[Bug bootstrap/83015] New: [8 regression] bootstrap comparison failure on ia64

[schwab@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83015

            Bug ID: 83015
           Summary: [8 regression] bootstrap comparison failure on ia64
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: schwab@linux-m68k.org
                CC: hubicka at ucw dot cz
  Target Milestone: ---
            Target: ia64-*-*

ia64 fails to bootstrap since r254636.

Comparing stages 2 and 3
warning: gcc/cc1objplus-checksum.o differs
warning: gcc/cc1obj-checksum.o differs
Bootstrap comparison failure!
gcc/ipa-icf.o differs
gcc/tree-sra.o differs
gcc/cp/name-lookup.o differs
gcc/cp/tree.o differs
gcc/cp/pt.o differs
gcc/cp/constexpr.o differs
gcc/cp/cp-gimplify.o differs
gcc/cp/cxx-pretty-print.o differs
gcc/cp/cp-objcp-common.o differs
gcc/cp/parser.o differs
gcc/var-tracking.o differs
gcc/tree-vect-generic.o differs
gcc/tree-vect-stmts.o differs
gcc/go/expressions.o differs
gcc/go/statements.o differs
gcc/go/types.o differs
gcc/cfgbuild.o differs
gcc/tree-chkp.o differs
gcc/function.o differs
gcc/tree-ssa-sccvn.o differs
gcc/fold-const.o differs
gcc/emit-rtl.o differs
gcc/tree-ssa-uninit.o differs
gcc/lto/lto.o differs
gcc/tree-vrp.o differs
gcc/ipa-fnsummary.o differs
gcc/tree.o differs
gcc/tree-data-ref.o differs
gcc/fibonacci_heap.o differs
gcc/tree-into-ssa.o differs
gcc/gcov.o differs
gcc/tree-ssa-loop-im.o differs
gcc/varasm.o differs
gcc/tree-eh.o differs
gcc/builtins.o differs
gcc/tree-vect-slp.o differs
gcc/tree-ssa-reassoc.o differs
gcc/tree-switch-conversion.o differs
gcc/c/c-parser.o differs
gcc/objcp/objc-next-runtime-abi-02.o differs
gcc/loop-unroll.o differs
gcc/tree-inline.o differs
gcc/tree-cfg.o differs
gcc/omp-low.o differs
gcc/tree-if-conv.o differs
gcc/dse.o differs
gcc/trans-mem.o differs
gcc/except.o differs
gcc/cfgexpand.o differs
gcc/tree-vect-patterns.o differs
gcc/hsa-gen.o differs
gcc/gimple-fold.o differs
gcc/tree-nested.o differs
gcc/ipa-cp.o differs
gcc/simplify-rtx.o differs
gcc/ipa-devirt.o differs
gcc/tree-vect-loop.o differs
gcc/graphite-isl-ast-to-gimple.o differs
gcc/objc/objc-next-runtime-abi-02.o differs
gcc/tree-vect-data-refs.o differs
gcc/gimple-match.o differs
gcc/tree-ssa-loop-prefetch.o differs
gcc/ipa-prop.o differs
gcc/tree-tailcall.o differs
gcc/passes.o differs
gcc/multiple_target.o differs
gcc/predict.o differs
gcc/dwarf2out.o differs
gcc/tree-ssa-loop-niter.o differs

$ diff -u <(nm stage{2,3}-gcc/tree-ssa.o)
--- /dev/fd/63  2017-11-12 12:13:17.607494656 +0100
+++ /dev/fd/62  2017-11-12 12:13:17.607494656 +0100
@@ -131,9 +131,9 @@
 00000000000003b0 t _ZL15gimple_call_argPK6gimplej.part.69
 00000000000009c0 t _ZL15verify_ssa_nameP9tree_nodeb
 00000000000004d0 t _ZL16op_iter_init_defP11ssa_op_iterP6gimplei.part.76
-0000000000001ec0 t _ZL16op_iter_next_defP11ssa_op_iter
+0000000000001a80 t _ZL16op_iter_next_defP11ssa_op_iter
 00000000000005e0 t _ZL17gimple_assign_lhsPK6gimple.part.85
-0000000000001a80 t _ZL17op_iter_next_treeP11ssa_op_iter
+0000000000001e40 t _ZL17op_iter_next_treeP11ssa_op_iter
 0000000000000470 t
_ZL18first_imm_use_stmtP16imm_use_iteratorP9tree_node.part.75
 0000000000000580 t _ZL18gimple_assign_rhs1PK6gimple.part.83
 0000000000000ec0 t _ZL18maybe_optimize_varP9tree_nodeP11bitmap_headS2_S2_