Use plaidml cmake config (#2290)

* Use plaidml cmake config

* Require PlaidML if requested

* Don't install libplaidml

We can assume that it's correctly installed on the target, especially
since it needs to be correctly installed in order to find its
configuration files.

CMakeLists.txt

@@ -108,7 +108,7 @@ option(NGRAPH_GPUH_ENABLE "Control the building of the Hybrid GPU backend" FALSE
 option(NGRAPH_DISTRIBUTED_ENABLE "Add distributed mode to the CPU backend" FALSE)
 option(NGRAPH_DEBUG_ENABLE "Enable output for NGRAPH_DEBUG statements" FALSE)
 option(NGRAPH_ONNX_IMPORT_ENABLE "Enable ONNX importer" FALSE)
-option(NGRAPH_DEX_ONLY "Build CPU or GPU DEX without codegen" FALSE)
+option(NGRAPH_DEX_ONLY "Build CPU DEX without codegen" FALSE)
 option(NGRAPH_CODE_COVERAGE_ENABLE "Enable code coverage data collection" FALSE)
 option(NGRAPH_LIB_VERSIONING_ENABLE "Enable shared library versioning" FALSE)
 option(NGRAPH_PYTHON_BUILD_ENABLE   "Enable build nGraph python package wheel" FALSE)
@@ -139,7 +139,17 @@ if (NGRAPH_ONNX_IMPORT_ENABLE)
     option(NGRAPH_ONNXIFI_ENABLE "Enable ONNX Interface for Framework Integration" TRUE)
 endif()
 
-option(NGRAPH_PLAIDML_ENABLE "Enable the PlaidML backend" FALSE)
+find_package(PlaidML CONFIG)
+
+option(NGRAPH_PLAIDML_ENABLE "Enable the PlaidML backend" ${PLAIDML_FOUND})
+
+if (NGRAPH_PLAIDML_ENABLE)
+    if (NOT PLAIDML_FOUND)
+        message(FATAL_ERROR "PlaidML not installed")
+    endif()
+endif()
+
+message(STATUS "NGRAPH_PLAIDML_ENABLE:        ${NGRAPH_PLAIDML_ENABLE}")
 
 #-----------------------------------------------------------------------------------------------
 # Installation logic...

src/ngraph/runtime/CMakeLists.txt

@@ -37,4 +37,6 @@ if (NGRAPH_GPUH_ENABLE)
     add_subdirectory(gpuh)
 endif()
 
-add_subdirectory(plaidml)
+if (NGRAPH_PLAIDML_ENABLE)
+    add_subdirectory(plaidml)
+endif()

src/ngraph/runtime/plaidml/CMakeLists.txt

@@ -60,25 +60,16 @@ set(SRC
     plaidml_translate.cpp
 )
 
-if (NGRAPH_PLAIDML_ENABLE)
-    find_package(PlaidML CONFIG REQUIRED)
-    message(STATUS "PlaidML enabled")
-
-    add_library(libplaidml INTERFACE)
-    target_link_libraries(libplaidml INTERFACE ${PLAIDML_LIBRARIES})
-    install(FILES ${PLAIDML_LIBRARIES} DESTINATION ${NGRAPH_INSTALL_LIB})
-
-    add_library(plaidml_backend SHARED ${SRC})
-    if(NGRAPH_LIB_VERSIONING_ENABLE)
+add_library(libplaidml INTERFACE)
+target_link_libraries(libplaidml INTERFACE ${PLAIDML_LIBRARIES})
+add_library(plaidml_backend SHARED ${SRC})
+if(NGRAPH_LIB_VERSIONING_ENABLE)
     set_target_properties(plaidml_backend PROPERTIES
         VERSION ${NGRAPH_VERSION}
         SOVERSION ${NGRAPH_API_VERSION})
-    endif()
-    target_include_directories(plaidml_backend SYSTEM PUBLIC ${PLAIDML_INCLUDE_DIRS})
-    target_link_libraries(plaidml_backend PUBLIC ngraph libplaidml)
-    set_target_properties(plaidml_backend PROPERTIES LIBRARY_OUTPUT_DIRECTORY "${NGRAPH_BUILD_DIR}")
-    install(TARGETS plaidml_backend LIBRARY DESTINATION ${NGRAPH_INSTALL_LIB})
-else()
-    message(STATUS "PlaidML not enabled")
 endif()
+target_include_directories(plaidml_backend SYSTEM PUBLIC ${PLAIDML_INCLUDE_DIRS})
+target_link_libraries(plaidml_backend PUBLIC ngraph libplaidml)
+set_target_properties(plaidml_backend PROPERTIES LIBRARY_OUTPUT_DIRECTORY "${NGRAPH_BUILD_DIR}")
+install(TARGETS plaidml_backend LIBRARY DESTINATION ${NGRAPH_INSTALL_LIB})