HEADS-UP: PIE enabled by default on main

[Greg 'groggy' Lehey]

On Thursday, 25 February 2021 at 15:58:07 -0500, Ed Maste wrote:
> As of 9a227a2fd642 (main-n245052) base system binaries are now built
> as position-independent executable (PIE) by default, for 64-bit
> architectures. PIE executables are used in conjunction with address
> randomization as a mitigation for certain types of security
> vulnerabilities.
>
> If you track -CURRENT and normally build WITHOUT_CLEAN you'll need to
> do one initial clean build -- either run `make cleanworld` or set
> WITH_CLEAN=yes.

This details worries me.  How compatible are PIE executables with
non-PIE executables?  Can I run PIE executables on older systems?  Can
I run older executables on a PIE system?

Greg
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