1. Building from PyCool/dict executes two commands:

export PYTHONPATH="M:\external\Boost\1.32.0_python242\win32_vc71\lib\python2.4\site-packages;M:\app\releases\SEAL\SEAL_1_7_9\win32_vc71_dbg\lib;M:\app\releases\SEAL\SEAL_1_7_9\win32_vc71_dbg\python;M:\external\root\5.08.00\win32_vc71\root\bin;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\bin;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\lib;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\python;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\bin;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\lib;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\python"; 

wine /afs/cern.ch/sw/lcg/external/Python/2.4.2/win32_vc71/python.exe M:\\app\\releases\\SEAL\\SEAL_1_7_9\\win32_vc71_dbg\\bin\\lcgdict.py M:\\app\\releases\\COOL\\internal\\avalassi\\COOL_HEAD\\src\\PyCool\\dict\\PyCool_headers.h -s M:\\app\\releases\\COOL\\internal\\avalassi\\COOL_HEAD\\src\\PyCool\\dict\\PyCool_selection.xml -o M:\\app\\releases\\COOL\\internal\\avalassi\\COOL_HEAD\\tmp\\win32_vc71_dbg_wine\\src\\PyCool\\dict\\PyCool_headers_dict.cpp --split --reflex --gccxmlpath=M:\\external\\gccxml\\0.6.0_patch3\\win32_vc71\\bin 

-I/afs/cern.ch/sw/lcg/app/releases/COOL/internal/avalassi/COOL_HEAD/src/PyCool -I/afs/cern.ch/sw/lcg/app/releases/COOL/internal/avalassi/COOL_HEAD/src/CoolApplication -I/afs/cern.ch/sw/lcg/app/releases/COOL/internal/avalassi/COOL_HEAD/src/CoolKernel -I/afs/cern.ch/sw/lcg/app/releases/SEAL/SEAL_1_7_9/src/Foundation/SealBase -I/win32_vc71_dbg_wine/include -I/afs/cern.ch/sw/lcg/app/releases/SEAL/SEAL_1_7_9/src/Foundation/SealPlatform -I/afs/cern.ch/sw/lcg/app/releases/CORAL/CORAL_1_2_1/src/CoralBase -I/afs/cern.ch/sw/lcg/app/releases/SEAL/SEAL_1_7_9/src/Framework/SealKernel -I/afs/cern.ch/sw/lcg/app/releases/SEAL/SEAL_1_7_9/src/Foundation/PluginManager -I/afs/cern.ch/sw/lcg/app/releases/POOL/POOL_2_2_7/src/AttributeList -I/afs/cern.ch/sw/lcg/app/releases/POOL/POOL_2_2_7/src/POOLCore -I/afs/cern.ch/sw/lcg/app/releases/SEAL/SEAL_1_7_9/src/Dictionary/Reflection -I/afs/cern.ch/sw/lcg/app/releases/SEAL/SEAL_1_7_9/src/Framework/SealServices -I/afs/cern.ch/sw/lcg/app/releases/SEAL/SEAL_1_7_9/src/Dictionary/Reflex -I/afs/cern.ch/sw/lcg/external/uuid/1.38/win32_vc71/include -I/afs/cern.ch/sw/lcg/external/Boost/1.32.0_python242/win32_vc71/include/boost-1_32 -I/afs/cern.ch/sw/lcg/external/Python/2.4.2/win32_vc71/include -I/afs/cern.ch/sw/lcg/external/pcre/4.4/win32_vc71/include -I/afs/cern.ch/sw/lcg/app/releases/SEAL/SEAL_1_7_9/src -I/afs/cern.ch/sw/lcg/app/releases/SEAL/SEAL_1_7_9/win32_vc71_dbg/include -I/afs/cern.ch/sw/lcg/app/releases/POOL/POOL_2_2_7/src -I/afs/cern.ch/sw/lcg/app/releases/CORAL/CORAL_1_2_1/src -I/opt/avalassi/wine/win32/dosdevices/c:/Program Files/Microsoft Visual Studio .NET 2003/Vc7/include -I/opt/avalassi/wine/win32/dosdevices/c:/Program Files/Microsoft Visual Studio .NET 2003/Vc7/PlatformSDK/Include -D_GNU_SOURCE -DGNU_SOURCE -DWIN32 -D_MBCS -D_WINDOWS -DSEAL_KERNEL_BUILD_ARCHIVE -D_DEBUG -DLCGDICT_STRING

where in the second case I separated the command from the long include path.

2. Build by hand a simplified test case 

Just execute two commands (export and wine)... 
but first you must be in bash and create a directory tmp.

bash

export PYTHONPATH="M:\external\Boost\1.32.0_python242\win32_vc71\lib\python2.4\site-packages;M:\app\releases\SEAL\SEAL_1_7_9\win32_vc71_dbg\lib;M:\app\releases\SEAL\SEAL_1_7_9\win32_vc71_dbg\python;M:\external\root\5.08.00\win32_vc71\root\bin;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\bin;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\lib;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\python;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\bin;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\lib;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\python"; 

\rm -rf tmp
mkdir -p tmp

wine /afs/cern.ch/sw/lcg/external/Python/2.4.2/win32_vc71/python.exe M:\\app\\releases\\SEAL\\SEAL_1_7_9\\win32_vc71_dbg\\bin\\lcgdict.py wineTest.h -s wineTest.xml -o tmp/wineTest_dict.cpp --split --reflex --gccxmlpath=M:\\external\\gccxml\\0.6.0_patch3\\win32_vc71\\bin

This hangs on "Parsing file wineTest.h with GCC_XML".
From another window,
  ps -xfa | more
reveals the two processes that are stuck:

18451 pts/4    S      0:00              \_ /opt/avalassi/wine/wine-20050930-install/bin/wine-preloader /opt/avalassi/wine/wine-20050930-install/bin/wine-pthread c:\windows\system32\wcmd.exe /c M:\external\gccxml\0.6.0_patch3\win32_vc71\bin\gccxml wineTest.h -fxml=tmp\wineTest.xml -D__REFLEX__

18452 pts/4    S      0:12                  \_ /opt/avalassi/wine/wine-20050930-install/bin/wine-preloader /opt/avalassi/wine/wine-20050930-install/bin/wine-pthread M:\external\gccxml\0.6.0_patch3\win32_vc71\bin\gccxml wineTest.h -fxml=tmp\wineTest.xml -D__REFLEX__

These are the two typical processes that must be killed to complete the build.

3. Execute gccxml from wine directly

bash

export PYTHONPATH="M:\external\Boost\1.32.0_python242\win32_vc71\lib\python2.4\site-packages;M:\app\releases\SEAL\SEAL_1_7_9\win32_vc71_dbg\lib;M:\app\releases\SEAL\SEAL_1_7_9\win32_vc71_dbg\python;M:\external\root\5.08.00\win32_vc71\root\bin;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\bin;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\lib;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\python;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\bin;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\lib;M:\app\releases\COOL\internal\avalassi\COOL_HEAD\win32_vc71_dbg_wine\python"; 

\rm -rf tmp
mkdir -p tmp

wine /afs/cern.ch/sw/lcg/external/gccxml/0.6.0_patch3/win32_vc71/bin/gccxml wineTest.h -fxml=tmp/wineTest.xml -D__REFLEX__

This hangs, indeed. It is the simplest example that hangs.

Note that wineTest.xml here is the output of gccxml, not the input 
to Reflex (and in fact it is in a different temporary directory!)

4. Recipe to kill the processes from another window

a. Wait for "Parsing file" on the build window

b. On the second window, type
   ps -xfa | grep gccxml | grep -v grep
Wait until there are only two processes 
(i.e. until gccxml_cc1plus has finished)

c. On the second window, kill the two processes using
   kill `ps -xfa | grep gccxml | grep -v grep | awk '{print $1}'`

PS Another possibility could be to replace gccxml by gccxml_cc1plus
with the correct settings, but these are too long to be all displayed.
You can get a hint at them by typing
  wine /afs/cern.ch/sw/lcg/external/gccxml/0.6.0_patch3/win32_vc71/bin/gccxml --print
Also, it is difficult to pass to wine some options with a lot of ().