Ensure the use of C++17 standard for Poppler >= 21.12.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

config.h.cmake

@@ -1,6 +1,7 @@
 #cmakedefine VERSION "@VERSION@"
 
 // poppler-tqt
+#cmakedefine HAVE_POPPLER_2112
 #cmakedefine HAVE_POPPLER_2111
 #cmakedefine HAVE_POPPLER_2108
 #cmakedefine HAVE_POPPLER_086

tdefile-plugins/dependencies/poppler-tqt/CMakeLists.txt

@@ -41,6 +41,7 @@ install( FILES
     poppler-qt.h poppler-page-transition.h poppler-link-qt3.h
   DESTINATION ${INCLUDE_INSTALL_DIR} )
 
+
 ##### poppler-tqt (shared) ############################
 
 tde_add_library( poppler-tqt SHARED AUTOMOC
@@ -50,6 +51,12 @@ tde_add_library( poppler-tqt SHARED AUTOMOC
     poppler-page-transition.cpp poppler-page-transition-private.h
     poppler-private.cpp poppler-private.h
   VERSION 0.0.0
+  CXX_FEATURES ${POPPLER_CXX_FEATURES}
   LINK ${POPPLER_LIBRARIES} ${TQT_LIBRARIES}
   DESTINATION ${LIB_INSTALL_DIR}
 )
+
+
+##### install cmake export file #################
+
+tde_install_export( )

tdefile-plugins/dependencies/poppler-tqt/ConfigureChecks.cmake

@@ -24,7 +24,7 @@ check_cxx_source_compiles("
   HAVE_POPPLER_030 )
 tde_restore( CMAKE_REQUIRED_INCLUDES CMAKE_REQUIRED_LIBRARIES )
 
-foreach( _poppler_ver 0.58 0.64 0.70 0.71 0.72 0.76 0.82 0.83 0.86 21.08 21.11 )
+foreach( _poppler_ver 0.58 0.64 0.70 0.71 0.72 0.76 0.82 0.83 0.86 21.08 21.11 21.12 )
   string( REPLACE "." "" _poppler_str "${_poppler_ver}" )
   if( NOT DEFINED HAVE_POPPLER_${_poppler_str} )
     message( STATUS "Performing Test HAVE_POPPLER_${_poppler_str}" )
@@ -37,3 +37,7 @@ foreach( _poppler_ver 0.58 0.64 0.70 0.71 0.72 0.76 0.82 0.83 0.86 21.08 21.11 )
     endif( )
   endif( )
 endforeach( )
+
+if( HAVE_POPPLER_2112 )
+  set( POPPLER_CXX_FEATURES cxx_std_17 CACHE INTERNAL "C++ standard required by Poppler" )
+endif()