https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91236
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> --- It must be a miscompilation of gcc/tree-ssa-sccvn.c file. Using stage 2 compiler during boostrap is fine. Likewise, adding -O0 to gcc/tree-ssa-sccvn.c is fine. I'm using following host compiler: $ gcc --version gcc (SUSE Linux) 7.4.0