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Why is it "-Fhardened" and not "-fhardened"?

That is Hacker News butchering the title. The flag is in fact -fhardened as stated in TFA.

Glad to hear that. I was a bit worried the GCC boffins had lost it or something.

Every instance in the source article uses lower case; not sure if they changed it or the title just got mangled when posting