RTEMS | Draft: libmisc/stackchk: Add stack smashing protection (!277)

[Joel Sherrill (@joel)]

Joel Sherrill commented on a discussion on cpukit/libmisc/stackchk/check.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/277#note_115846

 >    RTEMS_SYSINIT_ISR_STACK,
 >    RTEMS_SYSINIT_ORDER_MIDDLE
 >  );
 > +
 > +/*
 > + * This is the default implementation. The user can override it 
 > + * at the application 
 > + */
 > +__attribute__((weak,noreturn)) void __stack_chk_fail(void)

It can be enabled just for that test. The unused symbols/functions will be left out of an exe if not referenced. I think only using the -fstack-protector-* option in the tests that exercise it is oK. No conditionals around anything in libmisc/stackcheck for stack-protector.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/277#note_115846
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