[Bug c++/89405] New: [8/9 Regression] ICE in import_export_decl, at cp/decl2.c:2959

[gscfq@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89405

            Bug ID: 89405
           Summary: [8/9 Regression] ICE in import_export_decl, at
                    cp/decl2.c:2959
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

The combination "-std=c++17 -fno-weak" affects several testsuite cases.
Changed between 20180527 and 20180610.


$ cat z1.cc
#include <new>
int* f (void* a)
{
  return new(a) int();
}


$ g++-9-20190217 -c z1.cc -std=c++14
$ g++-9-20190217 -c z1.cc -std=c++14 -fno-weak
$ g++-9-20190217 -c z1.cc -std=c++17
$
$ g++-7          -c z1.cc -std=c++17 -fno-weak
$ g++-9-20180527 -c z1.cc -std=c++17 -fno-weak


$ g++-9-20190217 -c z1.cc -std=c++17 -fno-weak
z1.cc:5:1: internal compiler error: in import_export_decl, at cp/decl2.c:2959
    5 | }
      | ^
0x65c5cb import_export_decl(tree_node*)
        ../../gcc/cp/decl2.c:2959
0x65fc67 c_parse_final_cleanups()
        ../../gcc/cp/decl2.c:4987