Replace halide patch with cmake options. (#2419)

cmake/external_halide.cmake

@@ -45,7 +45,6 @@ ExternalProject_Add(
     GIT_REPOSITORY ${HALIDE_GIT_REPO_URL}
     GIT_TAG ${HALIDE_GIT_TAG}
     UPDATE_COMMAND ""
-    PATCH_COMMAND patch -p1 --forward --reject-file=- -i ${CMAKE_SOURCE_DIR}/cmake/halide.patch || exit 0
     CMAKE_GENERATOR ${CMAKE_GENERATOR}
     CMAKE_GENERATOR_PLATFORM ${CMAKE_GENERATOR_PLATFORM}
     CMAKE_GENERATOR_TOOLSET ${CMAKE_GENERATOR_TOOLSET}
@@ -58,6 +57,18 @@ ExternalProject_Add(
     -DWITH_TUTORIALS=OFF
     -DWITH_TESTS=OFF
     -DCMAKE_POSITION_INDEPENDENT_CODE=ON
+    -DTARGET_ARM=OFF
+    -DTARGET_AARCH64=OFF
+    -DTARGET_HEXAGON=OFF
+    -DTARGET_METAL=OFF
+    -DTARGET_MIPS=OFF
+    -DTARGET_POWERPC=OFF
+    -DTARGET_PTX=OFF
+    -DTARGET_AMDGPU=OFF
+    -DTARGET_OPENCL=OFF
+    -DTARGET_OPENGL=OFF
+    -DTARGET_OPENGLCOMPUTE=OFF
+    -DTARGET_D3D12COMPUTE=OFF
     EXCLUDE_FROM_ALL TRUE
     )
 

cmake/halide.patch

-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index d70fdc79d..60aa4c3b7 100644
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -131,7 +131,8 @@ function(check_llvm_target TARGET HAS_TARGET)
-     set(_llvm_required_version ${ARGV2})
-   endif()
-   if (NOT LLVM_VERSION LESS _llvm_required_version)
--    list(FIND LLVM_TARGETS_TO_BUILD ${TARGET} _found_target)
-+    set(NGRAPH_TARGETS_TO_BUILD "X86")
-+    list(FIND NGRAPH_TARGETS_TO_BUILD ${TARGET} _found_target)
-     if (_found_target GREATER -1)
-       set(${HAS_TARGET} ON PARENT_SCOPE)
-     else()