Mainline bootstrap failure on i386-...

[Gerald Pfeifer]

..., specifically i386-unknown-freebsd4.7 for a simple
  ./configure --prefix ; make bootstrap-lean

case "compare-lean" in compare | compare-lean ) stage=2 ;; * ) stage=`echo compare-lean | sed -e 's,^compare\([0-9][0-9]*\).*,\1,'` ;; esac; \
if [ -f .bad_compare ]; then \
  echo "Bootstrap comparison failure!"; \
  cat .bad_compare; \
  exit 1; \
else \
  case "compare-lean" in \
    *-lean ) rm -rf stage$stage ;; \
    *) ;; \
  esac; true; \
fi
Bootstrap comparison failure!
gcse.o differs
insn-recog.o differs
cp/pt.o differs
gmake[1]: *** [compare-lean] Error 1
gmake[1]: Leaving directory `/files/pfeifer/OBJ-0216-2251/gcc'
gmake: *** [bootstrap-lean] Error 2

As far as I can tell, it depends on -O2 (and goes away with -O1).

This is the third regression (the other two still being "active") that
has been breaking my usual test builds in the last seven days. :-(

Gerald