fun fact about ICU +universal

[Fred Wright]

On Sun, 14 Feb 2021, Ken Cunningham wrote:

> The i386/x86_64 universal build looks fine too, so far, with all the
> muniveral stuff out.
>
> Now -- have to see why it was ever put in there in the first place, I guess.

One of the typical sources of trouble with "natural universal" builds is 
architecture-dependent configure checks, whose results are inherently 
forced to be single-valued across architectures.  Since arm64 and x86_64 
have both the same bitness and the same endianness, it might be a 
non-issue for that combination in many cases, even while being technically 
incorrect.  If i386/x86_64 also works, that suggests that bitness isn't an 
issue, but endianness would be if ppc were included.  Alignment is another 
potential issue, but less likely to be in these cases.

Though another problem with this sort of issue is that merely building 
successfully doesn't verify that the code actually works correctly. 
Remember Apple was shipping Intel Macs to end users before they'd fixed 
all the endian bugs.

Fred Wright