the attached code from the diffutils configure script is supposed to check for "working C stack overflow detection" but instead hangs when built with trunk at -O2 or higher. 4.4.2 works.
$ gcc -v Using built-in specs. COLLECT_GCC=/usr/x86_64-unknown-linux-gnu/gcc-bin/4.5.0-pre9999/gcc COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0-pre9999/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: /var/tmp/portage/sys-devel/gcc-4.5.0_pre9999/work/gcc-4.5.0-9999/configure --prefix=/usr --bindir=/usr/x86_64-unknown-linux-gnu/gcc-bin/4.5.0-pre9999 --includedir=/usr/lib/gcc/x86_64-unknown-linux-gnu/4.5.0-pre9999/include --datadir=/usr/share/gcc-data/x86_64-unknown-linux-gnu/4.5.0-pre9999 --mandir=/usr/share/gcc-data/x86_64-unknown-linux-gnu/4.5.0-pre9999/man --infodir=/usr/share/gcc-data/x86_64-unknown-linux-gnu/4.5.0-pre9999/info --with-gxx-include-dir=/usr/lib/gcc/x86_64-unknown-linux-gnu/4.5.0-pre9999/include/g++-v4 --host=x86_64-unknown-linux-gnu --build=x86_64-unknown-linux-gnu --disable-altivec --disable-fixed-point --with-ppl --with-cloog --disable-nls --with-system-zlib --disable-checking --disable-werror --enable-secureplt --enable-multilib --disable-libmudflap --disable-libssp --enable-libgomp --enable-cld --with-python-dir=/share/gcc-data/x86_64-unknown-linux-gnu/4.5.0-pre9999/python --disable-libgcj --enable-languages=c,c++ --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --with-bugurl=http://bugs.gentoo.org/ --with-pkgversion='Gentoo SVN' --enable-lto --enable-checking Thread model: posix gcc version 4.5.0-pre9999 20091215 (experimental) rev. 155245 (Gentoo SVN) -- Summary: trunk hangs during diffutils configure Product: gcc Version: 4.5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: other AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: dirtyepic at gentoo dot org GCC host triplet: x86_64-unknown-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42375
