[Bug c++/105657] Build failure in firefox libxul.so if -DGLIBCXX_ASSERTIONS is in my CXXFLAGS

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105657

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
That symbol is in libstdc++.so.6.0.30 so I assume you're linking to the wrong
libstdc++.so, which is probably caused by -L/usr/lib/../lib

Try adding -Wl,--trace to the g++ linker command and see which libstdc++.so is
being used.