From 1fcaaf460fc4d3a78a42619005a1fb5c4a3dd6ca Mon Sep 17 00:00:00 2001
From: Thales Sabino <thales@codeplay.com>
Date: Fri, 5 Jun 2020 14:04:22 +0100
Subject: Update FindComputeCpp.cmake to fix build problems on Windows

- Use standard types in SYCL/PacketMath.h to avoid compilation problems on Windows
- Add EIGEN_HAS_CONSTEXPR to cxx11_tensor_argmax_sycl.cpp to fix build problems on Windows
---
 cmake/ComputeCppCompilerChecks.cmake | 50 ++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 cmake/ComputeCppCompilerChecks.cmake

(limited to 'cmake/ComputeCppCompilerChecks.cmake')

diff --git a/cmake/ComputeCppCompilerChecks.cmake b/cmake/ComputeCppCompilerChecks.cmake
new file mode 100644
index 000000000..1807485e4
--- /dev/null
+++ b/cmake/ComputeCppCompilerChecks.cmake
@@ -0,0 +1,50 @@
+cmake_minimum_required(VERSION 3.4.3)
+
+if(CMAKE_COMPILER_IS_GNUCXX)
+  if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8)
+    message(FATAL_ERROR "host compiler - gcc version must be > 4.8")
+  endif()
+elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+  if (${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS 3.6)
+    message(FATAL_ERROR "host compiler - clang version must be > 3.6")
+  endif()
+endif()
+
+if(MSVC)
+  set(ComputeCpp_STL_CHECK_SRC __STL_check)
+  file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/${ComputeCpp_STL_CHECK_SRC}.cpp
+    "#include <ios>\n"
+    "int main() { return 0; }\n")
+  execute_process(
+    COMMAND ${ComputeCpp_DEVICE_COMPILER_EXECUTABLE}
+            ${COMPUTECPP_DEVICE_COMPILER_FLAGS}
+            -isystem ${ComputeCpp_INCLUDE_DIRS}
+            -o ${ComputeCpp_STL_CHECK_SRC}.sycl
+            -c ${ComputeCpp_STL_CHECK_SRC}.cpp
+    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+    RESULT_VARIABLE ComputeCpp_STL_CHECK_RESULT
+    ERROR_QUIET
+    OUTPUT_QUIET)
+  if(NOT ${ComputeCpp_STL_CHECK_RESULT} EQUAL 0)
+    # Try disabling compiler version checks
+    execute_process(
+      COMMAND ${ComputeCpp_DEVICE_COMPILER_EXECUTABLE}
+              ${COMPUTECPP_DEVICE_COMPILER_FLAGS}
+              -D_ALLOW_COMPILER_AND_STL_VERSION_MISMATCH
+              -isystem ${ComputeCpp_INCLUDE_DIRS}
+              -o ${ComputeCpp_STL_CHECK_SRC}.cpp.sycl
+              -c ${ComputeCpp_STL_CHECK_SRC}.cpp
+      WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+      RESULT_VARIABLE ComputeCpp_STL_CHECK_RESULT
+      ERROR_QUIET
+      OUTPUT_QUIET)
+    if(NOT ${ComputeCpp_STL_CHECK_RESULT} EQUAL 0)
+      message(STATUS "Device compiler cannot consume hosted STL headers. Using any parts of the STL will likely result in device compiler errors.")
+    else()
+    message(STATUS "Device compiler does not meet certain STL version requirements. Disabling version checks and hoping for the best.")
+      list(APPEND COMPUTECPP_DEVICE_COMPILER_FLAGS -D_ALLOW_COMPILER_AND_STL_VERSION_MISMATCH)
+    endif()
+  endif()
+  file(REMOVE ${CMAKE_CURRENT_BINARY_DIR}/${ComputeCpp_STL_CHECK_SRC}.cpp
+              ${CMAKE_CURRENT_BINARY_DIR}/${ComputeCpp_STL_CHECK_SRC}.cpp.sycl)
+endif(MSVC)
-- 
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