From be0376665a80d0d8f4777bed34c2a39d11fc38ab Mon Sep 17 00:00:00 2001
From: gregory guy <gregory-tde@laposte.net>
Date: Fri, 24 Apr 2020 12:18:37 +0200
Subject: Allow tqtinterface to build without OpenGL support. This should close
 bug 2645. Some cosmetics here and there. Adapted for r14.0.x branch.
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Signed-off-by: gregory guy <gregory-tde@laposte.net>
Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit db81506ab39530bfee455d14054040b4f43cd945)
---
 ConfigureChecks.cmake | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

(limited to 'ConfigureChecks.cmake')

diff --git a/ConfigureChecks.cmake b/ConfigureChecks.cmake
index 2f8204f..b603ac1 100644
--- a/ConfigureChecks.cmake
+++ b/ConfigureChecks.cmake
@@ -9,6 +9,16 @@
 #
 #################################################
 
+##### setup architecture flags ##################
+
+tde_setup_architecture_flags( )
+
+include(TestBigEndian)
+test_big_endian(WORDS_BIGENDIAN)
+
+tde_setup_largefiles( )
+
+
 macro( qt_message )
   message( STATUS "${ARGN}" )
 endmacro( )
@@ -75,8 +85,12 @@ qt_message( "  QT_INCLUDE_DIR: ${QT_INCLUDE_DIR}" )
 # detect native tqt
 if( EXISTS "${QT_INCLUDE_DIR}/ntqglobal.h" )
   set( HAVE_REAL_TQT ON CACHE BOOL "Native TQt3 detected" )
+  set( TQGLWIDGET_NAME "TQGLWidget" )
+  set( TQGL_INCLUDE "ntqgl.h" )
   qt_message( "Native TQt3 detected" )
 else( )
+  set( TQGLWIDGET_NAME "QGLWidget" )
+  set( TQGL_INCLUDE "qgl.h" )
   qt_message( "Qt3 detected" )
 endif( )
 
@@ -233,3 +247,44 @@ if( QT_VERSION STREQUAL "3" )
 endif( )
 
 tde_restore( CMAKE_REQUIRED_INCLUDES CMAKE_REQUIRED_LIBRARIES )
+
+
+##### check for OpenGL
+
+execute_process(
+	COMMAND ${PKG_CONFIG_EXECUTABLE} ${QT_LIBRARIES} --variable=qt_config
+	OUTPUT_VARIABLE TQT_CONF_VARS
+	OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+
+MESSAGE(STATUS "List of qt_config variables: ${TQT_CONF_VARS}")
+
+string( REGEX MATCH " opengl " OPENGL_ENABLED " ${TQT_CONF_VARS} " )
+
+if( OPENGL_ENABLED )
+
+check_include_file( "OpenGL/glu.h" HAVE_GLU_OPENGL )
+check_include_file( "GL/glu.h"     HAVE_GLU_GL     )
+
+tde_save( CMAKE_REQUIRED_INCLUDES CMAKE_REQUIRED_LIBRARIES )
+set( CMAKE_REQUIRED_INCLUDES ${QT_INCLUDE_DIR} )
+set( CMAKE_REQUIRED_LIBRARIES -L${QT_LIBRARY_DIR} ${QT_LIBRARIES} )
+
+check_cxx_source_compiles("
+#include <cstdlib>
+#include <${TQGL_INCLUDE}>
+int main( int, char** )
+{
+	(void) new ${TQGLWIDGET_NAME}( NULL, \"qgl\" ) ;
+	return EXIT_SUCCESS ;
+}"
+TQGLWIDGET )
+
+tde_restore( CMAKE_REQUIRED_INCLUDES CMAKE_REQUIRED_LIBRARIES )
+
+if( ( HAVE_GLU_OPENGL OR HAVE_GLU_GL ) AND TQGLWIDGET )
+    set( HAVE_OPENGL 1 )
+ else()
+    tde_message_fatal( "OpenGL has been requested, but neither the OpenGL headers or tqt3 with OpenGL support have been found on your system" )
+endif()
+endif( OPENGL_ENABLED )
-- 
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