The absence of a arm-thumb interworking libgcc.a

[Rimpei Sosa]

 It seems that there is neither arm-interworking libgcc.a nor
thumb-interworking libgcc.a in gcc3.2.
In order to generate arm interworking libgcc.a and thumb interworking 
libgcc.a, what should I do?

--
As an example, here are two programs:
 main.c for main function using arm instructions set.
 foo.c for sub function called by main using thumb instructions set.

  $ cat main.c
  int foo(int,int);
  int main(void){
    return foo(9,4);
  }

  $cat foo.c
  int foo(int i,int j){
    return (i/j);
  }

after compiling them with :
  $ arm-linux-gcc -c -mthumb-interwork main.c

  $ arm-linux-gcc -c -mthumb -mthumb-interwork foo.c

I got an error message shown below from ld when linking with 
the devision routine in libgcc.a. 
  $ arm_v4t_le-gcc -mthumb-interwork main.o foo.o 
  /tools/lib/gcc-lib/arm-linux/3.2/../../../../arm-linux/bin/ld: Warning: /tools/l
  ib/gcc-lib/arm-linux/3.2/libgcc.a(_divsi3.o) does not support interworking, wher
  eas a.out does
  /tools/lib/gcc-lib/arm-linux/3.2/../../../../arm-linux/bin/ld: Warning: /tools/l
  ib/gcc-lib/arm-linux/3.2/libgcc.a(_dvmd_lnx.o) does not support interworking, wh
  ereas a.out does
  /tools/lib/gcc-lib/arm-linux/3.2/../../../../arm-linux/bin/ld: Warning: /tools/l
  ib/gcc-lib/arm-linux/3.2/crtend.o does not support interworking, whereas a.out d
  oes
  /tools/lib/gcc-lib/arm-linux/3.2/../../../../arm-linux/bin/ld: Warning: /tools/l
  ib/gcc-lib/arm-linux/3.2/../../../../arm-linux/lib/crtn.o does not support inter
  working, whereas a.out does
  /tools/lib/gcc-lib/arm-linux/3.2/../../../../arm-linux/bin/ld: /tools/lib/gcc-li
  b/arm-linux/3.2/libgcc.a(_divsi3.o)(__divsi3): warning: interworking not enabled
  .
  /tools/lib/gcc-lib/arm-linux/3.2/../../../../arm-linux/bin/ld:   first occurrenc
  e: foo.o: thumb call to arm
  foo.o: In function `foo':
  foo.o(.text+0x1a): internal error: dangerous error


I guess if I can get libgcc.a compiled with -mthumb-interwork or
-mthumb -mthumb-interwork , it all should work out. 

Then, I have a look at ~/rpm/BUILD/gcc-3.2/gcc/config/arm/t-arm-elf
and find these three lines are already uncommented:

  MULTILIB_OPTIONS     = marm/mthumb
  MULTILIB_DIRNAMES    = arm thumb
  MULTILIB_EXCEPTIONS  =

which means interworking libgcc.a is supporsed to exist.

Any advice would be appreciated,
Rimpei Sosa.