Add flang-new to list of Fortran compilers and restrict mpif.h deprecation

Only add the deprecation warning to mpif.h if we compile with flang-new,
which seems to properly handle the `#warning` preprocessor statement.

Signed-off-by: Joseph Schuchart <[email protected]>

Author: devreal

config/ompi_setup_fc.m4

@@ -43,7 +43,7 @@ AC_DEFUN_ONCE([_OMPI_SETUP_FC_COMPILER],[
     # Fortran compilers (excluding the f77 compiler names) from AC's
     # default list of compilers and use it here.  This is the main
     # reason we have an OMPI-ized version of the PROG_FC macro.
-    AC_PROG_FC([gfortran f95 fort xlf95 ifort ifc efc pgfortran pgf95 lf95 f90 xlf90 pgf90 epcf90 nagfor nvfortran])
+    AC_PROG_FC([gfortran flang-new f95 fort xlf95 ifort ifc efc pgfortran pgf95 lf95 f90 xlf90 pgf90 epcf90 nagfor nvfortran])
     FCFLAGS="$ompi_fcflags_save"
     OPAL_VAR_SCOPE_POP
 ])

config/ompi_setup_mpi_fortran.m4

@@ -59,7 +59,10 @@ AC_DEFUN([OMPI_SETUP_MPI_FORTRAN],[
     AC_ARG_ENABLE([deprecate-mpif-h],
                   [AS_HELP_STRING([--enable-deprecate-mpif-h],
                                   [Mark the mpif.h bindings as deprecated (default: enabled)])])
-    if test "$enable_deprecate_mpif_h" = "no"; then
+    if test "x$FC" != "xflang-new"; then
+        AC_MSG_RESULT([no (only for flang-new)])
+        OMPI_FORTRAN_DEPRECATE_MPIF_H=""
+    elif test "$enable_deprecate_mpif_h" = "no"; then
         AC_MSG_RESULT([no])
         OMPI_FORTRAN_DEPRECATE_MPIF_H=""
     else