Mike Frysinger <vapier@gentoo.org> writes:

> Since newlib isn't prepared to build itself with _FORTIFY_SOURCE, and
> it's not clear if it's even useful, disable it when building the code.

It is useful; I've caught a few library bugs when I turned this on for
picolibc. Fixing newlib to handle -D_FORTIFY_SOURCE could probably start
with the patches I did in picolibc, which mostly just #undef the various
mem and str functions before defining them.

General code:

https://github.com/picolibc/picolibc/commit/c2c593afa60b64bff0a958ad930e0336463db5bf

Arm specific code:

https://github.com/picolibc/picolibc/commit/b3946840fb3a677125bc9232ca93ea7533375188


-- 
-keith