Add the ability to specify the necessary CXX features in tde_add_check_executable.

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

modules/TDEMacros.cmake

@@ -1487,6 +1487,7 @@ macro( tde_add_check_executable _arg_target )
   unset( _test_args )
   unset( _meta_includes )
   unset( _sources )
+  unset( _cxx_features )
   unset( _destination )
   unset( _link )
   unset( _dependencies )
@@ -1523,6 +1524,12 @@ macro( tde_add_check_executable _arg_target )
       set( _storage "_sources" )
     endif( "+${_arg}" STREQUAL "+SOURCES" )
 
+    # found directive "CXX_FEATURES"
+    if( "+${_arg}" STREQUAL "+CXX_FEATURES" )
+      set( _skip_store 1 )
+      set( _storage "_cxx_features" )
+    endif( "+${_arg}" STREQUAL "+CXX_FEATURES" )
+
     # found directive "LINK"
     if( "+${_arg}" STREQUAL "+LINK" )
       set( _skip_store 1 )
@@ -1564,6 +1571,12 @@ macro( tde_add_check_executable _arg_target )
   # add target
   add_executable( ${_target} EXCLUDE_FROM_ALL ${_sources} )
 
+  # set cxx features
+  if( TDE_CXX_FEATURES OR PROJECT_CXX_FEATURES OR _cxx_features )
+    target_compile_features( ${_target} PRIVATE
+      ${TDE_CXX_FEATURES} ${PROJECT_CXX_FEATURES} ${_cxx_features} )
+  endif( )
+
   # set link libraries
   if( _link )
     target_link_libraries( ${_target} ${_link} )