From c963597525b240e96461501ae47c54c6d0d6884b Mon Sep 17 00:00:00 2001
From: "L. E. Segovia" <amy@centricular.com>
Date: Wed, 12 Feb 2025 17:10:30 +0000
Subject: [PATCH] cmake: Memoize include checks

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8478>
---
 subprojects/gstreamer/cmake/FindGStreamer.cmake | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/subprojects/gstreamer/cmake/FindGStreamer.cmake b/subprojects/gstreamer/cmake/FindGStreamer.cmake
index 3b25e3207e..8d858bed82 100644
--- a/subprojects/gstreamer/cmake/FindGStreamer.cmake
+++ b/subprojects/gstreamer/cmake/FindGStreamer.cmake
@@ -178,10 +178,17 @@ endmacro()
 macro(_gst_filter_missing_directories GST_INCLUDE_DIRS)
     set(_gst_include_dirs)
     foreach(DIR IN LISTS ${GST_INCLUDE_DIRS})
-        if ((IS_DIRECTORY "${DIR}") AND (EXISTS "${DIR}"))
+        string(MAKE_C_IDENTIFIER "${DIR}" _gst_dir_id)
+        if (DEFINED _gst_exists_${_gst_dir_id})
+            if (_gst_exists_${_gst_dir_id})
+                list(APPEND _gst_include_dirs "${DIR}")
+            endif()
+        elseif (EXISTS "${DIR}")
             list(APPEND _gst_include_dirs "${DIR}")
+            set(_gst_exists_${_gst_dir_id} TRUE)
         else()
             message(WARNING "Skipping missing include folder ${DIR}.")
+            set(_gst_exists_${_gst_dir_id} FALSE)
         endif()
     endforeach()
     set(${GST_INCLUDE_DIRS} "${_gst_include_dirs}")