1 files changed, 75 insertions, 0 deletions
diff --git a/CMake/DolphinLibraryTools.cmake b/CMake/DolphinLibraryTools.cmake
index f1681306cb..37f439de54 100644
--- a/CMake/DolphinLibraryTools.cmake
+++ b/CMake/DolphinLibraryTools.cmake
@@ -18,3 +18,78 @@ function(dolphin_make_imported_target_if_missing target lib)
     add_library(${target} ALIAS _${lib})
   endif()
 endfunction()
+
+function(dolphin_optional_system_library library)
+  string(TOUPPER ${library} upperlib)
+  set(USE_SYSTEM_${upperlib} "" CACHE STRING "Use system ${library} instead of bundled.  ON - Always use system and fail if unavailable, OFF - Always use bundled, AUTO - Use system if available, otherwise use bundled, blank - Delegate to USE_SYSTEM_LIBS.  Default is blank.")
+  if("${USE_SYSTEM_${upperlib}}" STREQUAL "")
+    if(APPROVED_VENDORED_DEPENDENCIES)
+      string(TOLOWER ${library} lowerlib)
+      if(lowerlib IN_LIST APPROVED_VENDORED_DEPENDENCIES)
+        set(RESOLVED_USE_SYSTEM_${upperlib} AUTO PARENT_SCOPE)
+      else()
+        set(RESOLVED_USE_SYSTEM_${upperlib} ON PARENT_SCOPE)
+      endif()
+    else()
+      set(RESOLVED_USE_SYSTEM_${upperlib} ${USE_SYSTEM_LIBS} PARENT_SCOPE)
+    endif()
+  else()
+    set(RESOLVED_USE_SYSTEM_${upperlib} ${USE_SYSTEM_${upperlib}} PARENT_SCOPE)
+  endif()
+endfunction()
+
+function(dolphin_add_bundled_library library bundled_path)
+  string(TOUPPER ${library} upperlib)
+  if (${RESOLVED_USE_SYSTEM_${upperlib}} STREQUAL "AUTO")
+    message(STATUS "No system ${library} was found.  Using static ${library} from Externals.")
+  else()
+    message(STATUS "Using static ${library} from Externals")
+  endif()
+  if (NOT EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/${bundled_path}/CMakeLists.txt")
+    message(FATAL_ERROR "No bundled ${library} was found.  Did you forget to checkout submodules?")
+  endif()
+  add_subdirectory(${bundled_path} EXCLUDE_FROM_ALL)
+endfunction()
+
+function(dolphin_find_optional_system_library library bundled_path)
+  dolphin_optional_system_library(${library})
+  string(TOUPPER ${library} upperlib)
+  if(RESOLVED_USE_SYSTEM_${upperlib})
+    find_package(${library} ${ARGN})
+    # Yay for cmake packages being inconsistent
+    if(DEFINED ${library}_FOUND)
+      set(prefix ${library})
+    else()
+      set(prefix ${upperlib})
+    endif()
+    if((NOT ${found}) AND (NOT ${RESOLVED_USE_SYSTEM_${upperlib}} STREQUAL "AUTO"))
+      message(FATAL_ERROR "No system ${library} was found.  Please install it or set USE_SYSTEM_${upperlib} to AUTO or OFF.")
+    endif()
+  endif()
+  if(${prefix}_FOUND)
+    message(STATUS "Using system ${library}")
+    set(${prefix}_TYPE "System" PARENT_SCOPE)
+  else()
+    dolphin_add_bundled_library(${library} ${bundled_path})
+    set(${prefix}_TYPE "Bundled" PARENT_SCOPE)
+  endif()
+endfunction()
+
+function(dolphin_find_optional_system_library_pkgconfig library search alias bundled_path)
+  dolphin_optional_system_library(${library})
+  string(TOUPPER ${library} upperlib)
+  if(RESOLVED_USE_SYSTEM_${upperlib})
+    pkg_check_modules(${library} ${search} ${ARGN} IMPORTED_TARGET)
+    if((NOT ${library}_FOUND) AND (NOT ${RESOLVED_USE_SYSTEM_${upperlib}} STREQUAL "AUTO"))
+      message(FATAL_ERROR "No system ${library} was found.  Please install it or set USE_SYSTEM_${upperlib} to AUTO or OFF.")
+    endif()
+  endif()
+  if(${library}_FOUND)
+    message(STATUS "Using system ${library}")
+    dolphin_alias_library(${alias} PkgConfig::${library})
+    set(${library}_TYPE "System" PARENT_SCOPE)
+  else()
+    dolphin_add_bundled_library(${library} ${bundled_path})
+    set(${library}_TYPE "Bundled" PARENT_SCOPE)
+  endif()
+endfunction()