It's not a linker error, and x86_64 mainline gcc  4.10.0 20140727 fails
similarly.

nm bytearraymodel_p.o | grep __warn
                 U __warn_memset_zero_len

Linking this object file against libc_nonshared.a (which is where this
symbol is defined) generates the linker warning which is turned into an
error by -Wl,--fatal-warnings.

So a gcc bug.

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https://bugs.launchpad.net/bugs/1352836

Title:
  link failure when package is built with -O3 (14.10)

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