Compiler error with -std=c++17 on clang

[jarnoharno]

error.cpp:

#define SIMDPP_ARCH_X86_SSE2
#include "simdpp/simd.h"

Compiling with

$ clang++ -std=c++17 -c -I libsimdpp error.cpp

produces the following error:

In file included from error.cpp:3:
In file included from libsimdpp/simdpp/simd.h:19:
In file included from libsimdpp/simdpp/core/align.h:15:
In file included from libsimdpp/simdpp/types.h:44:
libsimdpp/simdpp/types/empty_expr.h:220:52: error: no viable conversion from returned value
      of type 'const mask_int32<4U>' to function return type 'uint32<4U>'
    SIMDPP_INL operator uint32<N>() const { return e; }
                                                   ^
libsimdpp/simdpp/detail/insn/cmp_neq.h:195:21: note: in instantiation of member function
      'simdpp::arch_sse2::mask_int32<4, simdpp::arch_sse2::expr_empty>::operator uint32'
      requested here
    r32 = (uint32x4)cmp_eq(uint32x4(a), uint32x4(b));
                    ^
libsimdpp/simdpp/types/int32x4.h:123:16: note: candidate constructor not viable: no known
      conversion from 'const mask_int32<4U>' to 'const uint32<4> &' for 1st argument
    SIMDPP_INL uint32<4>(const uint32<4> &) = default;
               ^
libsimdpp/simdpp/types/int32x4.h:138:16: note: candidate constructor not viable: no known
      conversion from 'const mask_int32<4U>' to 'const simdpp::arch_sse2::uint32<4,
      void>::native_type &' (aka 'const __m128i &') for 1st argument
    SIMDPP_INL uint32<4>(const native_type& d) : d_(d) {}
               ^
libsimdpp/simdpp/types/int32x4.h:126:34: note: candidate template ignored: could not match
      'uint32' against 'mask_int32'
    template<class E> SIMDPP_INL uint32<4>(const uint32<4,E>& d) { *this = d.eval(); }
                                 ^
libsimdpp/simdpp/types/int32x4.h:127:34: note: candidate template ignored: could not match
      'int32' against 'mask_int32'
    template<class E> SIMDPP_INL uint32<4>(const int32<4,E>& d) { *this = d.eval(); }
                                 ^
libsimdpp/simdpp/types/int32x4.h:148:34: note: candidate template ignored: could not match
      'expr_vec_construct' against 'mask_int32'
    template<class E> SIMDPP_INL uint32<4>(const expr_vec_construct<E>& e)
                                 ^
libsimdpp/simdpp/types/int32x4.h:221:16: note: candidate function
    SIMDPP_INL operator native_type() const SIMDPP_IMPLICIT_CONVERSION_DEPRECATION_MSG
               ^
1 error generated.

The compiler version is Apple LLVM version 10.0.1 (clang-1001.0.46.4)

Compiling with c++11 or c++14 work ok.

[peabody-korg]

same issue here (same version of clang). this will block us from moving to C++17 until this is resolved.