CMake: Add wxUSE_NO_RTTI option

This is similar to configure --enable-no_rtti option.

Closes https://github.com/wxWidgets/wxWidgets/pull/1405

build/cmake/init.cmake

@@ -50,6 +50,15 @@ if(wxBUILD_COMPATIBILITY VERSION_LESS 3.1)
     set(WXWIN_COMPATIBILITY_3_0 ON)
 endif()
 
+if(wxUSE_NO_RTTI)
+    if(MSVC)
+        add_compile_options("/GR-")
+    elseif(("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU") OR ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang"))
+        add_compile_options("-fno-rtti")
+    endif()
+    add_definitions("-DwxNO_RTTI")
+endif()
+
 # Build wxBUILD_FILE_ID used for config and setup path
 #TODO: build different id for WIN32
 set(wxBUILD_FILE_ID "${wxBUILD_TOOLKIT}${wxBUILD_WIDGETSET}-")

build/cmake/options.cmake

@@ -44,6 +44,8 @@ if(WIN32)
     set(wxBUILD_VENDOR "custom" CACHE STRING "Short string identifying your company (used in DLL name)")
 endif()
 
+wx_option(wxUSE_NO_RTTI "disable RTTI support" OFF)
+
 # STL options
 wx_option(wxUSE_STL "use standard C++ classes for everything" OFF)
 set(wxTHIRD_PARTY_LIBRARIES ${wxTHIRD_PARTY_LIBRARIES} wxUSE_STL "use C++ STL classes")