Add new compiler specification for targeting KNL. (#94)

Update coreneuron package to remove -xHost

Author: pramodk

sysconfig/bb5/users/compilers.yaml

@@ -38,6 +38,22 @@ compilers:
       fc: /gpfs/bbp.cscs.ch/apps/compilers/install/intel-18.0.1/compilers_and_libraries_2018.1.163/linux/bin/intel64/ifort
     spec: intel@18.0.1
     target: x86_64
+- compiler:
+    environment: {}
+    extra_rpaths: []
+    flags:
+      cflags: -xMIC-AVX512
+      cxxflags: -xMIC-AVX512
+      cppflags: -xMIC-AVX512
+    modules: []
+    operating_system: rhel7
+    paths:
+      cc: /gpfs/bbp.cscs.ch/apps/compilers/install/intel-18.0.1/compilers_and_libraries_2018.1.163/linux/bin/intel64/icc
+      cxx: /gpfs/bbp.cscs.ch/apps/compilers/install/intel-18.0.1/compilers_and_libraries_2018.1.163/linux/bin/intel64/icpc
+      f77: /gpfs/bbp.cscs.ch/apps/compilers/install/intel-18.0.1/compilers_and_libraries_2018.1.163/linux/bin/intel64/ifort
+      fc: /gpfs/bbp.cscs.ch/apps/compilers/install/intel-18.0.1/compilers_and_libraries_2018.1.163/linux/bin/intel64/ifort
+    spec: intel@18.0.1
+    target: x86_64_knl
 - compiler:
     environment: {}
     extra_rpaths: []

var/spack/repos/builtin/packages/coreneuron/package.py

@@ -79,7 +79,7 @@ def get_flags(self):
         if 'bgq' in spec.architecture and '%xl' in spec:
             flags = '-O3 -qtune=qp -qarch=qp -q64 -qhot=simd -qsmp -qthreaded -g'
         if '%intel' in spec:
-            flags = '-g -xHost -O2 -qopt-report=5'
+            flags = '-g -O2 -qopt-report=5'
             if '+knl' in spec:
                 flags = '-g -xMIC-AVX512 -O2 -qopt-report=5'
         if '+gpu' in spec: