Update tde_setup_gcc_visibility macro

+ In the test include kdemacros.h with detected full path to avoid FTBFS.
+ Do not test gcc visibility on TDE unless the current module uses TDE.
+ Do not test gcc visibility on TQt unless the current module uses TQt.
+ Improve test for gcc visibility on TQt to make it more accurate.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit f8254e1561)

modules/TDEMacros.cmake

@@ -1869,6 +1869,7 @@ macro( tde_setup_gcc_visibility )
       tde_message_fatal( "gcc visibility support was requested, but your system is not *NIX" )
     endif( NOT UNIX )
 
+    if( TQT_FOUND )
       find_library( TQT_LIBFILE tqt-mt HINTS "${TQT_LIBRARY_DIRS}" )
       if( NOT "${TQT_LIBFILE}" STREQUAL "TQT_LIBFILE-NOTFOUND" )
         message( STATUS "Performing Test HAVE_TQT_VISIBILITY" )
@@ -1877,18 +1878,20 @@ macro( tde_setup_gcc_visibility )
           OUTPUT_VARIABLE HAVE_TQT_VISIBILITY
         )
         if( "${HAVE_TQT_VISIBILITY}" STREQUAL "" OR
-          "${HAVE_TQT_VISIBILITY}" MATCHES "DEFAULT[^\n]*QSettingsPrivate" )
+            "${HAVE_TQT_VISIBILITY}" MATCHES "GLOBAL[\t ]+DEFAULT[^\n]+QSettingsPrivate" )
           message( STATUS "Performing Test HAVE_TQT_VISIBILITY - Failed" )
           tde_message_fatal( "gcc visibility support was requested, but not supported in tqt library" )
         endif( )
         message( STATUS "Performing Test HAVE_TQT_VISIBILITY - Success" )
       endif( )
+    endif( TQT_FOUND )
 
+    if( TDE_FOUND )
       find_file( TDEMACROS_H kdemacros.h HINTS "${TDE_INCLUDE_DIR}" )
       if( NOT "${TDEMACROS_H}" STREQUAL "TDEMACROS_H-NOTFOUND" )
         tde_save_and_set( CMAKE_REQUIRED_INCLUDES "${TDE_INCLUDE_DIR}" )
         check_cxx_source_compiles( "
-        #include <kdemacros.h>
+          #include <${TDEMACROS_H}>
             #ifndef __KDE_HAVE_GCC_VISIBILITY
             #error gcc visibility is not enabled in tdelibs
             #endif
@@ -1900,6 +1903,7 @@ macro( tde_setup_gcc_visibility )
           tde_message_fatal( "gcc visibility support was requested, but not supported in tdelibs" )
         endif( NOT HAVE_TDE_VISIBILITY )
       endif( )
+    endif( TDE_FOUND )
 
     set( __KDE_HAVE_GCC_VISIBILITY 1 )
     set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fvisibility=hidden -fvisibility-inlines-hidden")