Migrating from Linux for big endian distributions to Linux for little endian distributions
You must consider some factors when migrating your applications from POWER8® big endian systems.
- To help migrate programs from big endian systems, you can use the -qaltivec=be or -qaltivec=le option to toggle the vector element sequence in registers to big endian or little endian element order.
- In IBM® XL
C/C++ for Linux V13.1.2,
legacy macros
__IBMCPP__, __xlC__, __xlC_ver__
, 
__IBMC__,
and __xlc__
are predefined by the
compiler with the -qxlcompatmacros option. This
option helps you migrate programs from IBM XL
C/C++ for Linux V13.1
or earlier for big endian distributions to IBM XL
C/C++ for Linux V13.1.2
for little endian distributions.
