-qinitauto

In IBM® XL C/C++ for AIX® 16.1.0 or earlier releases, the -qinitauto option initializes uninitialized automatic variables to a specific value for debugging purposes.

In IBM Open XL C/C++ for AIX 17.1.2, the -ftrivial-auto-var-init=pattern option can be used to improve the reproducibility of issues that are caused by using uninitialized variables. However, unlike -qinitauto, you cannot specify the value to be assigned to an uninitialized automatic variable.