Add XL compiler support to OpenMP and RAJA makefiles

OpenMP.make

@@ -3,7 +3,7 @@ ifndef COMPILER
 define compiler_help
 Set COMPILER to change flags (defaulting to GNU).
 Available compilers are:
-  CLANG CRAY GNU INTEL
+  CLANG CRAY GNU INTEL XL
 
 endef
 $(info $(compiler_help))
@@ -25,12 +25,14 @@ COMPILER_GNU = g++
 COMPILER_INTEL = icpc
 COMPILER_CRAY = CC
 COMPILER_CLANG = clang++
+COMPILER_XL = xlc++
 CXX = $(COMPILER_$(COMPILER))
 
 FLAGS_GNU = -O3 -std=c++11
 FLAGS_INTEL = -O3 -std=c++11 -xHOST
 FLAGS_CRAY = -O3 -hstd=c++11
 FLAGS_CLANG = -O3 -std=c++11
+FLAGS_XL = -O5 -qarch=pwr8 -qtune=pwr8 -std=c++11
 CXXFLAGS = $(FLAGS_$(COMPILER))
 
 # OpenMP flags for CPUs
@@ -38,6 +40,7 @@ OMP_GNU_CPU   = -fopenmp
 OMP_INTEL_CPU = -qopenmp
 OMP_CRAY_CPU  = -homp
 OMP_CLANG_CPU = -fopenmp=libomp
+OMP_XL_CPU = -qsmp=omp -qthreaded
 
 # OpenMP flags for NVIDIA
 OMP_CRAY_NVIDIA  = -DOMP_TARGET_GPU

RAJA.make

@@ -12,25 +12,28 @@ endif
 
 ifeq ($(TARGET), CPU)
 COMP=$(CXX)
-CXXFLAGS = -O3 -std=c++11 -DRAJA_TARGET_CPU
+CXXFLAGS = -DRAJA_TARGET_CPU
 
 ifndef COMPILER
 define compiler_help
 Set COMPILER to ensure correct OpenMP flags are set.
 Available compilers are:
-  INTEL GNU CRAY
+  INTEL GNU CRAY XL
 endef
 $(info $(compiler_help))
 endif
 ifeq ($(COMPILER), INTEL)
 COMP = icpc
-CXXFLAGS += -qopenmp
+CXXFLAGS += -O3 -std=c++11 -qopenmp
 else ifeq ($(COMPILER), GNU)
 COMP = g++
-CXXFLAGS += -fopenmp
+CXXFLAGS += -O3 -std=c++11 -fopenmp
 else ifeq ($(COMPILER), CRAY)
 COMP = CC
-CXXFLAGS +=
+CXXFLAGS += -O3 -hstd=c++11
+else ifeq ($(COMPILER), XL)
+COMP = xlc++
+CXXFLAGS += -O5 -std=c++11 -qarch=pwr8 -qtune=pwr8 -qsmp=omp -qthreaded
 endif
 
 else ifeq ($(TARGET), GPU)