progress on XMPP for windows, but not linking yet

doc/todo/windows_support.mdwn

@@ -8,32 +8,7 @@ now! --[[Joey]]
   or perhaps easier,
   <http://hackage.haskell.org/package/Win32-services-wrapper>
 
-* XMPP library not yet built.
+* XMPP library not yet built. (See below.)
-  
-  This should work to install the deps, using libs from cygwin
-
-<pre>
-cabal install libxml-sax --extra-lib-dirs=C:\\cygwin\\lib --extra-include-dirs=C:\\cygwin\\usr\\include\\libxml2
-cabal install gnuidn --extra-lib-dirs=C:\\cygwin\\lib --extra-include-dirs=C:\\cygwin\\usr\\include\\
-cabal install gnutls --extra-lib-dirs=C:\\cygwin\\lib --extra-include-dirs=C:\\cygwin\\usr\\include\\
-</pre>
-
-  While the 1st line works, the rest fail oddly. Looks like lack of
-  quoting when cabal runs c2hs. This can be worked around by
-  unpacking the tarball, manually running c2hs, and deleting the .chs
-  files. 
-  
-  However, then it fails:
-
-<pre>
-Building gnuidn-0.2.1...
-Preprocessing library gnuidn-0.2.1...
-[1 of 4] Compiling Data.Text.IDN.Internal ( lib\Data\Text\IDN\Internal.hs, dist\build\Data\Text\IDN\Internal.o )
-C:/Program Files/Haskell Platform/2013.2.0.0/mingw/bin/../lib/libmingw32.a(main.o):main.c:(.text+0xd2): undefined reference to `WinMain@16'
-</pre>
-
-  Also needs gsasl, which is not in cygwin. 
-  See <http://josefsson.org/gsasl4win/README.html>
 
 * View debug log is empty in windows -- all logs go to console.
   This messes up a few parts of UI that direct user to the debug log.
@@ -71,3 +46,59 @@ C:/Program Files/Haskell Platform/2013.2.0.0/mingw/bin/../lib/libmingw32.a(main.
 * test that adding a repo on a removable drive works; that git is synced to
   it and files can be transferred to it and back
 * Does stopping in progress transfers work in the webapp?
+
+## trying to build XMPP
+
+  Trying to install the deps, using libs from cygwin. Cabal can be used
+  with some hacking:
+
+	cabal unpack libxml-sax
+	cd libxml-sax-*
+	cabal configure --extra-lib-dirs=C:\\cygwin\\lib --extra-include-dirs=C:\\cygwin\\usr\\include\\libxml2
+	cabal build || true
+	cabal copy
+	cabal register
+	
+	cabal unpack gnutls
+	cd gnutls-*
+	cabal configure --extra-lib-dirs=C:\\cygwin\\lib --extra-include-dirs=C:\\cygwin\\usr\\include\\
+	cabal build || true
+	cabal copy
+	cabal register
+
+	# get mingw x86 gasal zip from <ftp://alpha.gnu.org/gnu/gsasl/> and unpack
+	# into the Haskell platform's mingw directory.
+	cabal unpack gsasl
+	cd gsasl-*
+	cabal configure --extra-lib-dirs=C:\\cygwin\\lib --extra-include-dirs=C:\\cygwin\\usr\\include\\
+	cabal build || true
+	cabal copy
+	cabal register --gen-pkg-config
+	grep -v /home/jas gsasl*.conf > hacked.conf
+	ghc-pkg update hacked.conf --global --user --force
+
+  Cannot get haskell gnuidn binding to link. Workaround: It's not hard to hack
+  network-client-xmpp to not use gnuidn.
+
+  dlls don't get found when building git-annex,
+  at TH link time. Worked around by copying /usr/bin/cyggnutls-28.dll to
+  ./gnutls.dll, and the same for several others. Note that gsasl has
+  to be copied from where it was installed in ming2/bin/libgsasl-7.dll
+  to gsasl.dll (the libgsasl.dll from cygwin won't work).
+
+	Loading package gnutls-0.1.5 ... linking ... done.
+	Loading package gsasl-0.3.5 ... linking ... ghc.exe: unable to load package `gsasl-0.3.5'
+	ghc.exe: C:\Documents and Settings\me\Application Data\cabal\gsasl-0.3.5\ghc-7.6.3\HSgsasl-0.3.5.o: unknown symbol `_gsasl_client_start'
+
+  Current problem:
+
+	GHCi runtime linker: fatal error: I found a duplicate definition for symbol
+	   _adler32
+	whilst processing object file
+	   C:\cygwin\lib\libz.a
+
+  I think this means I can't use the cygwin libs, and need to get mingw
+  builds of gnutls and libxml2 instead. 
+  
+  TODO: Try <http://josefsson.org/gnutls4win/>, and libxml2 from mingw,
+  and pkg-config from <http://www.gtk.org/download/win32.php>.