[Bug c++/79557] New: ICE in ipa_modify_formal_parameters, at ipa-prop.c:3979

[gerhard.steinmetz.fortran@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79557

            Bug ID: 79557
           Summary: ICE in ipa_modify_formal_parameters, at
                    ipa-prop.c:3979
           Product: gcc
           Version: 7.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gerhard.steinmetz.fortran@t-online.de
  Target Milestone: ---

Version 7 applied to ./gcc/testsuite/g++.dg/cpp1z/inh-ctor28.C
(on x86_64 GNU/Linux) at -Os, -O2 or higher :


$ cat inh-ctor28.C
struct V { V(int); };
struct W : virtual V { using V::V; };
struct X : virtual W, virtual V { using W::W; };
X x(0);


$ gcc-7-20170212 -O2 -c inh-ctor28.C
inh-ctor28.C: In constructor 'W::W(int) [inherited from V]':
inh-ctor28.C:4:7: internal compiler error: in ipa_modify_formal_parameters, at
ipa-prop.c:3979
 X x(0);
       ^
0xc073ce ipa_modify_formal_parameters(tree_node*, vec<ipa_parm_adjustment,
va_heap, vl_ptr>)
        ../../gcc/ipa-prop.c:3979
0xed1b69 modify_function
        ../../gcc/tree-sra.c:5179
0xedbe96 ipa_early_sra
        ../../gcc/tree-sra.c:5410
0xedbe96 execute
        ../../gcc/tree-sra.c:5457