What does 'inline' mean?

[Stefan Koch]

On Monday, 8 June 2020 at 08:45:02 UTC, Basile B. wrote:

> what if the function address is took in a delegate ?
> It still needs to be there, in the object matching to the CU 
> where it is declared, otherwise there will be surprises, e.g 
> &func in a CU and &func in another will have different 
> addresses.

I have _never_ compared addresses of inline functions from 
different CUs.
How would I even do that?
by storing the function pointer in a global which is visible from 
multiple translation units?
Is that a valid concern?
Will _any_ project out there break because of that?