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Now it's time to replace second bootstrapping compiler with full-featured compiler tied to eglibc and capable of building hosted code, not only freestanding code. Also new compiler will be independent from cygwin1.dll, unlike the old one.

1. Update C:\MinGW\msys\1.0\opt\crosstool\src\build_gcc_cross.sh :

   #!/bin/bash
   export TARGET=arm-linux-gnueabihf
   export PREFIX=/opt/crosstool/gcc-4.6.3-eglibc-2.13/$TARGET
   
   cd /opt/crosstool/src/build-binutils
   find . -delete
   ../binutils-2.22/configure --target=$TARGET \
       --prefix=$PREFIX --with-sysroot=$TARGET \
       --disable-nls --with-arch=armv6
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to configure binutils ==="
       exit 1
   fi
   make all
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to make binutils ==="
       exit 1
   fi
   make install
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to install binutils ==="
       exit 1
   fi
   
   export PATH=$PATH:$PREFIX/bin
   cd /opt/crosstool/src/build-gcc
   find . -delete
   ../gcc-4.6.3/configure --target=$TARGET --prefix=$PREFIX \
       --with-arch=armv6 --with-fpu=vfp --with-float=hard \
       --with-sysroot=$PREFIX \
       --disable-sjlj-exceptions --enable-checking=release \
       --enable-linker-build-id --enable-gnu-unique-object \
       --disable-nls --enable-languages=c,c++ \
       --with-headers --enable-shared --enable-threads=posix \
       --disable-multilib -enable-__cxa_atexit \
       --disable-libmudflap --disable-libssp \
       --disable-libgomp --without-ppl --without-cloog \
       --with-gmp=/usr/local --with-mpfr=/usr/local \
       --with-mpc=/usr/local
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to configure gcc ==="
       exit 1
   fi
   make
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to make gcc ==="
       exit 1
   fi
   make install
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to install gcc ==="
       exit 1
   fi
   
   echo "=== build script: OK ==="
   
   

2. You may need to reapply dos2unix to build_gcc_cross.sh if your text editor does not preserve DOS/Unix line endings.
3. Put C-style comments /* */ around "#define caddr_t char *" line in C:\MinGW\msys\1.0\opt\crosstool\src\gcc-4.6.3\gcc\configure to prevent caddr_t-related error in sys/types.h during GCC build.
4. Run C:\MinGW\msys\1.0\opt\crosstool\src\build_gcc_cross.cmd and wait until it completes.
5. If there are no errors, shutdown the MinGW VM and make snapshot "SNAP-D".

Notes:

• There may be an error in $TARGET/usr/include/sys/types.h when building GCC (in the line "typedef __caddr_t caddr_t;"). Reason: you forgot to patch GCC configure script as described above.
• Multilib is a special feature of GCC to allow building 32-bit targets on x86_64 platform. It's useless on ARM.
• If you didn't specify --with-sysroot=$PREFIX configure argument, you will get the following error during build:
  
  In file included from ../../../gcc-4.6.3/libgcc/../gcc/libgcc2.c:29:0:
  ../../../gcc-4.6.3/libgcc/../gcc/tsystem.h:87:19: fatal error: stdio.h: No such file or directory
  compilation terminated.
  make[2]: *** [_muldi3.o] Error 1
  make[2]: Leaving directory `/opt/crosstool/src/build-gcc/arm-linux-gnueabihf/libgcc'
  make[1]: *** [all-target-libgcc] Error 2
  make[1]: Leaving directory `/opt/crosstool/src/build-gcc'
  make: *** [all] Error 2
   

Additional steps to support SoftFP ABI:

1. Replace TARGET=arm-linux-gnueabihf with TARGET=arm-linux-gnueabi and ../gcc-4.6.3/configure with ../gcc-4.6.3.noarmhf/configure in build_gcc_cross.sh
2. binutils configure flags: --with-arch=armv4t
3. gcc configure flags: --with-arch=armv4t --with-float=soft. Also remove --with-fpu=vfp.
4. You may need to reapply dos2unix to build_gcc_cross.sh if your text editor does not preserve DOS/Unix line endings.
5. Run C:\MinGW\msys\1.0\opt\crosstool\src\build_gcc_cross.cmd and wait until it completes.
6. If there are no errors, shutdown the MinGW VM and make snapshot "SNAP-E".

>> Read next section or buy already prepared cross-compiler (€10) to save your time.