[Bug lto/65302] New: [5 Regression] LTO: ICE internal compiler error: verify_flow_info failed

[burnus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65302

            Bug ID: 65302
           Summary: [5 Regression] LTO: ICE internal compiler error:
                    verify_flow_info failed
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org
                CC: hubicka at gcc dot gnu.org

Created attachment 34938
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34938&action=edit
one.ii

Follow up to PR65276. The following code fails with an ICE. The ICE is gone if
one removes the "-O0" from the LTO stage:

  g++ -c -flto -O2 one.ii two.ii
  gcc -r -nostdlib -O0 one.o two.o

fails with

one.ii: In member function ‘Init’:
one.ii:93:6: error: BB 5 can not throw but has an EH edge
 void ZRubberBand2P::Init () {
      ^
one.ii:93:6: internal compiler error: verify_flow_info failed
0x690a8b verify_flow_info()
        ../../gcc/cfghooks.c:280


Both PR65276 and this PR are for the same big code; I fear that neither the
fixed PR65276 nor this PR are fully representative for the big code as the
latter should be compiled with some "-O" while the two PRs involve -O0. Thus,
expect another follow-up PR once this PR is fixed. The compilation of the big
program fails with an ICE in add_symbol_to_partition_1, at
lto/lto-partition.c:158.