[Bug libc/20422] do not allow asan/msan/tsan and fortify at the same time.

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20422

--- Comment #5 from Florian Weimer <fweimer at redhat dot com> ---
These days, _FORTIFY_SOURCE covers additional aspects (including enhanced
compile-time type safety), not just buffer-length checking.  I'm not sure what
the current expectations regarding the sanitizers are.  Is it the norm to
compile twice, for production (with -D_FORTIFY_SOURCE=2), and for special
testing with the required sanitizer?

I'm asking this because if there is just a single compile (say with Address
Sanitizer), then I think we need to make the enhanced type safety (and other
goodies) available to sanitizer users as well.

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