[Bug tdep/20951] New: Some architectures are not recognized in command "set architecture"

["qiyao at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20951

            Bug ID: 20951
           Summary: Some architectures are not recognized in command "set
                    architecture"
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tdep
          Assignee: unassigned at sourceware dot org
          Reporter: qiyao at gcc dot gnu.org
  Target Milestone: ---

"set architecture" shows some valid arguments,

(gdb) set architecture 
Requires an argument. Valid arguments are rs6000:6000, rs6000:rs1, rs6000:rsc,
rs6000:rs2, powerpc:common64, powerpc:common, powerpc:603, powerpc:EC603e,
powerpc:604, powerpc:403, powerpc:601, powerpc:620, powerpc:630, powerpc:a35,
powerpc:rs64ii, powerpc:rs64iii, powerpc:7400, powerpc:e500, powerpc:e500mc,
powerpc:e500mc64, powerpc:MPC8XX, powerpc:750, powerpc:titan, powerpc:vle,
powerpc:e5500, powerpc:e6500, auto.

but some of them are not recognized.

(gdb) set architecture powerpc:e500mc
Architecture `powerpc:e500mc' not recognized.
The target architecture is set automatically (currently rs6000:6000)
(gdb) set architecture powerpc:EC603e
Architecture `powerpc:EC603e' not recognized.
The target architecture is set automatically (currently rs6000:6000)
(gdb) set architecture powerpc:e500mc64
Architecture `powerpc:e500mc64' not recognized.
The target architecture is set automatically (currently rs6000:6000)
(gdb) set architecture powerpc:titan
Architecture `powerpc:titan' not recognized.
The target architecture is set automatically (currently rs6000:6000)
(gdb) set architecture powerpc:vle
Architecture `powerpc:vle' not recognized.
The target architecture is set automatically (currently rs6000:6000)
(gdb) set architecture powerpc:e5500
Architecture `powerpc:e5500' not recognized.
The target architecture is set automatically (currently rs6000:6000)
(gdb) set architecture powerpc:e6500
Architecture `powerpc:e6500' not recognized.
The target architecture is set automatically (currently rs6000:6000)

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