[Bug c++/31027] New: Compiler segfaults in simple virtual inheritance situation

[Bug c++/31027] New: Compiler segfaults in simple virtual inheritance situation

[v dot lesk at ic dot ac dot uk]

Compiler segfaults in simple virtual inheritance situation. If inheritance is
changed to non-virtual then code compiles correctly. Also code compiles
correctly if seemingly irrelevant bits of code are removed.

No headers are required for the code to trigger the bug and none are provided.


-- 
           Summary: Compiler segfaults in simple virtual inheritance
                    situation
           Product: gcc
           Version: 4.1.1
            Status: UNCONFIRMED
          Severity: blocker
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: v dot lesk at ic dot ac dot uk
 GCC build triplet: i586-mandriva-linux-gnu
  GCC host triplet: i586-mandriva-linux-gnu
GCC target triplet: i586-mandriva-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31027

[Bug c++/31027] Compiler segfaults in simple virtual inheritance situation

[v dot lesk at ic dot ac dot uk]

------- Comment #1 from v dot lesk at ic dot ac dot uk  2007-03-02 17:02 -------
//Couldnt include attachment so attaching (short) code here. See next comment
for compiler output.
class A
{
private:
protected:
public:
};

template<typename T>
class C:
  virtual public A
{
 private:
 protected:
 public:
  C();

  template<typename T_OTHER>C(const C<T_OTHER>&);

  C func(const class C<long>&)const;

  operator bool(void)const;
};

template<typename T>
C<T>::
C()
{
}

template<typename T>
template<typename T_OTHER>
C<T>::
C(const C<T_OTHER>&a)
{
}

template<typename T>
C<T>
C<T>::
func(const class C<long>&)const
{
  C<T>result;

  return result;
}

template<typename T>
class D:
  public C<T>
{
private:
protected:
public:
  void func2(void);
};


template<typename T>
void
D<T>::
func2(void)
{
  C<int>a;
  a.func(a);
}

void func3(void)
{
  C<int>a;
  a.func(a);
}

int
main(int argc,const char*const*argv)
{
  return 0;
}


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31027

[Bug c++/31027] Compiler segfaults in simple virtual inheritance situation

[v dot lesk at ic dot ac dot uk]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 2477 bytes --]



------- Comment #2 from v dot lesk at ic dot ac dot uk  2007-03-02 17:03 -------
Compiler command and output for this bug :
g++ -v -save-temps -c -O0 ./source.C
Using built-in specs.
Target: i586-mandriva-linux-gnu
Configured with: ../configure --prefix=/usr --libexecdir=/usr/lib
--with-slibdir=/lib --mandir=/usr/share/man --infodir=/usr/share/info
--enable-shared --enable-threads=posix --enable-checking=release
--enable-languages=c,c++,ada,fortran,objc,obj-c++,java
--host=i586-mandriva-linux-gnu --with-cpu=generic --with-system-zlib
--enable-long-long --enable-__cxa_atexit --enable-clocale=gnu
--disable-libunwind-exceptions --enable-java-awt=gtk
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --enable-gtk-cairo
--enable-ssp --disable-libssp
Thread model: posix
gcc version 4.1.1 20060724 (prerelease) (4.1.1-3mdk)
 /usr/lib/gcc/i586-mandriva-linux-gnu/4.1.1/cc1plus -E -quiet -v -D_GNU_SOURCE
./source.C -mtune=generic -O0 -fpch-preprocess -o source.ii
ignoring nonexistent directory "/bmm/home/vil/build/qt/include"
ignoring nonexistent directory
"/usr/lib/gcc/i586-mandriva-linux-gnu/4.1.1/../../../../i586-mandriva-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /bmm/home/vil/include
 /bmm/soft/Linux_2.4/include/
 /usr/lib/gcc/i586-mandriva-linux-gnu/4.1.1/../../../../include/c++/4.1.1

/usr/lib/gcc/i586-mandriva-linux-gnu/4.1.1/../../../../include/c++/4.1.1/i586-mandriva-linux-gnu

/usr/lib/gcc/i586-mandriva-linux-gnu/4.1.1/../../../../include/c++/4.1.1/backward
 /usr/local/include
 /usr/lib/gcc/i586-mandriva-linux-gnu/4.1.1/include
 /usr/include
End of search list.
 /usr/lib/gcc/i586-mandriva-linux-gnu/4.1.1/cc1plus -fpreprocessed source.ii
-quiet -dumpbase source.C -mtune=generic -auxbase source -O0 -version -o
source.s
GNU C++ version 4.1.1 20060724 (prerelease) (4.1.1-3mdk)
(i586-mandriva-linux-gnu)
        compiled by GNU C version 4.1.1 20060724 (prerelease) (4.1.1-3mdk).
GGC heuristics: --param ggc-min-expand=96 --param ggc-min-heapsize=125369
Compiler executable checksum: 60e98b6becb426227e419ae6a431d9b1
./source.C: In constructor ‘C<T>::C(const C<T_OTHER>&) [with T_OTHER = int, T =
long int]’:
./source.C:70:   instantiated from here
./source.C:33: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:https://qa.mandriva.com/> for instructions.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31027

[Bug c++/31027] Compiler segfaults in simple virtual inheritance situation

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|blocker                     |normal


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31027

[Bug c++/31027] Compiler segfaults in simple virtual inheritance situation

[v dot lesk at ic dot ac dot uk]

------- Comment #3 from v dot lesk at ic dot ac dot uk  2007-03-07 21:44 -------
Created an attachment (id=13166)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13166&action=view)
Code which triggers bug


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31027

[Bug c++/31027] [4.1/4.2/4.3 regression] Compiler segfaults in simple virtual inheritance situation

[bangerth at dealii dot org]

------- Comment #4 from bangerth at dealii dot org  2007-03-09 04:54 -------
Confirmed. This is a regression introduced in 4.0.x.

Somewhat shorter:
----------------
struct A {};

template<typename T>
struct C: virtual A {
    C() {};
    template<typename T_OTHER> C(const C<T_OTHER>&) {};
    C func(const class C<long>&) const;
    operator bool()const;
};

template<typename T>
struct D: C<T> {
    void func2() {
      C<int>a;
      a.func(a);
    }
};

void func3() {
  C<int>a;
  a.func(a);
}
--------------------

g/x> c++ -c x.cc
x.cc: In constructor 'C<T>::C(const C<T_OTHER>&) [with T_OTHER = int, T = long
int]':
x.cc:21:   instantiated from here
x.cc:6: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.suse.de/feedback> for instructions.


The funny thing is that we need to keep the class template D around, even
though it is completely unused...

W.


-- 

bangerth at dealii dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bangerth at dealii dot org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|rejects-valid               |ice-on-valid-code
   Last reconfirmed|0000-00-00 00:00:00         |2007-03-09 04:54:24
               date|                            |
            Summary|Compiler segfaults in simple|[4.1/4.2/4.3 regression]
                   |virtual inheritance         |Compiler segfaults in simple
                   |situation                   |virtual inheritance
                   |                            |situation


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31027

[Bug c++/31027] [4.1/4.2/4.3 regression] Compiler segfaults in simple virtual inheritance situation

[v dot lesk at ic dot ac dot uk]

------- Comment #5 from v dot lesk at ic dot ac dot uk  2007-03-09 11:28 -------
Can anyone suggest a workaround?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31027

[Bug c++/31027] [4.1/4.2/4.3 regression] Compiler segfaults in simple virtual inheritance situation

[v dot lesk at ic dot ac dot uk]

------- Comment #6 from v dot lesk at ic dot ac dot uk  2007-04-13 16:51 -------
I have verified that this bug also occurs on g++ 4.0.3.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31027

[Bug c++/31027] [4.1/4.2/4.3 regression] Compiler segfaults in simple virtual inheritance situation

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.1.3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31027

[Bug c++/31027] [4.1/4.2/4.3 regression] Compiler segfaults in simple virtual inheritance situation

[mmitchel at gcc dot gnu dot org]

-- 

mmitchel at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31027

[Bug c++/31027] [4.1/4.2/4.3 regression] Compiler segfaults in simple virtual inheritance situation

[paolo at gcc dot gnu dot org]

------- Comment #7 from paolo at gcc dot gnu dot org  2007-07-11 21:52 -------
Subject: Bug 31027

Author: paolo
Date: Wed Jul 11 21:52:04 2007
New Revision: 126558

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=126558
Log:
2007-07-11  Paolo Carlini  <pcarlini@suse.de>

        PR c++/31027
        * g++.dg/inherit/virtual4.C: New.

Added:
    trunk/gcc/testsuite/g++.dg/inherit/virtual4.C
Modified:
    trunk/gcc/testsuite/ChangeLog


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31027

[Bug c++/31027] [4.1/4.2/4.3 regression] Compiler segfaults in simple virtual inheritance situation

[paolo at gcc dot gnu dot org]

------- Comment #8 from paolo at gcc dot gnu dot org  2007-07-11 21:54 -------
Subject: Bug 31027

Author: paolo
Date: Wed Jul 11 21:54:36 2007
New Revision: 126559

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=126559
Log:
2007-07-11  Paolo Carlini  <pcarlini@suse.de>

        PR c++/31027
        * g++.dg/inherit/virtual4.C: New.

Added:
    branches/gcc-4_2-branch/gcc/testsuite/g++.dg/inherit/virtual4.C
Modified:
    branches/gcc-4_2-branch/gcc/testsuite/ChangeLog


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31027

[Bug c++/31027] [4.1 regression] Compiler segfaults in simple virtual inheritance situation

[pcarlini at suse dot de]

------- Comment #9 from pcarlini at suse dot de  2007-07-11 21:56 -------
Doesn't fail anymore in mainline and 4_2-branch.


-- 

pcarlini at suse dot de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.1/4.2/4.3 regression]    |[4.1 regression] Compiler
                   |Compiler segfaults in simple|segfaults in simple virtual
                   |virtual inheritance         |inheritance situation
                   |situation                   |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31027

[Bug c++/31027] [4.1 regression] Compiler segfaults in simple virtual inheritance situation

[jsm28 at gcc dot gnu dot org]

------- Comment #10 from jsm28 at gcc dot gnu dot org  2008-07-04 16:02 -------
Closing 4.1 branch.


-- 

jsm28 at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
      Known to fail|                            |4.1.3
         Resolution|                            |FIXED
   Target Milestone|4.1.3                       |4.2.1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31027