maintainer-feedback requested: [Bug 229888] devel/boost-libs: Fix undefined behavior in boost::filesystem::copy

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Bug 229888: devel/boost-libs: Fix undefined behavior in boost::filesystem::copy
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229888



--- Description ---
There is a bug in boost::filesystem::copy that leads to undefined behavior (and
segfault on 11.2 + clang6 + stackprotector support).

Example:

int main()
{
  boost::system::error_code ec;
  boost::filesystem::copy("/tmp/t.pdf", "/tmp/t2.pdf", ec);
}

This is caused by derefencing null pointers.

There is already a pull request on github:

https://github.com/boostorg/filesystem/pull/71

This patch pulls in this patch (tested) and fixes the issue. The same code
worked on 10.3 with clang 3.9 (at least on an older ports tree), that's why
this is a ticking time bomb for people upgrading to 11.2.