[ensmallen] Fix usage (#38515)

Co-authored-by: Billy Robert O'Neal III <bion@microsoft.com>

ports/ensmallen/dependencies.patch

@@ -1,19 +1,36 @@
 diff --git a/CMake/ensmallen-config.cmake.in b/CMake/ensmallen-config.cmake.in
-index 3a9a93c..a067e08 100644
+index 3a9a93c..7bed7fd 100644
 --- a/CMake/ensmallen-config.cmake.in
 +++ b/CMake/ensmallen-config.cmake.in
-@@ -1,4 +1,6 @@
+@@ -1,4 +1,9 @@
  @PACKAGE_INIT@
 +include(CMakeFindDependencyMacro)
++if(@USE_OPENMP@)
++find_dependency(OpenMP)
++endif()
 +find_dependency(Armadillo CONFIG)
  
  include(${CMAKE_CURRENT_LIST_DIR}/@TARGETS_EXPORT_NAME@.cmake)
  check_required_components(ensmallen)
 diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 205fe1b..7fcd207 100644
+index 551c538..0b20af1 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
-@@ -57,8 +57,8 @@ if(USE_OPENMP)
+@@ -47,21 +47,13 @@ endif()
+ 
+ # Find OpenMP and link it.
+ if(USE_OPENMP)
+-  if(NOT TARGET OpenMP::OpenMP_CXX)
+-    find_package(Threads REQUIRED)
+-    add_library(OpenMP::OpenMP_CXX IMPORTED INTERFACE)
+-    set_property(TARGET OpenMP::OpenMP_CXX
+-        PROPERTY INTERFACE_COMPILE_OPTIONS ${OpenMP_CXX_FLAGS})
+-    # Only works if the same flag is passed to the linker; use CMake 3.9+ otherwise (Intel, AppleClang).
+-    set_property(TARGET OpenMP::OpenMP_CXX
+-        PROPERTY INTERFACE_LINK_LIBRARIES ${OpenMP_CXX_FLAGS} Threads::Threads)
+-  endif()
++  find_package(OpenMP REQUIRED)
+   target_link_libraries(ensmallen INTERFACE OpenMP::OpenMP_CXX)
  endif()
  
  # Find Armadillo and link it.

ports/ensmallen/portfile.cmake

@@ -1,24 +1,27 @@
-vcpkg_minimum_required(VERSION 2022-10-12) # for ${VERSION}
+set(VCPKG_BUILD_TYPE release) # header-only
+
 vcpkg_from_github(
     OUT_SOURCE_PATH SOURCE_PATH
     REPO mlpack/ensmallen
     REF "${VERSION}"
-    SHA512 1e86fc28a58694057262a8d036af8080be084c889f7b659b77a08fd4e0957d0f03d8866e47b682a1868b5ac2198cca85c591a334b284096659a123196de95a66
+    SHA512 1e86fc28a58694057262a8d036af8080be084c889f7b659b77a08fd4e0957d0f03d8866e47b682a1868b5ac2198cca85c591a334b284096659a123196de95a66
     HEAD_REF master
     PATCHES
         dependencies.patch
 )
 
+vcpkg_check_features(OUT_FEATURE_OPTIONS FEATURE_OPTIONS
+    FEATURES
+        openmp     USE_OPENMP
+)
+
 vcpkg_cmake_configure(
     SOURCE_PATH "${SOURCE_PATH}"
-    OPTIONS
-        -DBUILD_TESTS=OFF
+    OPTIONS ${FEATURE_OPTIONS}
 )
 vcpkg_cmake_install()
-
 vcpkg_cmake_config_fixup(CONFIG_PATH lib/cmake/ensmallen)
 
-file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/debug")
 file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/lib")
 
-file(INSTALL "${SOURCE_PATH}/COPYRIGHT.txt" DESTINATION "${CURRENT_PACKAGES_DIR}/share/${PORT}" RENAME copyright)
+vcpkg_install_copyright(FILE_LIST "${SOURCE_PATH}/COPYRIGHT.txt")

ports/ensmallen/vcpkg.json

@@ -1,13 +1,12 @@
 {
   "name": "ensmallen",
   "version-semver": "2.21.1",
+  "port-version": 1,
   "description": "A header-only C++ library for mathematical optimization",
   "homepage": "http://ensmallen.org/",
   "license": "BSD-3-Clause",
   "dependencies": [
     "armadillo",
-    "blas",
-    "lapack",
     {
       "name": "vcpkg-cmake",
       "host": true
@@ -16,5 +15,16 @@
       "name": "vcpkg-cmake-config",
       "host": true
     }
-  ]
+  ],
+  "default-features": [
+    {
+      "name": "openmp",
+      "platform": "!osx"
+    }
+  ],
+  "features": {
+    "openmp": {
+      "description": "Enable OpenMP support"
+    }
+  }
 }

scripts/ci.feature.baseline.txt

@@ -107,6 +107,7 @@ discord-rpc:x64-uwp=fail
 dmlc(uwp) = fail
 eastl:arm-uwp=fail
 ebml:arm-uwp=fail
+ensmallen[openmp](osx) = feature-fails # No openmp on default osx toolchain
 epsilon(uwp)=fail
 faiss:arm64-windows=fail
 fastrtps:arm-uwp=fail

versions/baseline.json

@@ -2690,7 +2690,7 @@
     },
     "ensmallen": {
       "baseline": "2.21.1",
-      "port-version": 0
+      "port-version": 1
     },
     "entityx": {
       "baseline": "1.3.0",

versions/e-/ensmallen.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "48e2f67f2f3818bd40c39e15744009e8a035c63b",
+      "version-semver": "2.21.1",
+      "port-version": 1
+    },
     {
       "git-tree": "b3a65c226ad563c46413db6e1cde9d39f4684bf9",
       "version-semver": "2.21.1",