[llvm]Add features. (#8771)

* [llvm]Add features.

* [llvm]Add ${FEATURE_OPTIONS}, set feature util to default feature.

ports/llvm/CONTROL

@@ -3,3 +3,16 @@ Version: 8.0.0-3
 Homepage: https://llvm.org/
 Description: The LLVM Compiler Infrastructure
 Build-Depends: atlmfc (windows)
+Default-Features: tools, utils
+
+Feature: tools
+Description: Generate build targets for the LLVM tools.
+
+Feature: utils
+Description: Generate build targets for the LLVM utils.
+
+Feature: example
+Description: Generate build targets for the LLVM examples
+
+Feature: test
+Description: Generate build targets for the LLVM unit tests.

ports/llvm/portfile.cmake

@@ -44,15 +44,18 @@ vcpkg_find_acquire_program(PYTHON3)
 get_filename_component(PYTHON3_DIR "${PYTHON3}" DIRECTORY)
 set(ENV{PATH} "$ENV{PATH};${PYTHON3_DIR}")
 
+vcpkg_check_features(OUT_FEATURE_OPTIONS FEATURE_OPTIONS
+    tools LLVM_INCLUDE_TOOLS
+    utils LLVM_INCLUDE_UTILS
+    example LLVM_INCLUDE_EXAMPLES
+    test LLVM_INCLUDE_TESTS
+)
+
 vcpkg_configure_cmake(
     SOURCE_PATH ${SOURCE_PATH}
     PREFER_NINJA
-    OPTIONS
+    OPTIONS ${FEATURE_OPTIONS}
         -DLLVM_TARGETS_TO_BUILD=X86
-        -DLLVM_INCLUDE_TOOLS=ON
-        -DLLVM_INCLUDE_UTILS=OFF
-        -DLLVM_INCLUDE_EXAMPLES=OFF
-        -DLLVM_INCLUDE_TESTS=OFF
         -DLLVM_ABI_BREAKING_CHECKS=FORCE_OFF
         -DLLVM_TOOLS_INSTALL_DIR=tools/llvm
         -DLLVM_PARALLEL_LINK_JOBS=1