The minimum supported version of AIX for GDB will be 7.2 TL5 as mentioned in the below link.
https://www.ibm.com/support/pages/aix-support-lifecycle-information
Approved-By: Ulrich Weigand <Ulrich.Weigand@de.ibm.com>
deprecated since GDB 10. Users who need to control the size of a
memory port's internal buffer can use the 'setvbuf' procedure.
+* Removed targets and native configurations
+
+ GDB no longer supports AIX 7.1. The minimum supported
+ AIX version is now AIX 7.2 TL5. GDB will only support
+ DWARF debugging in AIX, going forward.
+
*** Changes in GDB 17
* Debugging Linux programs that use x86-64 or x86-64 with 32-bit pointer