MULTILIB_EXCEPTIONS and MULTILIB_MATCHES options in t-amr-elf?

[Cliff Tsai]

Hi:
    
    When configure gcc and multilib,I must 
modify the text file : t-arm-elf
    But in t-amr-elf,MULTILIB_EXCEPTIONS and 
MULTILIB_MATCHES
    is empty here. But I see t-m68kelf,they are not 
empty!
 
    I wanna what these 
field means!And what "LIBGCC = stmp-multilib" means?
 
   B.R 
 
  Cliff