From 8d45e61f6c421d8e8f7514cd10ed7c979d205b1a Mon Sep 17 00:00:00 2001
From: Tom Deakin <tom.deakin@bristol.ac.uk>
Date: Wed, 11 May 2016 13:20:15 +0100
Subject: [PATCH] Check for OpenACC support by checking the various compiler
 flags

---
 CMakeLists.txt | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 964668e..cd8988d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -37,11 +37,20 @@ else (${OpenCL_FOUND})
   message("Skipping OpenCL...")
 endif (${OpenCL_FOUND})
 
-# TODO: Find OpenACC implementations somehow
-if (true)
+# Check compiler supports an OpenACC flag
+include(CheckCXXCompilerFlag)
+message("${CMAKE_CXX_COMPILER_ID}")
+if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
+  CHECK_CXX_COMPILER_FLAG(-fopenacc OPENACC)
+elseif ("${CMAKE_CXX_COMPILER_ID}" MATCHES "PGI")
+  CHECK_CXX_COMPILER_FLAG(-acc OPENACC)
+elseif ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Cray")
+  CHECK_CXX_COMPILER_FLAG(-hacc=openacc OPENACC)
+endif()
+if (OPENACC)
   add_executable(gpu-stream-acc main.cpp ACCStream.cpp)
   target_compile_definitions(gpu-stream-acc PUBLIC ACC)
-  target_compile_options(gpu-stream-acc PUBLIC "-hstd=c++11")
+  #target_compile_options(gpu-stream-acc PUBLIC "-hstd=c++11")
 else ()
   message("Skipping OpenACC...")
 endif ()