Probably introduced by the fix for bug 44385, given it happens in the same place and removing -fuse-linker-plugin "fixes" it again: With gcc 4.5.1 rev 160157, linking Qt's moc with -flto -fuse-linker-plugin results in
g++ -Wl,-rpath-link,/usr/src/ark/BUILD/qt/lib -m64 -O2 -fomit-frame-pointer -fweb -frename-registers -Wl,-O2,-z,combreloc,-z,relro,--enable-new-dtags,--hash-style=gnu -g -flto -fuse-linker-plugin -Wl,-rpath,/usr/lib64/qt4-embedded/lib -Wl,-rpath,/usr/lib64/qt4-embedded/lib -flto -fuse-linker-plugin -fwhole-program -o ../../../bin/moc release-static/moc.o release-static/preprocessor.o release-static/generator.o release-static/parser.o release-static/token.o release-static/main.o -L/usr/src/ark/BUILD/qt/src/tools/bootstrap -lbootstrap -lz lto1: internal compiler error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. lto-wrapper: g++ returned 1 exit status /usr/bin/ld: fatal error: lto-wrapper failed collect2: ld returned 1 exit status I couldn't get gdb to produce relevant output for this, so I'm attaching what ltrace -f has to say just before the crash. -- Summary: lto1: internal compiler error: Segmentation fault Product: gcc Version: 4.5.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: lto AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: bero at arklinux dot org GCC build triplet: x86_64-unknown-linux-gnu GCC host triplet: x86_64-unknown-linux-gnu GCC target triplet: x86_64-unknown-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44398
