[Bug c/86376] New: recent breakage in ubsan build ?

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86376

            Bug ID: 86376
           Summary: recent breakage in ubsan build ?
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Doing a ubsan build with revision 261981 worked. 

Doing same with revision 262304 doesn't. It breaks at
the compare of stage 2 and stage 3.

Configure line is

../trunk/configure --prefix=/home/dcb/gcc/results.262304.ubsan \
        --with-build-config=bootstrap-ubsan \
        --disable-multilib \
        --disable-werror \
        --enable-checking=df,extra,fold,rtl,yes \
        --enable-languages=c,c++,fortran