IBM Open XL Compiler Flags, Common Operating System Commands and Environment Settings

Compilers: IBM Open XL C/C++ for AIX 17.1.0

Compilers: IBM Open XL Fortran for AIX 17.1.0

Libraries: tcmalloc version 2.7.1 + IBM AIX enablement patch Available for download at :

Tcmalloc library has been built with IBM XL 16.1.0 with the compiler flags -O3 -qmaxmem=-1, where -qmaxmem=-1 permits each optimization to take as much memory as it needs without checking for limits

Operating systems: AIX V7.2 Technology Level 5, Service Pack 3 running on Power10 in Power9 compatibility mode


Selecting one of the following will take you directly to that section:

Optimization Flags

Portability Flags

Compiler Flags