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royjacobson / externis

Generate profiling traces for GCC

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`undefined symbol: _Z14decl_as_stringP9tree_nodei`

cmcquinn opened this issue · comments

commented

I am getting cc1: error: cannot load plugin /usr/lib/gcc/x86_64-linux-gnu/11/plugin/externis.so: /usr/lib/gcc/x86_64-linux-gnu/11/plugin/externis.so: undefined symbol: _Z14decl_as_stringP9tree_nodei after building with gcc11 on ubuntu 22.04.

commented

This is weird. Did you compile the plugin using the same compiler that you try to use it with? Could you post the output of ldd /usr/lib/gcc/x86_64-linux-gnu/11/plugin/externis.so?

commented 
ldd /usr/lib/gcc/x86_64-linux-gnu/11/plugin/externis.so
        linux-vdso.so.1 (0x00007ffceed38000)
        libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f3a29db3000)
        libgcc_s.so.1 => /usr/lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f3a29d93000)
        libc.so.6 => /usr/lib/x86_64-linux-gnu/libc.so.6 (0x00007f3a29b6b000)
        libm.so.6 => /usr/lib/x86_64-linux-gnu/libm.so.6 (0x00007f3a29a84000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f3a2a042000)

I am building and using externis with gcc 11.

commented

Ok, I think I understand the issue -

root@d42820f69d52:/lib# grep _Z14decl_as_stringP9tree_nodei -R
grep: gcc/x86_64-linux-gnu/11/plugin/externis.so: binary file matches
grep: gcc/x86_64-linux-gnu/11/cc1plus: binary file matches

It seems that the symbol is only available as a C++ compiler plugin and not as a C compiler plugin. I'm not sure how to fix this, though. Could you ask in the GCC mailing list about this? In the meantime I can only suggest the workaround of not using the plugin when compiling for C.