preprocessor symbol to distinguish s390, s390x?

["Steve M. Robbins" <steve@sumost.ca>]

Hi,

I just uploaded a fixed version of gmp that builds on s390x.
However, I realized that both s390 and s390x use the
same include file, gmp-s390.h.  

In order to avoid this clash (see /usr/include/gmp.h), I need a C
preprocessor symbol that s390x defines but s390 does not.  Perhaps
__s390x__ ?

Thanks,
-Steve

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