https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66771
Bug ID: 66771
Summary: [5 Regression] -std=c++11 doesn't work
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
On Linux/x86-64, GCC 5 failed to compile 450.soplex in SPEC CPU 2006:
[hjl@gnu-ivb-1 build_base_lnx32e-gcc.0000]$ g++ -c -o mpsinput.o -DSPEC_CPU
-DNDEBUG -O2 -ffast-math -DSPEC_CPU_LP64 -fno-strict-aliasing
mpsinput.cc -std=c++11
mpsinput.cc: In member function \u2018bool soplex::MPSInput::readLine()\u2019:
mpsinput.cc:75:52: error: no match for \u2018operator==\u2019 (operand types
are \u2018std::basic_istream<char>::__istream_type {aka
std::basic_istream<char>}\u2019 and \u2018int\u2019)
if (m_input.getline(m_buf, sizeof(m_buf)) == 0)
^
mpsinput.cc:75:52: note: candidate: operator==(int, int) <built-in>
mpsinput.cc:75:52: note: no known conversion for argument 1 from
\u2018std::basic_istream<char>::__istream_type {aka
std::basic_istream<char>}\u2019 to \u2018int\u2019
In file included from /usr/include/c++/5.1.1/bits/locale_conv.h:41:0,
from /usr/include/c++/5.1.1/locale:43,
from /usr/include/c++/5.1.1/iomanip:43,
from spxlp.h:28,
from mpsinput.h:25,
from mpsinput.cc:29:
/usr/include/c++/5.1.1/bits/unique_ptr.h:635:5: note: candidate: template<class
_Tp, class _Dp> bool std::operator==(std::nullptr_t, const std::unique_ptr<_Tp,
_Dp>&)
operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept
^
/usr/include/c++/5.1.1/bits/unique_ptr.h:635:5: note: template argument
deduction/substitution failed:
mpsinput.cc:75:29: note: cannot convert
\u2018(&((soplex::MPSInput*)this)->soplex::MPSInput::m_input)->std::basic_istream<_CharT,
_Traits>::getline<char, std::char_traits<char>
>(((char*)(&((soplex::MPSInput*)this)->soplex::MPSInput::m_buf)),
((std::streamsize)sizeof
(((soplex::MPSInput*)this)->soplex::MPSInput::m_buf)))\u2019 (type
\u2018std::basic_istream<char>::__istream_type {aka
std::basic_istream<char>}\u2019) to type \u2018std::nullptr_t\u2019
if (m_input.getline(m_buf, sizeof(m_buf)) == 0)
^
In file included from /usr/include/c++/5.1.1/bits/locale_conv.h:41:0,
from /usr/include/c++/5.1.1/locale:43,
from /usr/include/c++/5.1.1/iomanip:43,
from spxlp.h:28,
from mpsinput.h:25,
from mpsinput.cc:29:
/usr/include/c++/5.1.1/bits/unique_ptr.h:630:5: note: candidate: template<class
_Tp, class _Dp> bool std::operator==(const std::unique_ptr<_Tp, _Dp>&,
std::nullptr_t)
operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept
^
/usr/include/c++/5.1.1/bits/unique_ptr.h:630:5: note: template argument
deduction/substitution failed:
mpsinput.cc:75:55: note: \u2018std::basic_istream<char>::__istream_type {aka
std::basic_istream<char>}\u2019 is not derived from \u2018const
std::unique_ptr<_Tp, _Dp>\u2019
if (m_input.getline(m_buf, sizeof(m_buf)) == 0)
^
In file included from /usr/include/c++/5.1.1/bits/locale_conv.h:41:0,
from /usr/include/c++/5.1.1/locale:43,
from /usr/include/c++/5.1.1/iomanip:43,
from spxlp.h:28,
from mpsinput.h:25,
from mpsinput.cc:29:
/usr/include/c++/5.1.1/bits/unique_ptr.h:624:5: note: candidate: template<class
_Tp, class _Dp, class _Up, class _Ep> bool std::operator==(const
std::unique_ptr<_Tp, _Dp>&, const std::unique_ptr<_Up, _Ep>&)
operator==(const unique_ptr<_Tp, _Dp>& __x,
...
GCC 4.9 and GCC 6 are OK.
