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http://bugs.exim.org/show_bug.cgi?id=1049
--- Comment #24 from Zoltan Herczeg <hzmester@???> 2011-11-15 11:34:03 ---
(In reply to comment #20)
> (In reply to comment #15)
> > > By the way, does anyone know a clever way of compile time endianness check?
> >
> > Don't you just set up an int and then cast a pointer to it as char * and
> > then look at the bytes?
> >
> I've found that using pointer casting can cause some ugly compiler warnings
> (mind you, I was dealing with doubles at the time). A cleaner way is using a
> union:
>
> static const union { int i; char c; } order = { 1 }; /* initialisation assigns
> first union member */
>
> You can then simply check:
>
> if (order.c == 1) {
> /* little endian */
> } else {
> /* big endian */
> }
>
> Both gcc and llvm/clang recognize this correctly and optimize out the unused
> case.
Thank you for the idea. I am not sure what other compilers do, so we probably
need to introduce a macro, which is doing the stuff above by default. Still it
allows different implementation if needed.
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