why there are two executable gcc in my arm cross tool chain?

[Terry Guo]

Hi there,

I cross build a tool chain for arm-none-eabi targets and find there
are some executable files under folder:

arm-none-eabi/bin/
├── ar
├── as
├── c++
├── g++
├── gcc
├── ld
├── ld.bfd
├── nm
├── objcopy
├── objdump
├── ranlib
└── strip

While similar files under folder:
bin
├── arm-none-eabi-addr2line
├── arm-none-eabi-ar
├── arm-none-eabi-as
├── arm-none-eabi-c++
├── arm-none-eabi-c++filt
├── arm-none-eabi-cpp
├── arm-none-eabi-elfedit
├── arm-none-eabi-g++
├── arm-none-eabi-gcc
├── arm-none-eabi-gcc-4.7.4
├── arm-none-eabi-gcc-ar
├── arm-none-eabi-gcc-nm
├── arm-none-eabi-gcc-ranlib
├── arm-none-eabi-gcov
├── arm-none-eabi-gdb
├── arm-none-eabi-gdbtui
├── arm-none-eabi-gprof
├── arm-none-eabi-ld
├── arm-none-eabi-ld.bfd
├── arm-none-eabi-nm
├── arm-none-eabi-objcopy
├── arm-none-eabi-objdump
├── arm-none-eabi-ranlib
├── arm-none-eabi-readelf
├── arm-none-eabi-size
├── arm-none-eabi-strings
└── arm-none-eabi-strip

I know we use those under top level bin folder normally. But what's
the difference between those under arm-none-eabi/bin and those under
bin? Who will use those under folder arm-none-eabi/bin? Thanks for
your help.

BR,
Terry