https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81318
--- Comment #33 from Daniel Black <daniel at linux dot vnet.ibm.com> --- Works for me. $ toolchain/bin/gcc -O1 -Wno-attributes -Wno-implicit-int -c /tmp/x.c $ toolchain/bin/gcc --version gcc (GCC) 8.0.0 20171024 (experimental) Thanks Markus, Martin, Honza.