Add Intel LLVM to Intel.yml CI

.github/workflows/Intel.yml

@@ -1,6 +1,6 @@
 # This is a CI workflow for the NCEPLIBS-ip project.
 #
-# This workflow builds with the Intel compiler.
+# This workflow builds with the Intel Classic and OneAPI compilers.
 #
 # Ed Hartnett, 1/8/23
 name: Intel
@@ -21,13 +21,10 @@ defaults:
 jobs:
   Intel:
     runs-on: ubuntu-latest
-    env:
-      CC: icc
-      FC: ifort
-      CXX: icpc
     strategy:
       matrix:
         openmp: [ ON, OFF ]
+        compilers: ["CC=icc FC=ifort", "CC=icx FC=ifx"]
 
     steps:
 
@@ -64,7 +61,7 @@ jobs:
         cd sp
         mkdir build
         cd build
-        cmake -DCMAKE_INSTALL_PREFIX=~/sp -DOPENMP=${{ matrix.openmp}} ..
+        ${{ matrix.compilers }} cmake -DCMAKE_INSTALL_PREFIX=~/sp -DOPENMP=${{ matrix.openmp}} ..
         make -j2
         make install
 
@@ -78,7 +75,7 @@ jobs:
         cd ip
         mkdir build 
         cd build
-        cmake -DOPENMP=${{ matrix.openmp }} -DBUILD_SHARED_LIBS=OFF -DCMAKE_PREFIX_PATH="~/sp" ..
+        ${{ matrix.compilers }} cmake -DOPENMP=${{ matrix.openmp }} -DBUILD_SHARED_LIBS=OFF -DCMAKE_PREFIX_PATH="~/sp" ..
         make -j2 VERBOSE=1
     
     - name: test