https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61886
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fails LTO bootstrap with
/abuild/rguenther/obj/./prev-gcc/xg++ -B/abuild/rguenther/obj/./prev-gcc/
-B/usr/local/x86_64-unknown-linux-gnu/bin/ -nostdinc++
-B/abuild/rguenther/obj/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-B/abuild/rguenther/obj/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-I/abuild/rguenther/obj/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include/x86_64-unknown-linux-gnu
-I/abuild/rguenther/obj/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include
-I/space/rguenther/src/svn/trunk/libstdc++-v3/libsupc++
-L/abuild/rguenther/obj/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-L/abuild/rguenther/obj/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-g -O2 -flto=jobserver -frandom-seed=1 -ffat-lto-objects -DIN_GCC
-fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing
-Wwrite-strings -Wcast-qual -Wmissing-format-attribute -Woverloaded-virtual
-pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror
-fno-common -DHAVE_CONFIG_H -DGENERATOR_FILE -static-libstdc++ -static-libgcc
-o build/genhooks \
build/genhooks.o build/errors.o .././libiberty/libiberty.a
lto1: internal compiler error: in maybe_add_reference, at symtab.c:613
0x68a129 symtab_node::maybe_add_reference(tree_node*, ipa_ref_use,
gimple_statement_base*)
/space/rguenther/src/svn/trunk/gcc/symtab.c:613
0x6a16de cgraph_create_virtual_clone(cgraph_node*, vec<cgraph_edge*, va_heap,
vl_ptr>, vec<ipa_replace_map*, va_gc, vl_embed>*, bitmap_head*, char const*)
/space/rguenther/src/svn/trunk/gcc/cgraphclones.c:582
0x12ca0e5 create_specialized_node
/space/rguenther/src/svn/trunk/gcc/ipa-cp.c:2802
0x12ce757 decide_whether_version_node
/space/rguenther/src/svn/trunk/gcc/ipa-cp.c:3556
0x12ce8d3 ipcp_decision_stage
/space/rguenther/src/svn/trunk/gcc/ipa-cp.c:3668
0x12cef4d ipcp_driver
/space/rguenther/src/svn/trunk/gcc/ipa-cp.c:3714
0x12cefba execute
/space/rguenther/src/svn/trunk/gcc/ipa-cp.c:3805
