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Replace M_LOG2E and M_LN2 with custom macros.

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For these to exist we would need to define `_USE_MATH_DEFINES` before
`cmath` or `math.h` is first included.  However, we don't
control the include order for projects outside Eigen, so even defining
the macro in `Eigen/Core` does not fix the issue for projects that
end up including `<cmath>` before Eigen does (explicitly or transitively).

To fix this, we define `EIGEN_LOG2E` and `EIGEN_LN2` ourselves.
This commit is contained in:
Antonio Sanchez
2020-12-11 14:34:31 -08:00
parent e82722a4a7
commit c6efc4e0ba
7 changed files with 13 additions and 11 deletions
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2
Eigen/src/Core/functors/UnaryFunctors.h
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@@ -403,7 +403,7 @@ struct functor_traits<scalar_log10_op<Scalar> >
*/
template<typename Scalar> struct scalar_log2_op {
EIGEN_EMPTY_STRUCT_CTOR(scalar_log2_op)
EIGEN_DEVICE_FUNC inline const Scalar operator() (const Scalar& a) const { return Scalar(M_LOG2E) * std::log(a); }
EIGEN_DEVICE_FUNC inline const Scalar operator() (const Scalar& a) const { return Scalar(EIGEN_LOG2E) * std::log(a); }
template <typename Packet>
EIGEN_DEVICE_FUNC inline Packet packetOp(const Packet& a) const { return internal::plog2(a); }
};