arm-elf gcc 4.2.0 with interwork

[Dirk Behme <dirk dot behme at googlemail dot com>]

Hi,

I built arm-elf gcc 4.2.0 with newlib and afterwards found that
ARM/Thumb interwork wasn't enabled:

lib/gcc/arm-elf/4.2.0/../../../../arm-elf/lib/thumb/libm.a(lib_a-s_atan.o) 


does not support interworking, whereas ap/ap.elf does

  > arm-elf-gcc -print-multi-lib
.;
thumb;@mthumb

Then, I enabled ARM/Thumb interwork in gcc/config/arm/t-arm-elf using
patch in attachment and then get

 > arm-elf-gcc -print-multi-lib
.;
thumb;@mthumb
interwork;@mthumb-interwork
thumb/interwork;@mthumb@mthumb-interwork

and everything looks fine.

Is this the correct way to enable ARM/Thumb interwork? If yes, why is
it disabled by default?

Using Google there seem to be GCC configure options --enable-mulitlib
and --enable-interwork as well. But a full text search for these
options over GCC 4.2.0 sources doesn't match anything. Are these
options still necessary?

Cheers

Dirk
--- ./gcc/config/arm/t-arm-elf_orig	2007-05-27 11:00:22.000000000 +0200
+++ ./gcc/config/arm/t-arm-elf	2007-05-27 11:00:28.000000000 +0200
@@ -22,10 +22,10 @@ MULTILIB_MATCHES     =
 # MULTILIB_OPTIONS    += mhard-float/msoft-float
 # MULTILIB_DIRNAMES   += fpu soft
 # MULTILIB_EXCEPTIONS += *mthumb/*mhard-float*
-# 
-# MULTILIB_OPTIONS    += mno-thumb-interwork/mthumb-interwork
-# MULTILIB_DIRNAMES   += normal interwork
-# 
+ 
+MULTILIB_OPTIONS    += mno-thumb-interwork/mthumb-interwork
+MULTILIB_DIRNAMES   += normal interwork
+ 
 # MULTILIB_OPTIONS    += fno-leading-underscore/fleading-underscore
 # MULTILIB_DIRNAMES   += elf under
 # 


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