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[PATCH] Fix handling of POSIX paths containing a root-name


Fix path appending and concatenating to work correctly for a leading
root-name. Check a new macro, SLASHSLASH_IS_ROOT_NAME, instead of making
the behaviour depend directly on __CYGWIN__.

	* src/filesystem/std-path.cc (SLASHSLASH_IS_ROOT_NAME): New macro to
	control whether interpret paths with two slashes as a root-name.
	(path::operator/=(const path&)) [SLASHSLASH_IS_ROOT_NAME]: Add a
	root-directory when appending to a root-name.
	(path::_M_append(basic_string_view<value_type>))
	[SLASHSLASH_IS_ROOT_NAME]: Likewise.
	(path::operator/=(const path&)) [SLASHSLASH_IS_ROOT_NAME]: Likewise.
	(path::_M_concat(basic_string_view<value_type>))
	[SLASHSLASH_IS_ROOT_NAME]: Likewise.
	(path::lexically_normal()) [SLASHSLASH_IS_ROOT_NAME]: Use += instead
	of /= to add a root-directory to the result.
	* testsuite/27_io/filesystem/path/decompose/root_directory.cc: Fix
	expected result for Cygwin.

Tested x86_64-linux, as committed, and also with the new
SLASHSLASH_IS_ROOT_NAME macro defined to test that version of the
code.

Committed to trunk.


Attachment: patch.txt
Description: Text document


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