macros to detect endiannes?

[Kimmo Fredriksson <kfredrik@xxxxxxxxxxxxx>]

Hi,

I have some source that makes assumptions on the endiannes of the
architecture. To make it more portable I'd like write specific code for
both little and big endian machines. Are there any predefined macros that
could be used to detect the endiannes at compile time, that I could use in
conditional compilation?

Thanks,

kf