[llvm-bugs] [Bug 48684] error: no return statement in constexpr function for templated MPI_Datatype

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48684

Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Richard Smith <richard-llvm at metafoo.co.uk> ---
The code in question:

template <typename num>
constexpr MPI_Datatype get_mpi_type() {
throw std::logic_error("ERROR: get_mpi_type NOT IMPLEMENTED FOR THIS
DATATYPE");
}

This violates the language rules: no specialization of this function could ever
be used in a constant expression, so a compiler is permitted (but not required)
to diagnose it. Try removing the 'constexpr' from this declaration.

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