gdb arm-elf-gdb

gdb和arm-elf-gdb只是针对的目标平台不一样

gdb 是This GDB was configured as "i686-pc-linux-gnu" 本机平台

arm-elf-gdb 是 This GDB was configured as "--host=i686-pc-linux-gnu --target=arm-elf". 目标平台是 arm-elf的