MPI C++ Datatypes: don't declare/define if no C++ support

Per MPI-3.1 A.1.1 p674, only define the C++ datatypes if we're
actually building C++ support.

Signed-off-by: Jeff Squyres <[email protected]>

Author: jsquyres

ompi/include/mpi.h.in

@@ -9,7 +9,7 @@
  *                         University of Stuttgart.  All rights reserved.
  * Copyright (c) 2004-2005 The Regents of the University of California.
  *                         All rights reserved.
- * Copyright (c) 2007-2014 Cisco Systems, Inc.  All rights reserved.
+ * Copyright (c) 2007-2016 Cisco Systems, Inc.  All rights reserved.
  * Copyright (c) 2008-2009 Sun Microsystems, Inc.  All rights reserved.
  * Copyright (c) 2009-2012 Oak Rigde National Laboratory.  All rights reserved.
  * Copyright (c) 2011      Sandia National Laboratories. All rights reserved.
@@ -941,13 +941,17 @@ OMPI_DECLSPEC extern struct ompi_predefined_datatype_t ompi_mpi_long_double;
 OMPI_DECLSPEC extern struct ompi_predefined_datatype_t ompi_mpi_wchar;
 OMPI_DECLSPEC extern struct ompi_predefined_datatype_t ompi_mpi_packed;
 
+/* Per MPI-3.1 A.1.1 p674, only define the C++ datatypes if we're
+   actually building C++ support */
+#if defined(OMPI_BUILD_CXX_BINDINGS) && OMPI_BUILD_CXX_BINDINGS
 /*
  * Following are the C++/C99 datatypes
  */
 OMPI_DECLSPEC extern struct ompi_predefined_datatype_t ompi_mpi_cxx_bool;
 OMPI_DECLSPEC extern struct ompi_predefined_datatype_t ompi_mpi_cxx_cplex;
 OMPI_DECLSPEC extern struct ompi_predefined_datatype_t ompi_mpi_cxx_dblcplex;
 OMPI_DECLSPEC extern struct ompi_predefined_datatype_t ompi_mpi_cxx_ldblcplex;
+#endif
 
 /*
  * Following are the Fortran datatypes
@@ -1162,10 +1166,15 @@ OMPI_DECLSPEC extern MPI_Fint *MPI_F_STATUSES_IGNORE;
 #if HAVE_LONG_DOUBLE__COMPLEX
 #define MPI_C_LONG_DOUBLE_COMPLEX OMPI_PREDEFINED_GLOBAL(MPI_Datatype, ompi_mpi_c_long_double_complex)
 #endif
+
+/* Per MPI-3.1 A.1.1 p674, only define the C++ datatypes if we're
+   actually building C++ support */
+#if defined(OMPI_BUILD_CXX_BINDINGS) && OMPI_BUILD_CXX_BINDINGS
 #define MPI_CXX_BOOL              OMPI_PREDEFINED_GLOBAL(MPI_Datatype, ompi_mpi_cxx_bool)
 #define MPI_CXX_FLOAT_COMPLEX     OMPI_PREDEFINED_GLOBAL(MPI_Datatype, ompi_mpi_cxx_cplex)
 #define MPI_CXX_DOUBLE_COMPLEX    OMPI_PREDEFINED_GLOBAL(MPI_Datatype, ompi_mpi_cxx_dblcplex)
 #define MPI_CXX_LONG_DOUBLE_COMPLEX OMPI_PREDEFINED_GLOBAL(MPI_Datatype, ompi_mpi_cxx_ldblcplex)
+#endif
 
 /* New datatypes from the 3.0 standard */
 #define MPI_COUNT                 OMPI_PREDEFINED_GLOBAL(MPI_Datatype, ompi_mpi_count)