program doesn't work with -O2

[Antonio Coralles <noche dot suapie at reflex dot at>]

I'm writing on a c++ program which I recently switched from hand written 
makefiles to the gnu autotools. This was not that easy as I had 
expected,  as the program is about 25 000 lines. Finally it works, but 
only when compiled completly without optimazation. When I try for example
make clean; make CXXFLAGS="-O2" I get hundreds of messages like this one 
from the linker:

/usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.5/../../../../i686-pc-linux-gnu/bin/ld: 
`.gnu.linkonce.t._ZN5boost9date_time23gregorian_calendar_baseINS0_19year_month_day_baseINS_9gregorian9greg_yearENS3_10greg_monthENS3_8greg_dayEEEmE16end_of_month_dayES4_S5_' 
referenced in section `.rodata' of 
interface/shiftTable/lib_shifttable.a(lib_shifttable_a-dateFields.o): 
defined in discarded section 
`.gnu.linkonce.t._ZN5boost9date_time23gregorian_calendar_baseINS0_19year_month_day_baseINS_9gregorian9greg_yearENS3_10greg_monthENS3_8greg_dayEEEmE16end_of_month_dayES4_S5_' 
of interface/shiftTable/lib_shifttable.a(lib_shifttable_a-dateFields.o)

This messages don't appear when I compile without optimisation. Besides 
the resulting exectutable is more or less useless because it contains 
the strange bugs - bugs which are not there when compiled for example 
with CXXFLAGS="".

Maybe someone can give me a hint what I'm doing wrong.

Here is some additional information, which may or may not be usefull:

I'm using gcc-3.3.5.

I'm using the following libraries:
1.)boost::smart_ptr - from boost-1.32.0
2.)boost::spirit - from boost-1.32.0
3.)boost::date_time - from boost-1.32.0
4.)sqlite-2.8.15
5.)gtkmm-2.4.8

My program is organized into subdirectories. A typical Makefile.am for a 
sub-dir looks like this:

#################################################################################
noinst_LIBRARIES = lib_shifttable.a

lib_shifttable_a_SOURCES = \
   tableField.hpp tableField.cc \
   textField.hpp textField.cc \
   coloredTextField.hpp coloredTextField.cc \
   workerScheduleField.hpp workerScheduleField.cc \
   poolScheduleField.hpp poolScheduleField.cc \
   statFields.hpp statFields.cc \
   dateFields.hpp dateFields.cc \
   shiftTable.hpp shiftTable.cc \
   shiftTableBox.hpp shiftTableBox.cc \
   monthBox.hpp monthBox.cc
  
lib_shifttable_a_CXXFLAGS = $(GTKMM_CFLAGS)
################################################################################

Linkage is done through the following command:
*g++  -O2   -o dpm  dpm-main.o dataStorage/lib_datastorage.a 
utility/lib_utils.a organizer/lib_organizer.a manpower/lib_manpower.a 
labourLaw/lib_labourlaw.a schedule/lib_schedule.a 
helperFunctions/lib_helperfunctions.a shared/lib_shared.a  
interface/mainWindow/lib_mainwindow.a interface/listView/lib_listview.a 
interface/attributeWindow/lib_attributewindow.a 
interface/shiftTable/lib_shifttable.a interface/misc/lib_misc.a 
htmlExport/lib_htmlexport.a messageMem/lib_messagemem.a -lsqlite 
-L/usr/lib -lboost_date_time -Wl,--export-dynamic -lgtkmm-2.4 
-lgdkmm-2.4 -latkmm-1.6 -lgtk-x11-2.0 -lpangomm-1.4 -lglibmm-2.4 
-lsigc-2.0 -lgdk-x11-2.0 -latk-1.0 -lgdk_pixbuf-2.0 -lm -lpangoxft-1.0 
-lpangox-1.0 -lpango-1.0 -lgobject-2.0 -lgmodule-2.0 -ldl -lglib-2.0

thanks,
            antonio
*