Limit POWERPC DYNAMIC_CORE list to P8 and P9 for NVIDIA compilers

Makefile.system

@@ -663,6 +663,7 @@ endif
 endif # ARCH zarch
 
 ifeq ($(ARCH), power)
+ifneq ($(C_COMPILER), PGI)
 DYNAMIC_CORE = POWER6
 DYNAMIC_CORE += POWER8
 ifneq ($(C_COMPILER), GCC)
@@ -689,6 +690,10 @@ else
 $(info, OpenBLAS: Your gcc version is too old to build the POWER10 kernels.)
 endif
 endif
+else
+DYNAMIC_CORE = POWER8
+DYNAMIC_CORE += POWER9
+endif
 endif
 
 # If DYNAMIC_CORE is not set, DYNAMIC_ARCH cannot do anything, so force it to empty
@@ -1039,12 +1044,18 @@ ifeq ($(ARCH), x86_64)
 FCOMMON_OPT += -tp p7-64
 else
 ifeq ($(ARCH), power)
+ifeq ($(CORE), POWER6)
+$(warning NVIDIA HPC compilers do not support POWER6.)
+endif
 ifeq ($(CORE), POWER8)
 FCOMMON_OPT += -tp pwr8
 endif
 ifeq ($(CORE), POWER9)
 FCOMMON_OPT += -tp pwr9
 endif
+ifeq ($(CORE), POWER10)
+$(warning NVIDIA HPC compilers do not support POWER10.)
+endif
 endif
 endif
 else