[Bug libstdc++/65049] Undefined behaviour with std::char_traits<char>

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65049

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Mon Aug 24 13:43:54 2015
New Revision: 227127

URL: https://gcc.gnu.org/viewcvs?rev=227127&root=gcc&view=rev
Log:
        PR libstdc++/65049
        * include/bits/char_traits.h (char_traits<char>::compare,
        char_traits<char>::find, char_traits<char>::move,
        char_traits<char>::copy, char_traits<char>::assign): Check for zero
        length.
        (char_traits<wchar_t>::compare, char_traits<wchar_t>::find,
        char_traits<wchar_t>::move, char_traits<wchar_t>::copy,
        char_traits<wchar_t>::assign): Likewise.
        (char_traits<char16_t>::move, char_traits<char16_t>::copy): Likewise.
        (char_traits<char32_t>::move, char_traits<char32_t>::copy): Likewise.
        * include/ext/pod_char_traits.h (char_traits<character<>>::move,
        char_traits<character<>>::copy): Likewise.
        * testsuite/21_strings/char_traits/requirements/char/65049.cc: New.
        * testsuite/21_strings/char_traits/requirements/char16_t/65049.cc:
        New.
        * testsuite/21_strings/char_traits/requirements/char32_t/65049.cc:
        New.
        * testsuite/21_strings/char_traits/requirements/wchar_t/65049.cc:
        New.

Added:
   
trunk/libstdc++-v3/testsuite/21_strings/char_traits/requirements/char/65049.cc
   
trunk/libstdc++-v3/testsuite/21_strings/char_traits/requirements/char16_t/65049.cc
   
trunk/libstdc++-v3/testsuite/21_strings/char_traits/requirements/char32_t/65049.cc
   
trunk/libstdc++-v3/testsuite/21_strings/char_traits/requirements/wchar_t/65049.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/char_traits.h
    trunk/libstdc++-v3/include/ext/pod_char_traits.h