gdb 的 multiarch

##gdb可以用同一個版本支持x86，ppc等多種體系結構。

• 編譯方法：

#tar xf gdb-6.8a.tar.bz2
#cd gdb-6.8/
#./configure  --enable-targets=all
#make
#gdb/gdb
GNU gdb 6.8
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
(gdb) set architecture ?
Undefined item: "?".
(gdb) set architecture
Display all 204 possibilities? (y or n)
alpha                          m68k:isa-c:nodiv:mac
alpha:ev4                      m88k:88100
alpha:ev5                      mep
alpha:ev6                      mips
am33                           mips:10000
am33-2                         mips:12000
arm                            mips:16
armv2                          mips:3000
armv2a                         mips:3900
armv3                          mips:4000
armv3m                         mips:4010
armv4                          mips:4100
armv4t                         mips:4111
armv5                          mips:4120
armv5t                         mips:4300
armv5te                        mips:4400
auto                           mips:4600
avr                            mips:4650
avr:1                          mips:5000
avr:2                          mips:5400
avr:3                          mips:5500
avr:4                          mips:6000
avr:5                          mips:7000
avr:6                          mips:8000
cris                           mips:9000
cris:common_v10_v32            mips:isa32
crisv32                        mips:isa32r2
ep9312                         mips:isa64
fr300                          mips:isa64r2
fr400                          mips:loongson_2e
fr450                          mips:loongson_2f
fr500                          mips:mips5
fr550                          mips:octeon
frv                            mips:sb1
h1                             mn10300
h8300                          ms1
h8300h                         ms1-003
h8300hn                        ms2
h8300s                         powerpc:403
h8300sn                        powerpc:601
h8300sx                        powerpc:603
h8300sxn                       powerpc:604
hppa1.0                        powerpc:620
i386                           powerpc:630
i386:intel                     powerpc:7400
i386:x86-64                    powerpc:750
i386:x86-64:intel              powerpc:EC603e
i8086                          powerpc:MPC8XX
ia64-elf32                     powerpc:a35
ia64-elf64                     powerpc:common
iq10                           powerpc:common64
iq2000                         powerpc:e500
iwmmxt                         powerpc:rs64ii
iwmmxt2                        powerpc:rs64iii
m16c                           rs6000:6000
m32c                           rs6000:rs1
m32r                           rs6000:rs2
m32r2                          rs6000:rsc
m32rx                          s390:31-bit
m68hc11                        s390:64-bit
m68hc12                        score
m68k                           sh
m68k:5200                      sh-dsp
m68k:5206e                     sh2
m68k:521x                      sh2a
m68k:5249                      sh2a-nofpu
m68k:528x                      sh2a-nofpu-or-sh3-nommu
m68k:5307                      sh2a-nofpu-or-sh4-nommu-nofpu
m68k:5407                      sh2a-or-sh3e
m68k:547x                      sh2a-or-sh4
m68k:548x                      sh2e
m68k:68000                     sh3
m68k:68008                     sh3-dsp
m68k:68010                     sh3-nommu
m68k:68020                     sh3e
m68k:68030                     sh4
m68k:68040                     sh4-nofpu
m68k:68060                     sh4-nommu-nofpu
m68k:cfv4e                     sh4a
m68k:cpu32                     sh4a-nofpu
m68k:fido                      sh4al-dsp
m68k:isa-a                     sh5
m68k:isa-a:emac                simple
m68k:isa-a:mac                 sparc
m68k:isa-a:nodiv               sparc:sparclet
m68k:isa-aplus                 sparc:sparclite
m68k:isa-aplus:emac            sparc:sparclite_le
m68k:isa-aplus:mac             sparc:v8plus
m68k:isa-b                     sparc:v8plusa
m68k:isa-b:emac                sparc:v8plusb
m68k:isa-b:float               sparc:v9
m68k:isa-b:float:emac          sparc:v9a
m68k:isa-b:float:mac           sparc:v9b
m68k:isa-b:mac                 spu:256K
m68k:isa-b:nousp               tomcat
m68k:isa-b:nousp:emac          v850
m68k:isa-b:nousp:mac           v850e
m68k:isa-c                     v850e1
m68k:isa-c:emac                vax
m68k:isa-c:mac                 xscale
m68k:isa-c:nodiv               xstormy16
m68k:isa-c:nodiv:emac          xtensa