From b66d4739b5e0944a58d4a94431ed7ad042fad05d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matth=C3=A4us=20G=2E=20Chajdas?= <cmake@anteru.net>
Date: Tue, 31 May 2016 21:10:40 +0200
Subject: [PATCH] FindOpenCL: Add an imported target

---
 .../dev/FindOpenCL-imported-target.rst        |  4 ++++
 Modules/FindOpenCL.cmake                      | 20 +++++++++++++++++--
 Tests/CMakeLists.txt                          |  4 ++++
 Tests/FindOpenCL/CMakeLists.txt               | 10 ++++++++++
 Tests/FindOpenCL/Test/CMakeLists.txt          | 14 +++++++++++++
 Tests/FindOpenCL/Test/main.c                  | 16 +++++++++++++++
 6 files changed, 66 insertions(+), 2 deletions(-)
 create mode 100644 Help/release/dev/FindOpenCL-imported-target.rst
 create mode 100644 Tests/FindOpenCL/CMakeLists.txt
 create mode 100644 Tests/FindOpenCL/Test/CMakeLists.txt
 create mode 100644 Tests/FindOpenCL/Test/main.c

diff --git a/Help/release/dev/FindOpenCL-imported-target.rst b/Help/release/dev/FindOpenCL-imported-target.rst
new file mode 100644
index 000000000..259c745b0
--- /dev/null
+++ b/Help/release/dev/FindOpenCL-imported-target.rst
@@ -0,0 +1,4 @@
+FindOpenCL-imported-target
+--------------------------
+
+* The :module:`FindOpenCL` module now provides imported targets.
diff --git a/Modules/FindOpenCL.cmake b/Modules/FindOpenCL.cmake
index 4d3ed842c..feda31565 100644
--- a/Modules/FindOpenCL.cmake
+++ b/Modules/FindOpenCL.cmake
@@ -4,7 +4,16 @@
 #
 # Try to find OpenCL
 #
-# Once done this will define::
+# IMPORTED Targets
+# ^^^^^^^^^^^^^^^^
+#
+# This module defines :prop_tgt:`IMPORTED` target ``OpenCL::OpenCL``, if
+# OpenCL has been found.
+#
+# Result Variables
+# ^^^^^^^^^^^^^^^^
+#
+# This module defines the following variables::
 #
 #   OpenCL_FOUND          - True if OpenCL was found
 #   OpenCL_INCLUDE_DIRS   - include directories for OpenCL
@@ -20,7 +29,7 @@
 #
 
 #=============================================================================
-# Copyright 2014 Matthaeus G. Chajdas
+# Copyright 2014-2016 Matthaeus G. Chajdas
 #
 # Distributed under the OSI-approved BSD License (the "License");
 # see accompanying file Copyright.txt for details.
@@ -134,3 +143,10 @@ find_package_handle_standard_args(
 mark_as_advanced(
   OpenCL_INCLUDE_DIR
   OpenCL_LIBRARY)
+
+if(OpenCL_FOUND AND NOT TARGET OpenCL::OpenCL)
+  add_library(OpenCL::OpenCL UNKNOWN IMPORTED)
+  set_target_properties(OpenCL::OpenCL PROPERTIES
+    IMPORTED_LOCATION "${OpenCL_LIBRARY}"
+    INTERFACE_INCLUDE_DIRECTORIES "${OpenCL_INCLUDE_DIRS}")
+endif()
diff --git a/Tests/CMakeLists.txt b/Tests/CMakeLists.txt
index 2db5deda3..b72ecf5da 100644
--- a/Tests/CMakeLists.txt
+++ b/Tests/CMakeLists.txt
@@ -1378,6 +1378,10 @@ ${CMake_BINARY_DIR}/bin/cmake -DDIR=dev -P ${CMake_SOURCE_DIR}/Utilities/Release
     add_subdirectory(FindLTTngUST)
   endif()
 
+  if(CMake_TEST_FindOpenCL)
+    add_subdirectory(FindOpenCL)
+  endif()
+
   if(CMake_TEST_FindOpenSSL)
     add_subdirectory(FindOpenSSL)
   endif()
diff --git a/Tests/FindOpenCL/CMakeLists.txt b/Tests/FindOpenCL/CMakeLists.txt
new file mode 100644
index 000000000..88d2eaee0
--- /dev/null
+++ b/Tests/FindOpenCL/CMakeLists.txt
@@ -0,0 +1,10 @@
+add_test(NAME FindOpenCL.Test COMMAND
+  ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+  --build-and-test
+  "${CMake_SOURCE_DIR}/Tests/FindOpenCL/Test"
+  "${CMake_BINARY_DIR}/Tests/FindOpenCL/Test"
+  ${build_generator_args}
+  --build-project TestFindOpenCL
+  --build-options ${build_options}
+  --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
+  )
diff --git a/Tests/FindOpenCL/Test/CMakeLists.txt b/Tests/FindOpenCL/Test/CMakeLists.txt
new file mode 100644
index 000000000..f8a65877b
--- /dev/null
+++ b/Tests/FindOpenCL/Test/CMakeLists.txt
@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.4)
+project(TestFindOpenCL C)
+include(CTest)
+
+find_package(OpenCL REQUIRED)
+
+add_executable(test_tgt main.c)
+target_link_libraries(test_tgt OpenCL::OpenCL)
+add_test(NAME test_tgt COMMAND test_tgt)
+
+add_executable(test_var main.c)
+target_include_directories(test_var PRIVATE ${OpenCL_INCLUDE_DIRS})
+target_link_libraries(test_var PRIVATE ${OpenCL_LIBRARIES})
+add_test(NAME test_var COMMAND test_var)
diff --git a/Tests/FindOpenCL/Test/main.c b/Tests/FindOpenCL/Test/main.c
new file mode 100644
index 000000000..b075caf19
--- /dev/null
+++ b/Tests/FindOpenCL/Test/main.c
@@ -0,0 +1,16 @@
+#ifdef __APPLE__
+  #include <OpenCL/opencl.h>
+#else
+  #include <CL/cl.h>
+#endif
+
+int main()
+{
+  cl_uint platformIdCount;
+
+  // We can't assert on the result because this may return an error if no ICD is
+  // found
+  clGetPlatformIDs (0, NULL, &platformIdCount);
+
+  return 0;
+}