add compilation stanza for Intel oneAPI for 4.5.2 (#1946)

TYPE: enhancement

KEYWORDS: Intel, LLVM, oneAPI, compilation

SOURCE: internal

DESCRIPTION OF CHANGES:
Problem:
Addressing issue #1884 for Intel oneAPI ifx/icx builds

Solution:
Add configuration to configure.defaults mirroring original Intel ifort/icc build with minor tweaking.

ISSUE: For use when this PR closes an issue.
Fixes #1884

LIST OF MODIFIED FILES:
M arch/configure.defaults

TESTS CONDUCTED:

1. WRF core em_real compiles with ifx/icx in combination with PR-1823.
2. The Jenkins tests are all passing.
Note that this is the same PR as in #1893, but committed to release-v4.5.2 branch (instead of develop)

RELEASE NOTE: Added build configuration for new Intel oneAPI LLVM ifx/icx compilers, which will be available on NCAR's new computer, Derecho.

arch/configure.defaults

@@ -2124,6 +2124,52 @@ NETCDFPAR_BUILD = CONFIGURE_NETCDFPAR_BUILD
 
 #insert new stanza here
 
+###########################################################
+#ARCH Linux x86_64 ppc64le i486 i586 i686, Intel oneAPI compiler with icx #serial smpar dmpar dm+sm
+# This mirrors the above Intel build but changes ifort=>ifx icc=>icx
+
+DESCRIPTION = INTEL ($SFC/$SCC) : oneAPI LLVM
+DMPARALLEL = # 1
+OMPCPP = # -D_OPENMP
+OMP = # -qopenmp -fpp -auto
+OMPCC = # -qopenmp -auto
+SFC = ifx
+SCC = icx
+CCOMP = icx
+DM_FC = mpif90 -f90=$(SFC)
+DM_CC = mpicc -cc=$(SCC)
+FC = CONFIGURE_FC
+CC = CONFIGURE_CC
+LD = $(FC)
+RWORDSIZE = CONFIGURE_RWORDSIZE
+PROMOTION = -real-size `expr 8 \* $(RWORDSIZE)` -i4
+ARCH_LOCAL = -DNONSTANDARD_SYSTEM_FUNC CONFIGURE_D_CTSM
+CFLAGS_LOCAL = -w -O3 -ip #-xHost -fp-model fast=2 -no-prec-div -no-prec-sqrt -ftz -no-multibyte-chars # -DRSL0_ONLY
+LDFLAGS_LOCAL = -ip #-xHost -fp-model fast=2 -no-prec-div -no-prec-sqrt -ftz -align all -fno-alias -fno-common
+CPLUSPLUSLIB =
+ESMF_LDFLAG = $(CPLUSPLUSLIB)
+FCOPTIM = -O3
+FCREDUCEDOPT = $(FCOPTIM)
+FCNOOPT = -O0 -fno-inline -no-ip
+FCDEBUG = # -g $(FCNOOPT) -traceback # -fpe0 -check noarg_temp_created,bounds,format,output_conversion,pointers,uninit -ftrapuv -unroll0 -u
+FORMAT_FIXED = -FI
+FORMAT_FREE = -FR
+FCSUFFIX =
+BYTESWAPIO = -convert big_endian
+RECORDLENGTH = -assume byterecl
+FCBASEOPTS_NO_G = -ip -fp-model precise -w -ftz -align all -fno-alias $(FORMAT_FREE) $(BYTESWAPIO) #-xHost -fp-model fast=2 -no-heap-arrays -no-prec-div -no-prec-sqrt -fno-common
+FCBASEOPTS = $(FCBASEOPTS_NO_G) $(FCDEBUG)
+MODULE_SRCH_FLAG =
+TRADFLAG = CONFIGURE_TRADFLAG
+CPP = /lib/cpp CONFIGURE_CPPFLAGS
+AR = ar
+ARFLAGS = ru
+M4 = m4
+RANLIB = ranlib
+RLFLAGS =
+CC_TOOLS = $(SCC)
+NETCDFPAR_BUILD = CONFIGURE_NETCDFPAR_BUILD
+
 ###########################################################
 #ARCH Linux aarch64, GCC compiler OpenMPI # serial smpar dmpar dm+sm
 #