[PATCH] PR libstdc++/90557 fix path assignment that alters source

[Jonathan Wakely]

On 22/05/19 23:14 +0100, Jonathan Wakely wrote:
>	PR libstdc++/90557
>	* src/c++17/fs_path.cc (path::_List::operator=(const _List&)): Fix
>	reversed arguments to uninitialized_copy_n.
>	* testsuite/27_io/filesystem/path/assign/copy.cc: Check that source
>	is unchanged by copy assignment.
>	* testsuite/util/testsuite_fs.h (compare_paths): Use std::equal to
>	compare path components.

I should have used the three-argument version of std::equal, because
the four-argument one is not available in C++11.

Fixed with this patch, tested powerpc64le-linux and committed to
trunk. This needs to be backported togcc-9-branch too.


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