[Bug libstdc++/85632] std::filesystem::space or std::experimental::filesystem::space does not return correct information

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85632

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu May  3 19:53:42 2018
New Revision: 259906

URL: https://gcc.gnu.org/viewcvs?rev=259906&root=gcc&view=rev
Log:
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.

Added:
   
branches/gcc-8-branch/libstdc++-v3/testsuite/experimental/filesystem/operations/space.cc
      - copied, changed from r259898,
branches/gcc-8-branch/libstdc++-v3/testsuite/27_io/filesystem/operations/space.cc
Modified:
    branches/gcc-8-branch/libstdc++-v3/ChangeLog
    branches/gcc-8-branch/libstdc++-v3/src/filesystem/ops.cc
    branches/gcc-8-branch/libstdc++-v3/src/filesystem/std-ops.cc
   
branches/gcc-8-branch/libstdc++-v3/testsuite/27_io/filesystem/operations/space.cc