From 20feedac95c519c71d4db93ab28ad1a110dfbcca Mon Sep 17 00:00:00 2001
From: Joerg Bornemann <joerg.bornemann@qt.io>
Date: Tue, 1 Jun 2021 12:51:36 +0200
Subject: [PATCH] Pass OpenGL_GL_PREFERENCE variable to other Qt repos

When building Linux packages, we pass OpenGL_GL_PREFERENCE=LEGACY when
building qtbase. This is done to link against legacy OpenGL libs.

When building non-qtbase repos, we also need to set this variable to the
same value we have in qtbase.

Pick-to: 6.1
Task-number: QTBUG-89754
Fixes: QTBUG-94040
Change-Id: I567b629d245025d2b1544b91cfc265a9c921725f
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
---
 cmake/QtPostProcessHelpers.cmake | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/cmake/QtPostProcessHelpers.cmake b/cmake/QtPostProcessHelpers.cmake
index 9307ea8a207..e17bf8840ed 100644
--- a/cmake/QtPostProcessHelpers.cmake
+++ b/cmake/QtPostProcessHelpers.cmake
@@ -637,6 +637,14 @@ endif()
 ")
         endif()
 
+        if(DEFINED OpenGL_GL_PREFERENCE)
+            string(APPEND QT_EXTRA_BUILD_INTERNALS_VARS
+                "
+# Use the OpenGL_GL_PREFERENCE value qtbase was built with. But do not FORCE it.
+set(OpenGL_GL_PREFERENCE \"${OpenGL_GL_PREFERENCE}\" CACHE STRING \"\")
+")
+        endif()
+
         qt_compute_relative_path_from_cmake_config_dir_to_prefix()
         configure_file(
             "${CMAKE_CURRENT_LIST_DIR}/QtBuildInternalsExtra.cmake.in"