: undefined reference to `std::ctype<char>::_M_widen_init() const@GLIBCXX_3.4.11' </code></pre> What I don't understand is why the error is at <code>libwx_baseu-2.8.so</code>. I thought that <code>.so</code> files had all its symbols resolved, contrary to <code>.o</code> files that still need linking. When I <code>ldd</code> the <code>.so</code>, I get can resolve all its linked libraries, so there is no problem there: <pre><code>$ 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) </code></pre> Does it means that the <code>.so</code> 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? Additionally, do you know how I can get a list on undefined symbols in an ELF file. I tried <code>readelf -s</code> but I can't find the missing symbol. Thank you. Mildred
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<c++><linker><shared-libraries><symbols><elf>
Title
ELF: linking: Why do I get undefined references in .so files
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1. COIf you have a problem while linking, it could be helpful if you posted the exact linker command line.
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