How do I turn on RTTI with Cygwin?

问题

When my Android NDK C++ native code is compiled, the following error appears:

error: 'dynamic_cast' not permitted with -fno-rtti

Someone told me to turn on RTTI, but I didn't know how to do. Do I need to modify Application.mk or what?

my Application.mk:

# it is needed for ndk-r5

APP_STL := stlport_static

APP_ABI := armeabi armeabi-v7a

APP_MODULES := cocos2d cocosdenshion chipmunk box2d tempestkeep

When I add APP_CPPFLAGS += -frtti in some .o file appears another error:

undefined reference to `typeinfo for std::ios_base'

回答1:

Looks like you need to remove -fno-rtti gcc option in Application.mk. Look for it in APP_CPPFLAGS variable in Application.mk.

来源：https://stackoverflow.com/questions/7427748/how-do-i-turn-on-rtti-with-cygwin