CPP macro for Byte-order

[Gabriel Dos Reis]

Hi,

  I'm currently working on the numeric_limits<> support for floating
point types (mainly for things like NaNs, SNaNs, Infinities,
subnormals and such) in the C++ runtime system.  I would like to know
whether there is a CPP macro that defines the endianness selected for
compiling a given program under a given OS.  Any hints?

-- Gaby
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