Crosscompile of ecjx fails

I'm doing a canadian cross with build=x86_64-linux, host=mingw32,
target=arm-eabi. Everything is fine, except gcj. For some reason, when I
compile ecjx, it uses "target" to compile ecjx.o and "host" to compile ecjx:

$ make ecjx
depbase=`echo ecjx.o | sed 's|[^/]*$|.deps/&|;s|\.o$||'`; \
        if arm-eabi-c++  -DHAVE_CONFIG_H -I. -I../../../../gcc-4.4.0/libjava
-I./include -I./gcj  -I../../../../gcc-4.4.0/libjava -Iinclude
-I../../../../gcc-4.4.0/libjava/include
-I../../../../gcc-4.4.0/libjava/classpath/include -Iclasspath/include
-I../../../../gcc-4.4.0/libjava/classpath/native/fdlibm
-I../../../../gcc-4.4.0/libjava/../boehm-gc/include -I../boehm-gc/include  
-I../../../../gcc-4.4.0/libjava/.././libjava/../gcc
-I../../../../gcc-4.4.0/libjava/../zlib   -fno-rtti -fnon-call-exceptions 
-fdollars-in-identifiers -Wswitch-enum -D_FILE_OFFSET_BITS=64 -Wextra -Wall
-D_GNU_SOURCE -DPREFIX="\"/home/ecosta/devkitpro/devkitARM\""
-DTOOLEXECLIBDIR="\"/home/ecosta/devkitpro/devkitARM/arm-eabi/lib\""
-DJAVA_HOME="\"/home/ecosta/devkitpro/devkitARM\""
-DBOOT_CLASS_PATH="\"/home/ecosta/devkitpro/devkitARM/share/java/libgcj-4.4.0.jar\""
-DJAVA_EXT_DIRS="\"/home/ecosta/devkitpro/devkitARM/share/java/ext\""
-DGCJ_ENDORSED_DIRS="\"/home/ecosta/devkitpro/devkitARM/share/java/gcj-endorsed\""
-DGCJ_VERSIONED_LIBDIR="\"/home/ecosta/devkitpro/devkitARM/lib/gcj-4.4.0-10\""
-DPATH_SEPARATOR="\":\""
-DECJ_JAR_FILE="\"/home/ecosta/devkitpro/devkitARM/libexec/ecj-4.3.jar\""
-DLIBGCJ_DEFAULT_DATABASE="\"/home/ecosta/devkitpro/devkitARM/lib/gcj-4.4.0-10/classmap.db\""
-DLIBGCJ_DEFAULT_DATABASE_PATH_TAIL="\"gcj-4.4.0-10/classmap.db\"" -g -O2  
-MT ecjx.o -MD -MP -MF "$depbase.Tpo" -c -o ecjx.o
../../../../gcc-4.4.0/libjava/ecjx.cc; \
        then mv -f "$depbase.Tpo" "$depbase.Po"; else rm -f "$depbase.Tpo";
exit 1; fi
mingw32-gcj -o ecjx -findirect-dispatch
--main=org.eclipse.jdt.internal.compiler.batch.GCCMain  ecjx.o
/home/ecosta/cross/lib/gcc/mingw32/4.4.0/../../../../mingw32/bin/ld: unknown
architecture of input file `ecjx.o' is incompatible with i386 output
collect2: ld returned 1 exit status
make: *** [ecjx] Error 1

Shouldn't it use "mingw32-c++" and "mingw32-gcj"? Why it uses "arm-eabi-c++"
instead?

BTW, when I crosscompiled the mingw32 toolchain, I got the same problem (it
uses "native-g++" to compile ecjx.o and "mingw32-gcj" to compile ecjx). This
I solved by not compiling java... :)

An ugly workaround is compile it with:

make CXX=mingw-c++ ecjx

It generates a windows executable (without the .exe extension) - nasty, but
works...

Configured with:

CFLAGS_FOR_TARGET="-O2" ../gcc-*/configure \
  --build=x86_64-redhat-linux --host=mingw32 --target=arm-eabi \
  --prefix=/home/ecosta/cross --disable-nls \
  --enable-languages=c,c++,objc,java \
  --with-cpu=arm7tdmi\
  --enable-interwork --disable-multilib \
  --with-gcc --with-gnu-ld --with-gnu-as \
  --disable-shared --disable-threads --disable-win32-registry --disable-nls
--disable-debug \
  --disable-libmudflap --disable-libssp --disable-libgomp \
  --disable-libstdcxx-pch \
  --enable-libgcj
  --disable-getenv-properties --disable-hash-synchronization
--disable-interpreter
  --disable-java-net --disable-jvmpi --enable-reduced-reflection
--without-libffi --without-x \
  --with-ecj-jar=/home/ecosta/cross/libexec/ecj-4.3.jar  \
  --with-newlib \
  --without-headers \

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