Daily Report: Compiling MLDonkey for Windows

MLDonkey is a nifty program that helps you share files with other people. MLDonkey works on Linux, but the Windows version I downloaded didn't work on my computer running Windows XP. So I compiled MLDonkey using Cygwin's mingw64-i686-gcc-* compiler toolchain. Here I show how I did it. Part of the information below is taken from the MLDonkey Windows guide.

Cygwin Setup

First, install Cygwin using the Cygwin installer(setup.exe). I set the Root directory to C:\Cygwin and chose to install the following packages in addition to base packages.
- bison
- gettext-devel
- libtool
- make
- mingw64-i686-binutils
- mingw64-i686-gcc-core
- mingw64-i686-gcc-fortran
- mingw64-i686-gcc-g++
- patch
- pkg-config

C:\Cygwin\etc\fstab

/usr/i686-w64-mingw32/sys-root/mingw /mingw none bind

Set the HOME variable.

Start the Cygwin terminal and type the following commands to set up Cygwin for Windows compilation.

cp /usr/bin/i686-w64-mingw32-g++.exe /usr/i686-w64-mingw32/bin/g++.exe
cp /usr/bin/i686-w64-mingw32-gcc.exe /usr/i686-w64-mingw32/bin/gcc.exe
cp /usr/bin/i686-w64-mingw32-cpp.exe /usr/i686-w64-mingw32/bin/cpp.exe
export PATH=/mingw/bin:/usr/i686-w64-mingw32/bin:/usr/local/bin:/usr/bin:/usr/lib/gcc/i686-w64-mingw32/4.5.3
export CC=/usr/bin/i686-w64-mingw32-gcc.exe
export PKG_CONFIG_PATH=/mingw/lib/pkgconfig

Compile zlib and bzip2

Download the zlib source (zlib-1.2.7.tar.gz) and unpack it.

tar xzvf zlib-1.2.7.tar.gz
cd zlib-1.2.7

Compile and install zlib.

make -f win32/Makefile.gcc
cp -iv zlib1.dll /mingw/bin
cp -iv zconf.h zlib.h /mingw/include
cp -iv libz.a /mingw/lib
cp -iv libz.dll.a /mingw/lib

Now download bzip2 source from bzip2.org and unpack it.

tar xzvf bzip2-1.0.6.tar.gz
cd bzip2-1.0.6

Change line 78 of bzlib.h to read:

#if defined(_WIN32) && !defined(__MINGW32__)

Compile and install bzip2.

make
cp bzlib.h /mingw/include/
cp libbz2.a /mingw/lib

libiconv

Download and compile libiconv:

tar xzvf libiconv-1.14.tar.gz
cd libiconv-1.14
./configure --build=i686-w64-mingw32 --prefix=/mingw --enable-static
make
make install

JPEG, PNG & Freetype

Compile JPEG, libPNG and Freetype in the following way:
```
./configure --build=i686-w64-mingw32 --prefix=/mingw
make
make install
```

GD Graphics Library

Now get the libgd source, unpack and configure:

./configure --build=i686-w64-mingw32 --prefix=/mingw LIBS="-lbz2 -ljpeg -lws2_32 -liconv"

Once Makefile is generated, change line 233 to read:

DEFS = -DHAVE_CONFIG_H -DBGDWIN32

Also fix gd.h near line 25:

--- ./gd.h      Sat Oct 30 12:54:58 2004
+++ ./gd.h Sun Jan 05 17:56:09 2006
@@ -24,7 +24,7 @@
 #endif /* WIN32 */

 #ifdef NONDLL
-#define BGD_DECLARE(rt) extern rt
+#define BGD_DECLARE(rt) extern rt _stdcall
 #else
 #ifdef BGDWIN32
 #define BGD_DECLARE(rt) __declspec(dllexport) rt __stdcall

Then, build and install gdlib:

make install

To create a DLL file called libgd-2.dll, run the following commands:

mkdir /tmp/gdlib
cd /tmp/gdlib
ar x /mingw/lib/libgd.a
gcc -shared -o /mingw/bin/libgd-2.dll -Wl,--out-implib,libgd.dll.a *.o -L/mingw/lib -lz -lbz2 -ljpeg -lpng -liconv -lfreetype

wget

Build wget as shown in this post. If you don't want to compile wget yourself, get the executable (wget.exe) somewhere, and put it in the same folder as mlnet.exe later.

regex and libmagic

Download regex-0.12.tar.gz and compile regex as required by libmagic.

gcc -DSTDC_HEADERS -DHAVE_STRING_H=1 -I. -c regex.c
ar ru libregex.a regex.o
cp -iv libregex.a /mingw/lib
cp -iv libregex.a /mingw/lib/libgnurx.a
cp -iv regex.h /mingw/include

Get the source tarball of open-source file command. Configure as follows:

./configure --build=i686-w64-mingw32 --prefix=/mingw

Open config.h and add the following lines:

#define WIN32 1
#define MAGIC "magic"

Then compile:

make && make install

OCaml

You need flexdll (flexdll-0.27.zip) to build OCaml. Extract it to /mingw/bin. Then, download the latest OCaml source (3.12.1). Patch ocaml with this Unicode patch.

tar xzvf ocaml-3.12.1.tar.gz
cd ocaml-3.12.1
patch -p1 -l < ../ocaml-3.12.1-unicode.patch

In the config subfolder, copy Makefile.mingw to Makefile.

cp config/m-nt.h config/m.h 
cp config/s-nt.h config/s.h 
cp config/Makefile.mingw config/Makefile

Begin compiling OCaml.

make -f Makefile.nt world
make -f Makefile.nt opt
make -f Makefile.nt opt.opt
make -f Makefile.nt install

Set up OCaml environment variables:

export CAMLLIB=/mingw/lib
export OCAMLLIB=/mingw/lib
export CAMLP4LIB=/mingw/lib/camlp4

Build MLDonkey

Get the MLDonkey source, then unpack and configure it.
```
tar xjvf mldonkey-3.1.0.tar.bz2
cd mldonkey-3.1.0
./configure --build=i686-w64-mingw32 --prefix=/mingw --disable-fasttrack
```
To link with the static GD library, append -DNONDLL to the CPPFLAG line of config/Makefile.config
```
CPPFLAGS=-I/mingw/include -DNONDLL
```
Start compilation.
```
export OCAML_SRC=~/ocaml-3.12.1
cp -iv /mingw/lib/stublibs/dllunix.dll .
make depend
make mlnet.static 
strip mlnet.static 
mv mlnet.static mlnet.exe
```
If the final linking stage fails, here is the command I used to produce mlnet.exe:

g++ -g0 -O3 -o mlnet.exe -Wl,--subsystem,windows -L/lib/gcc/i686-w64-mingw32/4.5.3 -L/mingw/lib /tmp/camlstartup00193d.s build/flexdll_mingw.o /mingw/lib/std_exit.o src/daemon/common/commonMain.o build/driver.a build/core.a build/client.a build/common.a build/magic.a build/bitstring.a build/cdk.a build/extlib.a /mingw/lib/nums.a /mingw/lib/str.a /mingw/lib/unix.a /mingw/lib/bigarray.a /mingw/lib/stdlib.a src/utils/cdk/gdstubs.o src/networks/direct_connect/che3_c.o src/utils/lib/CryptoPP.o src/utils/lib/CryptoPP_stubs.o src/utils/net/upnp_stubs.o src/daemon/common/commonHasher_c.o src/utils/lib/magiclib_stub.o src/utils/bitstring/bitstring_c.o src/utils/cdk/zlibstubs.o src/utils/cdk/heap_c.o src/config/mingw/os_stubs_c.o src/utils/lib/fst_hash.o src/utils/lib/md4_comp.o src/utils/lib/md4_c.o src/utils/lib/charsetstubs.o src/utils/lib/md5_c.o src/utils/lib/sha1_c.o src/utils/lib/tiger.o src/utils/lib/stubs_c.o -lnums -lcamlstr -lunix -lbigarray -lgdi32 -luser32 -ladvapi32 -limm32 -lshell32 -lole32 resfile.o -lpthread -lmagic -lgd -ljpeg -lfreetype -lpng -lz -lbz2 -lws2_32 -lshlwapi /mingw/lib/libasmrun.a /mingw/lib/libcharset.dll.a /mingw/lib/libiconv.dll.a

Optonally, compress the executable with upx.
```
upx --best --strip-relocs=0 mlnet.exe
```