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