-qxlcompatmacros

Category

Portability and migration

Pragma equivalent

None

Purpose

The option -qxlcompatmacros controls definition of the following legacy macros: __xlC__, __xlC_ver__, __IBMCPP__, __IBMC__, and __xlc__.

For releases starting from IBM® XL C/C++ for Linux, V16.1, the default is -qnoxlcompatmacros. However, compared with earlier versions, this may have impacts on configuring make files with IBM XL C/C++ for Linux for little endian distributions, as both __clang__ and __gcc__ macros are also defined.

You may need to use the -qxlcompatmacros option under these circumstances:

Alternatively, you can change instances of the legacy maros to __ibmxl__, which is always defined in all versions of XL C/C++ for Linux for little endian distributions.

        .-noxlcompatmacros-.   
>>- -q--+-xlcompatmacros---+-----------------------------------><

Defaults

-qnoxlcompatmacros

Predefined macros

The following macros are defined when the -qxlcompatmacros option is in effect; otherwise, they are undefined.

• __IBMCPP__
• __IBMC__
• __xlc__
• __xlC__
• __xlC_ver__