[Bug libstdc++/44045] New: initialization of array of shared_ptr's with initializer list causes compiler segfault

[Bug libstdc++/44045] New: initialization of array of shared_ptr's with initializer list causes compiler segfault

[lynczu at gmail dot com]

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I was able to reproduce this problem with gcc-4.4.4 on x86_64 (Exherbo) and
gcc-4.5.0 on x86 (Arch Linux 2009.08). Just to be honest I'm not quite sure, if
the code used to build this testcase if valid C++, but it seems to me that
there is some issue with initializing array of shared_ptr's with initializer
list (or throwing an error if it's not valid). It works when I use std::array
instead of C-like array for storing these shared_ptr's. Here's the output from
gcc-4.4.4:

Using built-in specs.
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/paludis/build/sys-devel-gcc-4.4.4/work/gcc-4.4.4/configure
--prefix=/usr --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu
--mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share
--sysconfdir=/etc --localstatedir=/var/lib --disable-dependency-tracking
--disable-silent-rules --enable-fast-install --libdir=/usr/lib64
--enable-multilib --libdir=/usr/lib64 --enable-languages=c++,objc,obj-c++,java
--enable-libstdcxx-pch=yes --enable-nls --program-suffix=-4.4
--with-pkgversion='exherbo gcc-4.4.4' --with-cloog --with-ppl
--with-system-zlib --enable-libgomp --disable-libssp
Thread model: posix
gcc version 4.4.4 (exherbo gcc-4.4.4) 
COLLECT_GCC_OPTIONS='-std=c++0x' '-Wall' '-save-temps' '-v' '-o' 'gcc_bugoo'
'-shared-libgcc' '-mtune=generic'
 /usr/libexec/gcc/x86_64-pc-linux-gnu/4.4.4/cc1plus -E -quiet -v -D_GNU_SOURCE
gcc_bug.cc -mtune=generic -std=c++0x -Wall -fpch-preprocess -o gcc_bug.ii
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory
"/usr/lib64/gcc/x86_64-pc-linux-gnu/4.4.4/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib64/gcc/x86_64-pc-linux-gnu/4.4.4/../../../../include/c++/4.4.4

/usr/lib64/gcc/x86_64-pc-linux-gnu/4.4.4/../../../../include/c++/4.4.4/x86_64-pc-linux-gnu

/usr/lib64/gcc/x86_64-pc-linux-gnu/4.4.4/../../../../include/c++/4.4.4/backward
 /usr/lib64/gcc/x86_64-pc-linux-gnu/4.4.4/include
 /usr/lib64/gcc/x86_64-pc-linux-gnu/4.4.4/include-fixed
 /usr/include
End of search list.
COLLECT_GCC_OPTIONS='-std=c++0x' '-Wall' '-save-temps' '-v' '-o' 'gcc_bugoo'
'-shared-libgcc' '-mtune=generic'
 /usr/libexec/gcc/x86_64-pc-linux-gnu/4.4.4/cc1plus -fpreprocessed gcc_bug.ii
-quiet -dumpbase gcc_bug.cc -mtune=generic -auxbase gcc_bug -Wall -std=c++0x
-version -o gcc_bug.s
GNU C++ (exherbo gcc-4.4.4) version 4.4.4 (x86_64-pc-linux-gnu)
        compiled by GNU C version 4.4.4, GMP version 4.3.2, MPFR version 2.4.2.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 1311f0de2e0742c3e083aaa93b5e2b4b
gcc_bug.cc: In function ‘int main()’:
gcc_bug.cc:20: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


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           Summary: initialization of array of shared_ptr's with initializer
                    list causes compiler segfault
           Product: gcc
           Version: 4.4.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: lynczu at gmail dot com
  GCC host triplet: x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

[Bug libstdc++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[lynczu at gmail dot com]

------- Comment #1 from lynczu at gmail dot com  2010-05-08 23:08 -------
Created an attachment (id=20608)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20608&action=view)
preprocessed file gcc-4.4.4 x86_64


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

[Bug libstdc++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[lynczu at gmail dot com]

------- Comment #2 from lynczu at gmail dot com  2010-05-08 23:09 -------
Created an attachment (id=20609)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20609&action=view)
preprocessed file gcc-4.5.0 x86


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

[Bug c++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[paolo dot carlini at oracle dot com]

------- Comment #3 from paolo dot carlini at oracle dot com  2010-05-08 23:15 -------
If it's a segmentation fault, isn't a library issue, that for sure.


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paolo dot carlini at oracle dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|libstdc++                   |c++


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

[Bug libstdc++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[lynczu at gmail dot com]

------- Comment #4 from lynczu at gmail dot com  2010-05-08 23:44 -------
On my two different systems it ends with segfault and on a third one (with
Ubuntu gcc-4.4.0) it throws "incompatible types in assignment" error. So
apparently I was in a bit too hurry in filling this bug error, sorry about
that. May those segfaults affect somehow further compilations or just I need to
not bother? 


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lynczu at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
          Component|c++                         |libstdc++
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

[Bug libstdc++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[paolo dot carlini at oracle dot com]

------- Comment #5 from paolo dot carlini at oracle dot com  2010-05-09 01:20 -------
Maybe I was not clear enough: **any** segmentation fault is a bug in the
compiler. It must **never** seg fault, no matter which is the input. Thus, the
point is simply that a segmentation must be reported as a C++ (or C, Fortran,
whatever) bug, not as library bug. If you see a seg fault, first double check
that you can reproduce the problem also with a recent compiler, reduce the
testcase as much as possible (maybe also helping yourself with "delta"), and
file a front-end bug. Thanks!


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

[Bug c++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[lynczu at gmail dot com]

------- Comment #6 from lynczu at gmail dot com  2010-05-09 09:58 -------
reopened then


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lynczu at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
          Component|libstdc++                   |c++
         Resolution|INVALID                     |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

[Bug c++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[dougsemler at gmail dot com]

------- Comment #7 from dougsemler at gmail dot com  2010-05-09 16:24 -------
Reduced test case:

# 1 "gcc_bug2.cc"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "gcc_bug2.cc"
struct base
{
   virtual ~base() { }
};

int main()
{
 base ptr_array[1];
 ptr_array = { base() };
}


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

[Bug c++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[paolo dot carlini at oracle dot com]

------- Comment #8 from paolo dot carlini at oracle dot com  2010-05-09 16:47 -------
Many thanks, this will help the debugging a lot. CC-ing Jason...


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paolo dot carlini at oracle dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

[Bug c++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[paolo dot carlini at oracle dot com]

-- 

paolo dot carlini at oracle dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2010-05-09 16:51:56
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

[Bug c++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[jason at gcc dot gnu dot org]

-- 

jason at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |jason at gcc dot gnu dot org
                   |dot org                     |
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2010-05-09 16:51:56         |2010-05-09 20:36:10
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

[Bug c++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[jason at gcc dot gnu dot org]

------- Comment #9 from jason at gcc dot gnu dot org  2010-05-10 15:30 -------
The testcase is invalid; 5.17 doesn't allow assignment to an array from an
initializer list (although I'm not sure why not).  But certainly we should give
an error rather than crash.


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jason at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-invalid-code
   Target Milestone|---                         |4.6.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

[Bug c++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[dougsemler at gmail dot com]

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------- Comment #10 from dougsemler at gmail dot com  2010-05-10 17:18 -------
Well, is it really invalid code with -std=c++0x?

The virutal destructor seems to be causing the issue.

With gcc 4.4.3 (after changing virtual ~base() to virtual void func()):

$ g++ gcc_bug.cc 
gcc_bug.cc: In function ‘int main()’:
gcc_bug.cc:9: warning: extended initializer lists only available with
-std=c++0x or -std=gnu++0x

$ g++ gcc_bug.cc  -std=c++0x
$


So you can see that g++ sees this as valid code.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

[Bug c++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[redi at gcc dot gnu dot org]

------- Comment #11 from redi at gcc dot gnu dot org  2010-05-10 17:32 -------
(In reply to comment #10) 
> So you can see that g++ sees this as valid code.

I think that's a bug too


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

[Bug c++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[jason at gcc dot gnu dot org]

------- Comment #12 from jason at gcc dot gnu dot org  2010-05-10 18:38 -------
Subject: Bug 44045

Author: jason
Date: Mon May 10 18:37:56 2010
New Revision: 159243

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=159243
Log:
        PR c++/44045
        * typeck.c (cp_build_modify_expr): Complain about assignment to
        array from init list.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/initlist33.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/typeck.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/g++.dg/cpp0x/initlist26.C
    trunk/gcc/testsuite/g++.dg/cpp0x/initlist28.C


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

[Bug c++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[jason at gcc dot gnu dot org]

------- Comment #13 from jason at gcc dot gnu dot org  2010-05-10 18:40 -------
Fixed for 4.6.


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jason at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

[Bug c++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |denis.campredon at gmail
                   |                            |dot com

--- Comment #15 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-03-09 16:51:05 UTC ---
*** Bug 48050 has been marked as a duplicate of this bug. ***

[Bug c++/44045] initialization of array of shared_ptr's with initializer list causes compiler segfault

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44045

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |magicdice at hotmail dot
                   |                            |com

--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> 2010-12-08 12:33:39 UTC ---
*** Bug 46848 has been marked as a duplicate of this bug. ***