CODEWITHSUNDEEP
c++symbolslibstdc++
Christian Vorhemus
Christian Vorhemus

Reputation: 2663

Symbol names convention in libstdc++

During building a library I got the following "undefined reference" error:

libtbb.so.2: undefined reference to `__cxa_init_primary_exception@CXXABI_1.3.11'

When I checked the symbols in my libstdc++ library I saw the following

nm -CD libstdc++.so.6.0.24 | grep "__cxa_init_primary_exception"
000000000008fdd8 T __cxa_init_primary_exception@@CXXABI_1.3.11

So the only difference between the symbol name in libstdc++.so and what libtbb.so seems to require is an additional "@" in the symbol name. Even more interesting if I type

nm -C libtbb.so.2 | grep "__cxa_init_primary_exception"
                 U __cxa_init_primary_exception@@CXXABI_1.3.11

I see that libtbb requires a symbol which actually includes a double @. What's the ratio behind this naming convention and why does the linker search for a symbol name with one @?

Upvotes: 1

Views: 380

Answers (1)

JHBonarius
JHBonarius

Reputation: 11271

Maybe related to a known issue?

It's also mentioned here:

...current TBB has problems with gcc-libs, it’s compiled with gcc-libs 7.x so you will get this error if you try to build OpenCV with newest TBB

Proposed solution there:

This is also posted here, workaround is you should install TBB 2017_20170412-1 from Arch Linux Archive. To do this, first install newest TBB and then downgrade it.

Upvotes: 1

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