Cross compiler libgcc.a with -mthumb-interwork

[Jani Monoses]

John Carter wrote:
> I'm trying to create a cross compiler hosted on i386 linux targetting an 
> embedded arm thumb device with thumb-interworking on.

You need to the modify gcc-4.X/gcc/config/arm/t-arm-elf file to enable multilib for thumb 
interworking before building gcc. For gcc 4.0 targetting eCos I had to add the following 
patch.
I think that by default they are not enabled (just as BE support isn't) so the resulting 
build remains relatively small as each variant of the supporting libraries under 
installdir/arm-elf/lib is about 15Mb.

--- o	2004-09-01 14:14:21.000000000 +0300
+++ t-arm-elf	2005-05-19 12:54:41.000000000 +0300
@@ -23,8 +23,8 @@
  # 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