[Bug lto/65475] [5 Regression] ICE in odr_vtable_hasher::equal (Segmentation fault)

["marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65475

--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Unfortunately, there is another problem with applied patch:

$ cat 1.ii
namespace std {
class exception {};
class runtime_error : exception {
  virtual char m_fn1();
} a;
}

$ cat 2.ii
namespace std {
class exception {
  virtual char m_fn1();
};
class runtime_error : exception {
} a;
}

$ g++ 1.ii 2.ii -flto -O1
/home/marxin/Programming/bin/gcc/bin/ld: error: /tmp/cc7v39VO.o: multiple
definition of 'std::a'
/home/marxin/Programming/bin/gcc/bin/ld: /tmp/ccJ8pPM4.o: previous definition
here
2.ii:2:7: warning: type ‘struct exception’ violates one definition rule [-Wodr]
 class exception {
       ^
1.ii:2:7: note: a type with different virtual table pointers is defined in
another translation unit
 class exception {};
       ^
2.ii:2:7: warning: type ‘struct exception’ violates one definition rule [-Wodr]
 class exception {
       ^
1.ii:2:7: note: a type with different bases is defined in another translation
unit
 class exception {};
       ^
1.ii:3:7: warning: type ‘struct runtime_error’ violates one definition rule
[-Wodr]
 class runtime_error : exception {
       ^
2.ii:5:7: note: a type with different virtual table pointers is defined in
another translation unit
 class runtime_error : exception {
       ^
lto1: internal compiler error: in add_type_duplicate, at ipa-devirt.c:1575
0x77c43c add_type_duplicate
    ../../gcc/ipa-devirt.c:1573
0x77c43c get_odr_type(tree_node*, bool)
    ../../gcc/ipa-devirt.c:1772
0x77d25c register_odr_type(tree_node*)
    ../../gcc/ipa-devirt.c:1848
0x5b43d6 lto_read_decls
    ../../gcc/lto/lto.c:1946
0x5b4d7b lto_file_finalize
    ../../gcc/lto/lto.c:2236
0x5b4d7b lto_create_files_from_ids
    ../../gcc/lto/lto.c:2246
0x5b4d7b lto_file_read
    ../../gcc/lto/lto.c:2287
0x5b4d7b read_cgraph_and_symbols
    ../../gcc/lto/lto.c:2992
0x5b4d7b lto_main()
    ../../gcc/lto/lto.c:3462


Thanks,
Martin
>From gcc-bugs-return-480931-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Mar 20 09:58:51 2015
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/65486] ICE: in type_natural_mode, at config/i386/i386.c:6646
Date: Fri, 20 Mar 2015 10:11:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide486

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Note long double vectors are never beneficial, there is no HW support for them,
so while the testcase is valid, using it is always a bad idea.