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http://bugs.exim.org/show_bug.cgi?id=1049
Gertjan Halkes <eximbugz@???> changed:
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--- Comment #20 from Gertjan Halkes <eximbugz@???> 2011-11-15 09:34:38 ---
(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.
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