The example attached is a simple data-container-class. The data is stored as Qt4-QStringLists. Everything was fine with gcc 4.1 (330KB). 4.2 already caused a significant increase. With 4.3, the binary size increased enormously again (6.7MB !).
When I disable GCSE-optimization using the additional flag "-fnogcse", I get normal binary sizes (360KB with 4.3.2). Command line use for compilation: g++ -c -pipe -O2 -march=i586 -mtune=i686 -fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/default -I. -I/usr/include/QtCore -I/usr/include/QtCore -I/usr/include/QtGui -I/usr/include/QtGui -I/usr/include -I. -Isrc -Isrc/linux -I. -I. -o SSMprotocol_def_en.o src/SSMprotocol_def_en.cpp => no errors or warnings GCC-info (Output of 'g++ -v'): Target: i586-suse-linux Configured with: ../configure --prefix=/usr --infodir=/usr/share/info --mandir=/usr/share/man --libdir=/usr/lib --libexecdir=/usr/lib --enable-languages=c,c++,objc,fortran,obj-c++,java,ada --enable-checking=release --with-gxx-include-dir=/usr/include/c++/4.3 --enable-ssp --disable-libssp --with-bugurl=http://bugs.opensuse.org/ --with-pkgversion='SUSE Linux' --disable-libgcj --disable-libmudflap --with-slibdir=/lib --with-system-zlib --enable-__cxa_atexit --enable-libstdcxx-allocator=new --disable-libstdcxx-pch --enable-version-specific-runtime-libs --program-suffix=-4.3 --enable-linux-futex --without-system-libunwind --with-cpu=generic --build=i586-suse-linux Thread model: posix gcc version 4.3.2 [gcc-4_3-branch revision 141291] (SUSE Linux) -- Summary: GCSE-optimization causes enormous binary size increase (~20 times !) Product: gcc Version: 4.3.2 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: comer352l at googlemail dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39077
