1 files changed, 44 insertions, 0 deletions
diff --git a/cmake/AutoOption.cmake b/cmake/AutoOption.cmake
new file mode 100644
index 000000000..3f7cdee0e
--- /dev/null
+++ b/cmake/AutoOption.cmake
@@ -0,0 +1,44 @@
+function(auto_option name package description)
+    set(${name} "AUTO" CACHE STRING ${description})
+    set_property(CACHE ${name} PROPERTY STRINGS AUTO ON OFF)
+
+    if(${${name}} OR ${${name}} STREQUAL "AUTO")
+        if(${${name}} STREQUAL "AUTO")
+            set(req)
+        else()
+            set(req REQUIRED)
+        endif()
+        find_package(${package} ${req})
+
+        if(${${package}_FOUND})
+            set(${name} TRUE CACHE STRING ${description} FORCE)
+        else()
+            set(${name} FALSE CACHE STRING ${description} FORCE)
+        endif()
+    endif()
+endfunction()
+
+function(enum_option name init description)
+    set(enums)
+    set(is_enum TRUE)
+    foreach(enum_or_desc ${ARGN})
+        if(is_enum)
+            list(APPEND enums ${enum_or_desc})
+            string(APPEND description "\n" "${enum_or_desc}" ": ")
+            set(is_enum FALSE)
+        else()
+            string(APPEND description "${enum_or_desc}")
+            set(is_enum TRUE)
+        endif()
+    endforeach()
+
+    set(${name} ${init} CACHE STRING ${description})
+    set_property(CACHE ${name} PROPERTY STRINGS ${enums})
+
+    foreach(enum ${enums})
+        if(${${name}} STREQUAL ${enum})
+            return()
+        endif()
+    endforeach()
+    message(FATAL_ERROR "${name} must be one of ${enums}")
+endfunction()