It's hard enough to find an error in your code when you're looking for it; it's even harder when you've assumed your code is error-free.
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Aww, I was disappointed by the power set example. You see, back in the mid 1990's, when we were implementing gcc multilib support (this is the idea that if the user gives gcc flags that lead to incompatible ABIs, you need to supply corresponding libgcc and possibly libc/libm that match...) at Cygnus (mostly for embedded work) I had to implement power set in sh (after all, the user could combine the incompatible options) - and not even full POSIX sh, but a subset that pre-autoconf configure scripts were allowed to use (so that they actually worked on things like LynxOS.)
I mostly remember it being unpleasant, and hoped I'd find something more modern and elegant here :-)
(Eventually Ian Taylor rewrote all that, and I don't know what the current gcc-multilib packaging does - avoiding the problem and specifying the desired combinations explicitly would not have been wrong...)
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