http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60887
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
I got
/export/project/git/gcc-regression-bootstrap/master/209484/bld/./prev-gcc/xg++
-B/export/project/git/gcc-regression-bootstrap/master/209484/bld/./prev-gcc/
-B/usr/local/x86_64-unknown-linux-gnu/bin/ -nostdinc++
-B/export/project/git/gcc-regression-bootstrap/master/209484/bld/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-B/export/project/git/gcc-regression-bootstrap/master/209484/bld/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-I/export/project/git/gcc-regression-bootstrap/master/209484/bld/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include/x86_64-unknown-linux-gnu
-I/export/project/git/gcc-regression-bootstrap/master/209484/bld/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include
-I/export/project/git/gcc-regression/gcc/libstdc++-v3/libsupc++
-L/export/project/git/gcc-regression-bootstrap/master/209484/bld/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-L/export/project/git/gcc-regression-bootstrap/master/209484/bld/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-g -O2 -flto=jobserver -frandom-seed=1 -ffat-lto-objects -fprofile-use
-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 -fno-common -DHAVE_CONFIG_H -static-libstdc++
-static-libgcc -o lto1 \
lto/lto-lang.o lto/lto.o lto/lto-object.o attribs.o lto/lto-partition.o
lto/lto-symtab.o libbackend.a main.o tree-browser.o libcommon-target.a
libcommon.a ../libcpp/libcpp.a ../libdecnumber/libdecnumber.a -lmpc -lmpfr
-lgmp -rdynamic -ldl -lz libcommon.a ../libcpp/libcpp.a
../libbacktrace/.libs/libbacktrace.a ../libiberty/libiberty.a
../libdecnumber/libdecnumber.a
/tmp/ccR2WYVX.ltrans4.ltrans.o:(.debug_info+0x988e2): undefined reference to
`.L958'
collect2: error: ld returned 1 exit status
make[3]: *** [lto1] Error 1
