Bytes order and words order

[Gabriel Dos Reis]

Hi,

  Supports for floating-point data types in the C++ runtime system
require me to know the bytes and words orders used by the target.  I
would like to have means for the front-end or driver to pass those
information down to the library.  I think a minimal path would be for
CPP to define some macros like

    -D__TARGET_BYTES_ORDER__=__BIG_ENDIAN__ (or __LITTLE_ENDIAN__)
    -D__TARGET_WORDS_ORDER__=__BIG_ENDIAN__ (or __LITTLE_ENDIAN__)

with, for example, __LITTLE_ENDIAN__ and __BIG_ENDIAN__ predefined to 0
and 1 respectivelly.  The same set of macros would be needed for the
host in case of cross-compiling.

I'll also need symbols for the floating-point model used.

Thoughts? Neil?

-- Gaby