How to tell if a translation unit is being compiled with segmented stacks

Question

Is there a preprocessor macro, constant or something similar in C++ that can be used to tell if a translation unit is being compiled with segmented stacks (i.e. with -fsplit-stack)?

Answers for any compiler would be good but I am looking for clang and gcc in particular

Answer 1

According to this gcc wiki page, the preprocessor gets TARGET_SUPPORTS_SPLIT_STACK and the runtime gets bool supports_split_stack().