[Bug bootstrap/80915] [8 Regression] bootstrap failed with LTO

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80915

--- Comment #3 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Works for me:
/data/users/nathans/trunk/obj/x86_64-lto/./prev-gcc/xg++
-B/data/users/nathans/trunk/obj/x86_64-lto/./prev-gcc/
-B/usr/local/x86_64-pc-linux-gnu/bin/ -nostdinc++
-B/data/users/nathans/trunk/obj/x86_64-lto/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-B/data/users/nathans/trunk/obj/x86_64-lto/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs

-I/data/users/nathans/trunk/obj/x86_64-lto/prev-x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu

-I/data/users/nathans/trunk/obj/x86_64-lto/prev-x86_64-pc-linux-gnu/libstdc++-v3/include
 -I/data/users/nathans/trunk/src/libstdc++-v3/libsupc++
-L/data/users/nathans/trunk/obj/x86_64-lto/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-L/data/users/nathans/trunk/obj/x86_64-lto/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs
-fno-PIE -c  -DIN_GCC_FRONTEND -g -O2 -flto=jobserver -frandom-seed=1 -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 -I. -Ic
-I/data/users/nathans/trunk/obj/x86_64-lto/../../src/gcc
-I/data/users/nathans/trunk/obj/x86_64-lto/../../src/gcc/c
-I/data/users/nathans/trunk/obj/x86_64-lto/../../src/gcc/../include
-I/data/users/nathans/trunk/obj/x86_64-lto/../../src/gcc/../libcpp/include 
-I/data/users/nathans/trunk/obj/x86_64-lto/../../src/gcc/../libdecnumber
-I/data/users/nathans/trunk/obj/x86_64-lto/../../src/gcc/../libdecnumber/bid
-I../libdecnumber
-I/data/users/nathans/trunk/obj/x86_64-lto/../../src/gcc/../libbacktrace   -o
c/c-array-notation.o -MT c/c-array-notation.o -MMD -MP -MF
c/.deps/c-array-notation.TPo
/data/users/nathans/trunk/obj/x86_64-lto/../../src/gcc/c/c-array-notation.c -g
-O2 -flto=jobserver

Please provide a self-contained testcase