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[PATCH] PR libstdc++/85818 ensure path::preferred_separator is defined

From: Jonathan Wakely <jwakely at redhat dot com>
To: libstdc++ at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Thu, 17 May 2018 16:36:18 +0100
Subject: [PATCH] PR libstdc++/85818 ensure path::preferred_separator is defined

Because path.cc is compiled with -std=gnu++17 the static constexpr
data member is implicitly 'inline' and so no definition gets emitted
unless it gets used in that translation unit. Other translation units
built as C++11 or C++14 still require a namespace-scope definition of
the variable, so mark the definition as used.

	PR libstdc++/85818
	* src/filesystem/path.cc (path::preferred_separator): Add used
	attribute.
	* testsuite/experimental/filesystem/path/preferred_separator.cc: New.

Tested powerpc64le-linux, committed to trunk. Backport to gcc-8 to
follow.

Attachment: patch.txt
Description: Text document

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