https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64081
--- Comment #40 from Aldy Hernandez <aldyh at gcc dot gnu.org> --- I am correct to assume that there is no workable debugger capable of debugging gcc on our AIX boxes? power8-aix:~/bisect-succeeds/gcc$ gdb cc1 GNU gdb (GDB) 7.8.2 Copyright (C) 2014 Free Software Foundation, Inc. ... ... (gdb) break main Breakpoint 5 at 0x10000394: file _start_ , line 37. (gdb) run Starting program: /home/aldyh/bisect-succeeds/gcc/cc1 Breakpoint 5, main (argc=<error reading variable>, argv=<error reading variable>) at _start_ :37 37 _start_ : A file or directory in the path name does not exist.. (gdb) list 32 in _start_ (gdb) next 35 in _start_ (gdb) next 37 in _start_ (gdb) I also tried dbx, which doesn't seem very willing to even load cc1.