https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81842
--- Comment #14 from igor.v.tsimbalist at intel dot com --- The new option is needed to support two cases: 1. Compilation of ucontext functions inside glibc. To have glibc itself be CET compatible all files comprises the library has to be CET compatible. That meansthe module with ucontext functions from glibc has to be forced to be CET compatible. 2. Compilation of a user application with ucontext functions. In this case the error has to be issued, so no usage of a ucontext functions. Having just __SHSTK__ macro it's impossible to handle both cases. The case #1 will report an error during glibc compilation. A new macro is introduced to use in a source file to handle these cases. To control the value of the new macro a new option is introduced. Glibc sources will be compiled with -no-mcheck-shstk-compat.
