Remove Cray flags for OpenACC following removal of support in latest compiler

CHANGELOG.md

@@ -15,6 +15,7 @@ All notable changes to this project will be documented in this file.
 ### Removed
 - Pre-building of kernels in SYCL version to ensure compatibility with SYCL 1.2.1.
   Pre-building kernels is also not required, and shows no overhead as the first iteration is not timed.
+- OpenACC Cray compiler flags.
 
 ## [v3.4] - 2019-04-10
 

OpenACC.make

@@ -3,14 +3,13 @@ ifndef COMPILER
 define compiler_help
 Set COMPILER to ensure correct flags are set.
 Available compilers are:
-  PGI CRAY GNU
+  PGI GNU
 endef
 $(info $(compiler_help))
 endif
 
 COMPILER_ = $(CXX)
 COMPILER_PGI = pgc++
-COMPILER_CRAY = CC
 COMPILER_GNU = g++
 
 FLAGS_ = -O3 -std=c++11
@@ -48,7 +47,6 @@ FLAGS_PGI += $(TARGET_FLAGS_$(TARGET))
 
 endif
 
-FLAGS_CRAY = -hstd=c++11
 FLAGS_GNU = -O3 -std=c++11 -Drestrict=__restrict -fopenacc
 CXXFLAGS = $(FLAGS_$(COMPILER))