[cfe-dev] libc++ and const expr.

[Jean-Daniel Dupas]

Hi,

Am I the only one having trouble compiling libc++ with clang TOT.
For sometime now, clang refuse to compile (and use it) because of the following issue:

../include/ratio:193:19: error: static_assert expression is not an integral constant expression
    static_assert(_Xp != nan && _Yp != nan && __a_x <= max / __a_y, "overflow in __ll_mul");
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../include/ratio:308:13: note: in instantiation of template class 'std::__1::__ll_mul<1, 1>' requested here
            __ll_mul<_R1::num / __gcd_n1_n2, _R2::den / __gcd_d1_d2>::value,
            ^
../include/ratio:315:33: note: in instantiation of template class 'std::__1::__ratio_divide<std::__1::ratio<1, 1000000000>, std::__1::ratio<1, 1000000000> >' requested
      here
template <class _R1, class _R2> using ratio_divide
                                ^
../include/chrono:410:18: note: in instantiation of template type alias 'ratio_divide' requested here
                (ratio_divide<_Period2, period>::type::den == 1 &&
                 ^
../include/chrono:406:9: note: while substituting deduced template arguments into function template 'duration' [with _Rep2 = long long, _Period2 = <no value>]
        duration(const duration<_Rep2, _Period2>& __d,
        ^
../include/ratio:193:26: note: initializer of 'nan' is not a constant expression
    static_assert(_Xp != nan && _Yp != nan && __a_x <= max / __a_y, "overflow in __ll_mul");
                         ^
../include/ratio:187:27: note: declared here
    static const intmax_t nan = (1LL << (sizeof(intmax_t) * CHAR_BIT - 1));
                          ^
../include/ratio:187:27: note: declared here
../include/ratio:189:27: note: declared here
    static const intmax_t max = -min;

-- Jean-Daniel




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