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<a href="https://github.com/tarantool/tarantool/commit/<a class=hub.com/tarantool/tarantool/commit/8915ae203f873198caf76fbad4bf9edce76a6153">8915ae203<a href="https://github.com/tarantool/tarantool/commit/8915ae203f873198caf76fbad4bf9edce76a6153">&quot;&gt;bitset: replace zero-length array with flexible-array member

Zero-lenght arrays are GNU C extension.
There&amp;#39;s ISO C99 flexible array member, which
is preffered mechanism to declare variable-length types.

Flexible array member allows us to avoid applying sizeof
operator cause it&amp;#39;s incomplete type, so it will be an error
at compile time. There&amp;#39;re any moments else why it&amp;#39;s better
way to implement such structures via FAM:
https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html

In this issue it fixed gcc 10 warning:
&amp;quot;warning: writing 1 byte into
a region of size 0 [-Wstringop-overflow=]&amp;quot;

Closes #4966
Closes #5564

(cherry picked from commit </a><a class="double-link" href="https://github.com/tarantool/tarantool/commit/<a class="double-link" href="https://github.com/tarantool/tarantool/commit/9b0278f4d25827239d291de338409bb237648d71">9b0278f4d</a>">9b0278f4d</a><a href="https://github.com/tarantool/tarantool/commit/8915ae203f873198caf76fbad4bf9edce76a6153">)

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