http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53226
--- Comment #6 from Mario Baumann <mario-baumann at web dot de> 2012-05-08 07:54:22 UTC --- Created attachment 27341 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27341 c++ source Added testcase (needs include files from boost -> http://sourceforge.net/projects/boost/files/boost/1.49.0/ -> just extract any tarball). > /app2/gcc/4.8.0-20120507-svn187053/x86_64/bin/g++ -v Using built-in specs. COLLECT_GCC=/app2/gcc/4.8.0-20120507-svn187053/x86_64/bin/g++ COLLECT_LTO_WRAPPER=/app2/gcc/4.8.0-20120507-svn187053/x86_64/libexec/gcc/x86_64-unknown-linux-gnu/4.8.0/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: ./configure --prefix=/app2/gcc/4.8.0-20120507-svn187053/x86_64 --enable-languages=c,c++,fortran --disable-nls --with-gmp=/app2/gcc/4.8.0-20120507-svn187053/x86_64/aux --with-mpfr=/app2/gcc/4.8.0-20120507-svn187053/x86_64/aux --with-mpc=/app2/gcc/4.8.0-20120507-svn187053/x86_64/aux --with-ppl=/app2/gcc/4.8.0-20120507-svn187053/x86_64/aux --with-cloog=/app2/gcc/4.8.0-20120507-svn187053/x86_64/aux Thread model: posix gcc version 4.8.0 20120502 (experimental) (GCC) bad: g++ -Iboost_1_49_0/ -c foo.cpp -O2 -m64 bad: g++ -Iboost_1_49_0/ -c foo.cpp -O1 -m64 ok: g++ -Iboost_1_49_0/ -c foo.cpp -O0 -m64 ok: g++ -Iboost_1_49_0/ -c foo.cpp -O2 -m32 Mario.