Re: [PATCH 1/2] gdb: introduce command "info architecture"

[Guinevere Larsen <guinevere@redhat.com>]

On 11/6/25 8:24 PM, Maciej W. Rozycki wrote:
> On Thu, 6 Nov 2025, Guinevere Larsen wrote:
>
>> There is no convenient way to tell a user how to check which
>> architectures are supported by their build of GDB.  This hasn't really
>> been a problem, but now that GDB isn't ported to Apple's new CPU
>> architectures, a user could run into a situation where they're trying to
>> debug an unsupported CPU.
>   Umm, doesn't `set architecture' do the right job?
>
> (gdb) set architecture
> Requires an argument. Valid arguments are ARC600, A6, ARC601, ARC700, A7, ARCv2, EM, HS, arm, armv2, armv2a, armv3, armv3m, armv4, armv4t, armv5, armv5t, armv5te, xscale, iwmmxt, iwmmxt2, armv5tej, armv6, armv6kz, armv6t2, armv6k, armv7, armv6-m, armv6s-m, armv7e-m, armv8-a, armv8-r, armv8-m.base, armv8-m.main, armv8.1-m.main, armv9-a, arm_any, avr, avr:1, avr:2, avr:25, avr:3, avr:31, avr:35, avr:4, avr:5, avr:51, avr:6, avr:100, avr:101, avr:102, avr:103, avr:104, avr:105, avr:106, avr:107, bfin, cris, crisv32, cris:common_v10_v32, csky, csky:ck510, csky:ck610, csky:ck801, csky:ck802, csky:ck803, csky:ck807, csky:ck810, csky:ck860, csky:any, frv, tomcat, simple, fr550, fr500, fr450, fr400, fr300, ft32, ft32b, h8300, h8300h, h8300s, h8300hn, h8300sn, h8300sx, h8300sxn, hppa1.0, i386, i386:x86-64, i386:x64-32, i8086, i386:intel, i386:x86-64:intel, i386:x64-32:intel, iq2000, iq10, lm32, m16c, m32c, m32r, m32rx, m32r2, m68hc11, m68hc12, m68hc12:HCS12, m68k, m68k:68000, m68k:68008, m68k
>   :68010, m68k:68020, m68k:68030, m68k:68040, m68k:68060, m68k:cpu32, m68k:fido, m68k:isa-a:nodiv, m68k:isa-a, m68k:isa-a:mac, m68k:isa-a:emac, m68k:isa-aplus, m68k:isa-aplus:mac, m68k:isa-aplus:emac, m68k:isa-b:nousp, m68k:isa-b:nousp:mac, m68k:isa-b:nousp:emac, m68k:isa-b, m68k:isa-b:mac, m68k:isa-b:emac, m68k:isa-b:float, m68k:isa-b:float:mac, m68k:isa-b:float:emac, m68k:isa-c, m68k:isa-c:mac, m68k:isa-c:emac, m68k:isa-c:nodiv, m68k:isa-c:nodiv:mac, m68k:isa-c:nodiv:emac, m68k:5200, m68k:5206e, m68k:5307, m68k:5407, m68k:528x, m68k:521x, m68k:5249, m68k:547x, m68k:548x, m68k:cfv4e, mep, h1, c5, MicroBlaze, mn10300, am33, am33-2, moxie, msp:14, MSP430, MSP430x11x1, MSP430x12, MSP430x13, MSP430x14, MSP430x15, MSP430x16, MSP430x20, MSP430x21, MSP430x22, MSP430x23, MSP430x24, MSP430x26, MSP430x31, MSP430x32, MSP430x33, MSP430x41, MSP430x42, MSP430x43, MSP430x44, MSP430x46, MSP430x47, MSP430x54, MSP430X, n1, n1h, n1h_v2, n1h_v3, n1h_v3m, or1k, or1knd, rl78, rs6000:6000, rs6000:rs1, rs60
>   00:rsc, rs6000:rs2, powerpc:common, powerpc:common64, 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, rx, rx:v2, rx:v3, s12z, s390:31-bit, s390:64-bit, sh, sh2, sh2e, sh-dsp, sh3, sh3-nommu, sh3-dsp, sh3e, sh4, sh4a, sh4al-dsp, sh4-nofpu, sh4-nommu-nofpu, sh4a-nofpu, sh2a, sh2a-nofpu, sh2a-nofpu-or-sh4-nommu-nofpu, sh2a-nofpu-or-sh3-nommu, sh2a-or-sh4, sh2a-or-sh3e, sparc, sparc:sparclet, sparc:sparclite, sparc:v8plus, sparc:v8plusa, sparc:sparclite_le, sparc:v9, sparc:v9a, sparc:v8plusb, sparc:v9b, sparc:v8plusc, sparc:v9c, sparc:v8plusd, sparc:v9d, sparc:v8pluse, sparc:v9e, sparc:v8plusv, sparc:v9v, sparc:v8plusm, sparc:v9m, sparc:v8plusm8, sparc:v9m8, tic6x, v850:old-gcc-abi, v850e3v5:old-gcc-abi, v850e2v4:old-gcc-abi, v850e2v3:old-gcc-abi, v8
>   50e2:old-gcc-abi, v850e1:old-gcc-abi, v850e:old-gcc-abi, v850:rh850, v850e3v5, v850e2v4, v850e2v3, v850e2, v850e1, v850e, v850-rh850, vax, xstormy16, xtensa, z80, z80-strict, z80-full, r800, gbz80, z180, z80n, ez80-z80, ez80-adl, aarch64, aarch64:llp64, aarch64:ilp32, aarch64:armv8-r, alpha, alpha:ev4, alpha:ev5, alpha:ev6, bpf, xbpf, ia64-elf64, ia64-elf32, Loongarch64, Loongarch32, mips, mips:3000, mips:3900, mips:4000, mips:4010, mips:4100, mips:4111, mips:4120, mips:4300, mips:4400, mips:4600, mips:4650, mips:5000, mips:5400, mips:5500, mips:5900, mips:6000, mips:7000, mips:8000, mips:9000, mips:10000, mips:12000, mips:14000, mips:16000, mips:16, mips:mips5, mips:isa32, mips:isa32r2, mips:isa32r3, mips:isa32r5, mips:isa32r6, mips:isa64, mips:isa64r2, mips:isa64r3, mips:isa64r5, mips:isa64r6, mips:sb1, mips:loongson_2e, mips:loongson_2f, mips:gs464, mips:gs464e, mips:gs264e, mips:octeon, mips:octeon+, mips:octeon2, mips:octeon3, mips:xlr, mips:interaptiv-mr2, mips:allegrex, mips:
>   micromips, riscv, riscv:rv64, riscv:rv32, tilegx, tilegx32, auto.
> (gdb)
>
> Or am I missing something?  Of course adding filtering might be useful,
> especially if the list so large as in my quoted example, but the change
> description suggests there's no listing facility available.

Well, I wouldn't say we have a listing facility. using Set Architecture 
without an argument may list them, but that is an error message, rather 
than a command to do that, which is why I don't think it is a convenient 
way to tell a user to check for support. You could achieve the same if 
you asked for completion, but again, not a "listing facility" in the 
sense of telling a user to check.

This is mostly inspired by the second patch, where the error tells you 
how to get a list of supported CPUs, and I think that having a hint that 
uses an incorrect command is not great.

>
>    Maciej
>
>

-- 
Cheers,
Guinevere Larsen
It/she