In the case of Kadu this was actually caused by Kadu being built with
hardened flags and one header declaring a function that was never
implemented or called. We deleted that declaration and it fixed the
problem. You can check for any possibly missing symbols by exporting an
LD_BIND_NOW=1 environment variable and the running the program. Though,
I really doubt all these apps problems are about missing symbols.

Also, if linking explicitly with -lgcc_s fixes the problem for you, you
can try running `LD_PRELOAD=/path/to/libgcc_s.so.1 your_app', maybe it
will work.

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https://bugs.launchpad.net/bugs/40285

Title:
  libgcc_s.so.1 must be installed for pthread_cancel to work

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