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Subject: [Bug c++/105482] New: Regression with `>=` in a template argument
Date: Wed, 04 May 2022 15:12:14 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105482

            Bug ID: 105482
           Summary: Regression with `>=3D` in a template argument
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pdimov at gmail dot com
  Target Milestone: ---

The current GCC trunk in C++11 or C++14 mode gives an error when including
boost/mp11/algorithm.hpp (from Boost 1.79):

opt/compiler-explorer/libs/boost_1_79_0/boost/mp11/algorithm.hpp:445:102:
error: '>=3D' should be '> =3D' to terminate a template argument list
  445 | struct mp_take_c_impl<N, L<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10,
T...>, typename std::enable_if<N >=3D 10>::type>
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
                             ^~
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
                             > =3D
/opt/compiler-explorer/libs/boost_1_79_0/boost/mp11/algorithm.hpp:445:107:
error: template argument 3 is invalid
  445 | struct mp_take_c_impl<N, L<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10,
T...>, typename std::enable_if<N >=3D 10>::type>
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
                                  ^
/opt/compiler-explorer/libs/boost_1_79_0/boost/mp11/algorithm.hpp:445:114:
error: expected unqualified-id before '>' token
  445 | struct mp_take_c_impl<N, L<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10,
T...>, typename std::enable_if<N >=3D 10>::type>
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
                                         ^

See e.g. https://godbolt.org/z/nE9754and and
https://github.com/boostorg/mp11/issues/73.

GCC 11 works, as does trunk in C++17 mode or later.=