print information about serial/parallel and MPI version for known libraries

src/lammps.cpp

@@ -978,9 +978,25 @@ void print_style(FILE *fp, const char *str, int &pos)
   }
 }
 
+#define lmp_str(s) #s
+#define lmp_xstr(s) lmp_str(s)
+
 static const char lammps_config_options[]
 = "LAMMPS compile time settings:\n\n"
-  "Integer sizes setting:    "
+  "MPI library setting:       "
+#if defined(MPI_STUBS)
+  "Serial version using STUBS"
+#elif defined(MPICH_VERSION)
+  "Parallel version using MPICH " MPICH_VERSION
+#elif defined(OPEN_MPI)
+  "Parallel version using OpenMPI "
+  lmp_xstr(OMPI_MAJOR_VERSION) "."
+  lmp_xstr(OMPI_MINOR_VERSION) "."
+  lmp_xstr(OMPI_RELEASE_VERSION)
+#else
+ "Parallel version using unknown MPI library"
+#endif
+  "\nInteger sizes setting:    "
 #if defined(LAMMPS_SMALLSMALL)
   " -DLAMMPS_SMALLSMALL"
 #elif defined(LAMMPS_SMALLBIG)
@@ -1019,8 +1035,6 @@ static const char lammps_config_options[]
 #endif
   "\nMemory alignment:         "
 #if defined(LAMMPS_MEMALIGN)
-#define lmp_str(s) #s
-#define lmp_xstr(s) lmp_str(s)
   " -DLAMMPS_MEMALIGN=" lmp_xstr(LAMMPS_MEMALIGN)
 #else
   " (default)"