[Bug libstdc++/77801] std::experimental::gcd std::experimental::lcd use non-constexpr std::abs

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77801

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Fri Sep 30 13:43:37 2016
New Revision: 240656

URL: https://gcc.gnu.org/viewcvs?rev=240656&root=gcc&view=rev
Log:
Remove use of std::abs in experimental::{gcd,lcm}

        PR libstdc++/77801
        * include/experimental/numeric: Include <numeric>.
        (__abs): Define.
        (gcd, lcm): Use __abs instead of std::abs.
        * testsuite/experimental/numeric/77801.cc: New test.
        * testsuite/experimental/numeric/gcd.cc: Test unsigned inputs.
        * testsuite/experimental/numeric/lcm.cc: Likewise.

Added:
    trunk/libstdc++-v3/testsuite/experimental/numeric/77801.cc
      - copied, changed from r240653,
trunk/libstdc++-v3/testsuite/experimental/numeric/gcd.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/experimental/numeric
    trunk/libstdc++-v3/testsuite/experimental/numeric/gcd.cc
    trunk/libstdc++-v3/testsuite/experimental/numeric/lcm.cc