Of course the compiler should be internally consistent. A record written on i.e. Windows should be readable on i.e. Linux. Only if {$packrecords C}
is used, we pack records according to ABI, as to interface with the OS.

Are any bitpacked structures used in the API of any OS ?

If hardware access is an issue: how should endianess be handled ? The compiler does know about the endianess of the processor, but it does not know about what endianess the user needs in the hardware. Thus it would be necessary to define it via a kind of compiler option.

-Michael
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