[PATCH 0/2] libstdc++: Support UNC paths on MinGW in fs::path

[Johannes Grunenberg]

These two patches add support for UNC paths on MinGW,
i.e. paths like `\\server\foo\bar\baz.txt`.
This is my first time submitting a patch to the GCC repo, so I'm not
fully sure if I submitted the patch correctly.

This was tested on x86_64-w64-mingw32.

I'll try to look at the fs-operations on UNC paths after this patch,
since some of them (like fs::canonical) break with UNC paths.

Johannes Grunenberg (2):
  libstdc++: Support UNC paths on MinGW in fs::path
  libstdc++: Extend tests for UNC paths on MinGW

 libstdc++-v3/config/abi/pre/gnu.ver           |  7 +++++++
 libstdc++-v3/include/bits/fs_path.h           | 13 +++++++++++-
 libstdc++-v3/src/c++17/fs_path.cc             | 14 +++++++++++--
 .../27_io/filesystem/path/append/path.cc      | 17 +++++++++++++++-
 .../27_io/filesystem/path/append/source.cc    | 14 +++++++++++++
 .../filesystem/path/decompose/extension.cc    |  5 +++++
 .../filesystem/path/decompose/filename.cc     |  2 +-
 .../path/decompose/relative_path.cc           |  9 +++++++++
 .../path/decompose/root_directory.cc          |  3 ++-
 .../filesystem/path/decompose/root_name.cc    | 20 +++++++++++++++++++
 .../filesystem/path/decompose/root_path.cc    | 13 ++++++++++++
 .../27_io/filesystem/path/decompose/stem.cc   |  5 +++++
 .../filesystem/path/generation/normal.cc      |  2 +-
 .../filesystem/path/generation/relative.cc    | 14 +++++++++++++
 .../27_io/filesystem/path/generic/94242.cc    |  8 ++++++++
 .../filesystem/path/generic/generic_string.cc |  6 +++++-
 .../27_io/filesystem/path/generic/utf.cc      |  6 +++++-
 .../27_io/filesystem/path/generic/wchar_t.cc  |  6 +++++-
 .../27_io/filesystem/path/itr/traversal.cc    |  6 +++---
 .../filesystem/path/query/is_absolute.cc      |  1 +
 20 files changed, 158 insertions(+), 13 deletions(-)

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2.49.0.windows.1