Potential increase in memory requirements

Memory requirements for compilation may increase for successive releases as new logic is added. If you cannot recompile an application that you successfully compiled with a previous release of the compiler, try increasing the region size. For the current default region size, refer to the z/OS XL C/C++ User's Guide.

As of z/OS® V1R12 XL C/C++, when using the IPA compiler option to compile very large applications, you might need to increase the size of the work file associated with SYSUTIP DD in the IPA Link step. If you are linking the application in a USS environment, you can control the size of this work file with the _CCN_IPA_WORK_SPACE environment variable. If particularly large source files are compiled with IPA, the default size of the compile-time work files might also need to be increased. These can be modified via the prefix_WORK_SPACE environment variables.