Each of the gxlc and gxlc++ utilities accepts GNU C or C++ compiler options and translates them into comparable XL C/C++ options. Both utilities use the XL C/C++ options to create an xlc or xlc++ invocation command, which they use to invoke the compiler. These utilities are provided to facilitate the reuse of make files created for applications previously developed with GNU C/C++. However, to fully exploit the capabilities of XL C/C++, it is recommended that you use the XL C/C++ invocation commands and their associated options.
The actions of gxlc and gxlc++ are controlled by the configuration file /etc/gxlc.cfg. The GNU C/C++ options that have an XL C or XL C++ counterpart are shown in this file. Not every GNU option has a corresponding XL C/C++ option. gxlc and gxlc++ return warnings for input options that were not translated.
The gxlc and gxlc++ option mappings are modifiable. For information on adding to or editing the gxlc and gxlc++ configuration file, see Configuring the gxlc or gxlc++ option mapping.