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

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

            Bug ID: 48684
           Summary: error: no return statement in constexpr function for
                    templated MPI_Datatype
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++14
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rai.deepali07 at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Created attachment 24356
  --> https://bugs.llvm.org/attachment.cgi?id=24356&action=edit
test.out.cpp with mpi.h included in it.

Attached test case when compiled with clang++, gives this error:

test.cpp:5:24: error: no return statement in constexpr function
constexpr MPI_Datatype get_mpi_type() {
                       ^
test.cpp:10:24: error: no function template matches function template
specialization 'get_mpi_type'
constexpr MPI_Datatype get_mpi_type<float>() {
                       ^
test.cpp:5:24: note: candidate template ignored: substitution failure [with num
= float]
constexpr MPI_Datatype get_mpi_type() {
                       ^
test.cpp:15:14: error: no function template matches function template
specialization 'get_mpi_type'
MPI_Datatype get_mpi_type<double>() {
             ^
test.cpp:5:24: note: candidate template ignored: substitution failure [with num
= double]
constexpr MPI_Datatype get_mpi_type() {
                       ^
3 errors generated.

If any once has any idea on this issue please let me know.

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