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1. Update C:\Cygwin\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/$TARGET
   export PATH=$PATH:$PREFIX/bin
   
   cd /opt/crosstool/src/build-eglibc
   find . -delete
   BUILD_CC=gcc \
   CC=$PREFIX/bin/$TARGET-gcc \
   CXX=$PREFIX/bin/$TARGET-g++ \
   AR=$PREFIX/bin/$TARGET-ar \
   RANLIB=$PREFIX/bin/$TARGET-ranlib \
   MAKEINFO=: \
   ../eglibc-2.13/configure \
       --prefix=/usr \
       --with-headers=$PREFIX/usr/include \
       --build=i686-pc-cygwin \
       --host=$TARGET \
       --enable-kernel=3.0.0 \
       --disable-profile --without-gd \
       --without-cvs --enable-add-ons
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to configure eglibc ==="
       exit 1
   fi
   make
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to make eglibc ==="
       exit 1
   fi
   make install_root=$PREFIX install
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to install eglibc ==="
       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. Run C:\Cygwin\opt\crosstool\src\build_gcc_cross.cmd and wait until it completes.
4. If there are no errors, shutdown Cygwin VM and make snapshot "SNAP-9".
5. Replace TARGET=arm-linux-gnueabihf with TARGET=arm-linux-gnueabi and ../eglibc-2.13/configure with ../eglibc-2.13.noarmhf/configure in C:\Cygwin\opt\crosstool\src\build_gcc_cross.sh, then run C:\Cygwin\opt\crosstool\src\build_gcc_cross.cmd and wait until it completes.
6. If there are no errors, shutdown Cygwin VM and make snapshot "SNAP-10".

Notes:

• Eglibc build will take a lot of time, 4-5 times more than binutils + gcc.
• "--enable-kernel" sets minimum version of Linux kernel for this eglibc to run on. 3.0.0 should be good for Raspberry Pi.
• "--prefix=/usr" is not dangerous and will not hurt your /usr in host system, unless you call "make install" in plain and wrong way. This is an old glibc/eglibc joke.
• If you didn't apply eglibc--cross-cygwin.diff patch, you will get the following error during build:
  gcc rpc_parse.c -c -D_RPC_THREAD_SAFE_ -D_CROSS_RPCGEN_ \
  -o /opt/crosstool/src/build-eglibc/sunrpc/cross-rpc_parse.o -MD -MP -MF /opt/crosstool
  /src/build-eglibc/sunrpc/cross-rpc_parse.o.dt -MT /opt/crosstool/src/build-eglibc/sunrpc/cross-rpc_parse.o
  In file included from rpc_parse.c:39:
  rpc/types.h:73: error: syntax error before "u_char"
  rpc/types.h:73: warning: useless keyword or type name in empty declaration
  rpc/types.h:73: warning: empty declaration
  rpc/types.h:74: error: syntax error before "u_short"
  rpc/types.h:74: warning: useless keyword or type name in empty declaration
  rpc/types.h:74: warning: empty declaration
  rpc/types.h:75: error: syntax error before "u_int"
  rpc/types.h:75: warning: useless keyword or type name in empty declaration
  rpc/types.h:75: warning: empty declaration
  rpc/types.h:76: error: syntax error before "u_long"
  rpc/types.h:76: warning: useless keyword or type name in empty declaration
  rpc/types.h:76: warning: empty declaration
  rpc/types.h:77: error: parse error before "quad_t"
  rpc/types.h:77: warning: data definition has no type or storage class
  rpc/types.h:78: error: parse error before "u_quad_t"
  rpc/types.h:78: warning: data definition has no type or storage class
  rpc/types.h:79: error: parse error before "fsid_t"
  rpc/types.h:79: warning: data definition has no type or storage class
  rpc/types.h:83: error: syntax error before "daddr_t"
  rpc/types.h:83: warning: useless keyword or type name in empty declaration
  rpc/types.h:83: warning: empty declaration
  rpc/types.h:84: error: syntax error before "caddr_t"
  rpc/types.h:84: warning: useless keyword or type name in empty declaration
  rpc/types.h:84: warning: empty declaration
  make[2]: *** [/opt/crosstool/src/build-eglibc/sunrpc/cross-rpc_parse.o] Error 1
  make[2]: Leaving directory `/opt/crosstool/src/eglibc-2.13/sunrpc'
  make[1]: *** [sunrpc/others] Error 2
  make[1]: Leaving directory `/opt/crosstool/src/eglibc-2.13'
  make: *** [all] Error 2
• Also you may get error message about various missing syscalls (__-prefixed) if you forgot to replace .oS with .oZ in makefiles (Cygwin case-insensitive filesystem).
• "timezone" subsystem will fail "make install" phase if you forgot to apply eglibc--cross-cygwin.diff patch. It includes updated Makefile for "timezone" subsystem from eglibc-2.15. The rest of "timezone" files were not updated.
• Some users report that make-3.82 can't build eglibc-2.13 and fails like this:
  sed: can't read libc.texinfo: No such file or directory
  make[2]: Entering directory `/opt/crosstool/src/eglibc-2.13/manual'
  Makefile:236: *** mixed implicit and normal rules. Stop.
  make[2]: Leaving directory `/opt/crosstool/src/eglibc-2.13/manual'
  make[1]: *** [manual/subdir_lib] Error 2
  make[1]: Leaving directory `/opt/crosstool/src/eglibc-2.13'
  make: *** [all] Error 2
  Revert to make-3.81 if you encountered this error.

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