On Feb 4, 2024, at 11:48, David McClain <dbm@refined-audiometrics.com> wrote:

#x100 will generally do it for me, for the past 50 years. Reads back as a 2-byte stream as 00 01 on little-endian, and 01 00 on big-endian.

But yes, ARM is like Intel, little endian.

- DM

On Feb 4, 2024, at 10:03, Marco Antoniotti <marco.antoniotti@unimib.it> wrote:

Hello everybody,

I am in a rabbit hole (don't ask!), and I need to drag some other people with me.

What is the consensus about the most portable way to detect the endianness of a machine/platform?  (Ok, we can assume that while running on an ARM the endianness is "fixed" by the OS)

All the best

MA

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