When I compile qt-x11-free-3.3.3 with the actual snapshot using the options: -O3 --param max-gcse-passes=4 -floop-optimize2 -fmove-loop-invariants I get get a miscompilation in the file sql_lex.cc in a very complex switch statement which results in an error during linking: "undefined reference to .L968"
This error goes away when I ommit -floop-optimize2 -fmove-loop-invariants or use -O2 or max-gcse-passes=3 Since the source to produce this error is too large (~ 100 .o files and 38 libraries are linking together) I did not file a bug report. Maybe the combination of parameters doesn't make sense or is invalid, but my goal was to stress the compiler by using parameters which might produce better code. (We have c++ programs where max-gcse-passes=5 is necessary to get fast code) My question are: Is this a valid combination of parameters and should that combination work? Should I submit this as a bug report? Michael Cieslinski output gcc -v: Reading specs from /usr/local/gcc40a/lib/gcc/powerpc-unknown-linux-gnu/4.0.0/specs Configured with: ../gcc40/configure --prefix=/usr/local/gcc40a --program-suffix=40a --with-cpu=G5 --enable-altivec --enable-languages=c,c++ --enable-checking Thread model: posix gcc version 4.0.0 20041121 (experimental) The source can be downloaded at: http://www.trolltech.com/download/qt/x11.html to compile I use CFLAGS and CXXFLAGS: -pipe -g -O3 -mcpu=G5 -maltivec -mabi=altivec -fmessage-length=0 -falign-loops=16 -falign-jumps=16 -falign-functions=32 -fstrict-aliasing -fsched-interblock --param max-gcse-passes=5 -ffast-math -funroll-all-loops -funit-at-a-time -fpeel-loops -ftracer -funswitch-loops -floop-optimize2 -fmove-loop-invariants -fgcse-after-reload -frename-registers QT was configured with: ./configure --prefix=/home/cie019/mysql/mysql --enable-thread-safe-client -- Summary: miscompilation of complex switch statement Product: gcc Version: 4.0.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: tree-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: micis at gmx dot de CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: powerpc-unknown-linux-gnu GCC host triplet: powerpc-unknown-linux-gnu GCC target triplet: powerpc-unknown-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18628
