[boost] [endian] ARM support

Subject: [boost] [endian] ARM support
From: Phil Endecott (spam_from_boost_dev_at_[hidden])
Date: 2009-12-16 15:08:33

Dear All,

Can ARM support be added to detail/endian.hpp ?

It's complicated by the fact that ARM systems may have either 
endianness.  I believe that the symbols __ARMEL__ and __ARMEB__ are 
defined by gcc for the little- and big-endian cases respectively.

However, it also seems that gcc defines __LITTLE_ENDIAN__; can we just 
test for that?  There is possibly some confusion with __LITTLE_ENDIAN 
and __BIG_ENDIAN (no trailing __s) which I believe glibc defines both 
of as 4321 and 1234, but it should be OK to write:

#elif defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__)
...

I suspect someone has looked at this before.  It can't do any harm to 
add all of the potential tests, can it?

Thanks,  Phil.