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[PATCH] PR libstdc++/85632 fix wraparound in filesystem::space

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, 3 May 2018 19:57:51 +0100
Subject: [PATCH] PR libstdc++/85632 fix wraparound in filesystem::space

On 32-bit targets any values over 4GB would wrap and produce the wrong
result.

	PR libstdc++/85632 use uintmax_t for arithmetic
	* src/filesystem/ops.cc (experimental::filesystem::space): Perform
	arithmetic in result type.
	* src/filesystem/std-ops.cc (filesystem::space): Likewise.
	* testsuite/27_io/filesystem/operations/space.cc: Check total capacity
	is greater than free space.
	* testsuite/experimental/filesystem/operations/space.cc: New.

Tested x86_64-linux -m32/-m64, committed to trunk. Backports for all
branches to follow.

Attachment: patch.txt
Description: Text document

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