[Bug libstdc++/83025] [8 Regression] xfstream::open with char* gets caught on C++17 path overload.

["redi at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83025

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Fri Nov 17 14:07:58 2017
New Revision: 254871

URL: https://gcc.gnu.org/viewcvs?rev=254871&root=gcc&view=rev
Log:
PR libstdc++/83025 fix constraints for path overloads in <fstream>

        PR libstdc++/83025
        * include/std/fstream (basic_filebuf::_If_path): Move to
        namespace-scope and rename to _If_fs_path.
        (basic_filebuf::open): Use new name.
        (basic_ifstream(_Path, ios::openmode))
        (basic_ifstream::open(_Path, ios::openmode))
        (basic_ofstream(_Path, ios::openmode))
        (basic_ofstream::open(_Path, ios::openmode))
        (basic_fstream(_Path, ios::openmode))
        (basic_fstream::open(_Path, ios::openmode)): Use _If_fs_path.
        * testsuite/27_io/basic_filebuf/open/char/path.cc: Test with filename
        as non-const char*.
        * testsuite/27_io/basic_fstream/cons/char/path.cc: Likewise.
        * testsuite/27_io/basic_fstream/open/char/path.cc: Likewise.
        * testsuite/27_io/basic_ifstream/cons/char/path.cc: Likewise.
        * testsuite/27_io/basic_ifstream/open/char/path.cc: Likewise.
        * testsuite/27_io/basic_ofstream/cons/char/path.cc: Likewise.
        * testsuite/27_io/basic_ofstream/open/char/path.cc: Likewise.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/std/fstream
    trunk/libstdc++-v3/testsuite/27_io/basic_filebuf/open/char/path.cc
    trunk/libstdc++-v3/testsuite/27_io/basic_fstream/cons/char/path.cc
    trunk/libstdc++-v3/testsuite/27_io/basic_fstream/open/char/path.cc
    trunk/libstdc++-v3/testsuite/27_io/basic_ifstream/cons/char/path.cc
    trunk/libstdc++-v3/testsuite/27_io/basic_ifstream/open/char/path.cc
    trunk/libstdc++-v3/testsuite/27_io/basic_ofstream/cons/char/path.cc
    trunk/libstdc++-v3/testsuite/27_io/basic_ofstream/open/char/path.cc