Updated CMake Policies.

2026-05-16 21:36:45 +00:00
parent e25a28f3bf
commit 7c246bd12e
10 changed files with 798 additions and 9 deletions
@@ -0,0 +1,91 @@
+include(CMakeParseArguments)
+
+# Resolve a dependency in this order:
+# 1) already-defined target(s)
+# 2) find_package() system package(s)
+# 3) FetchContent fallback
+function(hdk_resolve_dependency)
+  set(_opts "")
+  set(_one_value NAME MIN_VERSION USE_SYSTEM FETCH_FALLBACK GIT_REPOSITORY GIT_TAG FETCHCONTENT_NAME OUT_VAR)
+  set(_multi_value TARGETS PACKAGE_NAMES)
+  cmake_parse_arguments(HDK_DEP "${_opts}" "${_one_value}" "${_multi_value}" ${ARGN})
+
+  if(NOT HDK_DEP_NAME)
+    message(FATAL_ERROR "hdk_resolve_dependency requires NAME")
+  endif()
+  if(NOT HDK_DEP_TARGETS)
+    message(FATAL_ERROR "hdk_resolve_dependency(${HDK_DEP_NAME}) requires TARGETS")
+  endif()
+  if(NOT HDK_DEP_FETCHCONTENT_NAME)
+    message(FATAL_ERROR "hdk_resolve_dependency(${HDK_DEP_NAME}) requires FETCHCONTENT_NAME")
+  endif()
+
+  set(_hdk_dep_resolved_target "")
+  foreach(_target IN LISTS HDK_DEP_TARGETS)
+    if(TARGET ${_target})
+      set(_hdk_dep_resolved_target ${_target})
+      break()
+    endif()
+  endforeach()
+
+  if(NOT _hdk_dep_resolved_target AND HDK_DEP_USE_SYSTEM)
+    foreach(_pkg IN LISTS HDK_DEP_PACKAGE_NAMES)
+      if(HDK_DEP_MIN_VERSION)
+        find_package(${_pkg} ${HDK_DEP_MIN_VERSION} QUIET CONFIG)
+      else()
+        find_package(${_pkg} QUIET CONFIG)
+      endif()
+
+      foreach(_target IN LISTS HDK_DEP_TARGETS)
+        if(TARGET ${_target})
+          set(_hdk_dep_resolved_target ${_target})
+          break()
+        endif()
+      endforeach()
+
+      if(_hdk_dep_resolved_target)
+        break()
+      endif()
+    endforeach()
+  endif()
+
+  if(NOT _hdk_dep_resolved_target)
+    if(NOT HDK_DEP_FETCH_FALLBACK)
+      if(HDK_DEP_MIN_VERSION)
+        message(FATAL_ERROR "${HDK_DEP_NAME} >= ${HDK_DEP_MIN_VERSION} not found and fallback is disabled")
+      else()
+        message(FATAL_ERROR "${HDK_DEP_NAME} not found and fallback is disabled")
+      endif()
+    endif()
+
+    if(NOT HDK_DEP_GIT_REPOSITORY)
+      message(FATAL_ERROR "hdk_resolve_dependency(${HDK_DEP_NAME}) fallback requires GIT_REPOSITORY")
+    endif()
+    if(NOT HDK_DEP_GIT_TAG)
+      message(FATAL_ERROR "hdk_resolve_dependency(${HDK_DEP_NAME}) fallback requires GIT_TAG")
+    endif()
+
+    include(FetchContent)
+    FetchContent_Declare(
+      ${HDK_DEP_FETCHCONTENT_NAME}
+      GIT_REPOSITORY ${HDK_DEP_GIT_REPOSITORY}
+      GIT_TAG ${HDK_DEP_GIT_TAG}
+    )
+    FetchContent_MakeAvailable(${HDK_DEP_FETCHCONTENT_NAME})
+
+    foreach(_target IN LISTS HDK_DEP_TARGETS)
+      if(TARGET ${_target})
+        set(_hdk_dep_resolved_target ${_target})
+        break()
+      endif()
+    endforeach()
+  endif()
+
+  if(NOT _hdk_dep_resolved_target)
+    message(FATAL_ERROR "${HDK_DEP_NAME} could not be resolved to any expected target: ${HDK_DEP_TARGETS}")
+  endif()
+
+  if(HDK_DEP_OUT_VAR)
+    set(${HDK_DEP_OUT_VAR} ${_hdk_dep_resolved_target} PARENT_SCOPE)
+  endif()
+endfunction()