From Fedora Project Wiki

Stack space needed

For each function, record the worst-case stack space use, or “unbounded” if recursion, unbounded alloca, or unbounded variable-length arrays (VLAs) are involved. (Merging information from multiple DSOs is hard once cross-translation-unit function calls are involved.)

This is probably not that important to Fedora, but could help embedded use cases. It may also be relevant to stack overflow checking.