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* c++/7400: dynamic_cast segfaults with -shared option
@ 2002-07-24 16:26 t6
0 siblings, 0 replies; 4+ messages in thread
From: t6 @ 2002-07-24 16:26 UTC (permalink / raw)
To: gcc-gnats
>Number: 7400
>Category: c++
>Synopsis: dynamic_cast segfaults with -shared option
>Confidential: no
>Severity: critical
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Wed Jul 24 16:26:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: t6@pobox.com
>Release: 3.0.4
>Organization:
>Environment:
Redhat 7.3
>Description:
The following source generates code that causes a segfault at run-time (in dynamic_cast I believe).
class A
{
public:
virtual ~A() {}
};
class B : public A
{};
class C : public B
{};
int main()
{
C* c(new C());
A* a(c);
// dynamic_cast segfaults when compiled with -shared
B* b = dynamic_cast<B*>(a);
}
Environment is Redhat 7.3 with gcc3 installed from an .rpm file from redhat's site (distributed with Redhat 7.2):
gcc version 3.0.4 (Red Hat Linux 7.2 3.0.4-1)
Output from g++3 -v -save-temps -shared source.cpp:
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.0.4/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --host=i386-redhat-linux --with-system-zlib
Thread model: posix
gcc version 3.0.4 (Red Hat Linux 7.2 3.0.4-1)
/usr/lib/gcc-lib/i386-redhat-linux/3.0.4/cpp0 -lang-c++ -D__GNUG__=3 -D__GXX_DEPRECATED -D__EXCEPTIONS -D__GXX_ABI_VERSION=100 -v -D__GNUC__=3 -D__GNUC_MINOR__=0 -D__GNUC_PATCHLEVEL__=4 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__ -D__linux__ -D__unix -D__linux -Asystem=posix -D__NO_INLINE__ -D__STDC_HOSTED__=1 -D_GNU_SOURCE -Acpu=i386 -Amachine=i386 -Di386 -D__i386 -D__i386__ -D__tune_i386__ source.cpp source.ii
GNU CPP version 3.0.4 (Red Hat Linux 7.2 3.0.4-1) (cpplib) (i386 Linux/ELF)
ignoring nonexistent directory "/usr/i386-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/g++-v3
/usr/include/g++-v3/i386-redhat-linux
/usr/include/g++-v3/backward
/usr/local/include
/usr/lib/gcc-lib/i386-redhat-linux/3.0.4/include
/usr/include
End of search list.
/usr/lib/gcc-lib/i386-redhat-linux/3.0.4/cc1plus -fpreprocessed source.ii -quiet -dumpbase source.cpp -version -o source.s
GNU CPP version 3.0.4 (Red Hat Linux 7.2 3.0.4-1) (cpplib) (i386 Linux/ELF)
GNU C++ version 3.0.4 (Red Hat Linux 7.2 3.0.4-1) (i386-redhat-linux)
compiled by GNU C version 3.0.4 (Red Hat Linux 7.2 3.0.4-1).
as -V -Qy -o source.o source.s
GNU assembler version 2.11.93.0.2 (i386-redhat-linux) using BFD version 2.11.93.0.2 20020207
/usr/lib/gcc-lib/i386-redhat-linux/3.0.4/collect2 -m elf_i386 -shared /usr/lib/gcc-lib/i386-redhat-linux/3.0.4/../../../crti.o /usr/lib/gcc-lib/i386-redhat-linux/3.0.4/crtbeginS.o -L/usr/lib/gcc-lib/i386-redhat-linux/3.0.4 -L/usr/lib/gcc-lib/i386-redhat-linux/3.0.4/../../.. source.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/lib/gcc-lib/i386-redhat-linux/3.0.4/crtendS.o /usr/lib/gcc-lib/i386-redhat-linux/3.0.4/../../../crtn.o
----------------------
>How-To-Repeat:
Compile above source with
g++3 -shared source.cpp
and run ./a.out
Segmentation fault results.
(NB: Although this generates the a.out in a single step, my application generates similar code to a .o which is then linked into a .so and finally into an executable with main(). In tat case the gdb debugger reports the file and line containing the dynamic_cast. In the code snippet above the gdb debugger doesn't seem to know anything about the stack (??!) )
>Fix:
Doesn't happen if -shared is not used. I don't know of any way to generate shared .so library files without using -shared option.
>Release-Note:
>Audit-Trail:
>Unformatted:
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: c++/7400: dynamic_cast segfaults with -shared option
@ 2002-08-22 6:46 David Jung
0 siblings, 0 replies; 4+ messages in thread
From: David Jung @ 2002-08-22 6:46 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c++/7400; it has been noted by GNATS.
From: David Jung <jungdl@ornl.gov>
To: gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org,
nobody@gcc.gnu.org
Cc:
Subject: Re: c++/7400: dynamic_cast segfaults with -shared option
Date: Thu, 22 Aug 2002 09:35:42 -0400
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7400
Also occurs in gcc 3.2-1 (from Redhat null (8.0beta?) ).
Crash is slightly different (tries to access address 0x0).
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: c++/7400: dynamic_cast segfaults with -shared option
@ 2002-08-16 13:36 David Jung
0 siblings, 0 replies; 4+ messages in thread
From: David Jung @ 2002-08-16 13:36 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c++/7400; it has been noted by GNATS.
From: David Jung <jungdl@ornl.gov>
To: gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org,
nobody@gcc.gnu.org, t6@pobox.com
Cc:
Subject: Re: c++/7400: dynamic_cast segfaults with -shared option
Date: Fri, 16 Aug 2002 15:31:14 -0400
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7400
As of gcc3.1, dynamic_cast<>() still cannot be used in any programs
that use shared libs.
Specifically, the version I tried:
g++3 (GCC) 3.1 20020604 (Red Hat Linux 7.3 3.1-5)
I believe this discussion may be relevant:
http://gcc.gnu.org/ml/gcc/2002-06/msg01699.html
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: c++/7400: dynamic_cast segfaults with -shared option
@ 2002-08-16 12:36 David Jung
0 siblings, 0 replies; 4+ messages in thread
From: David Jung @ 2002-08-16 12:36 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c++/7400; it has been noted by GNATS.
From: David Jung <jungdl@ornl.gov>
To: gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org,
nobody@gcc.gnu.org
Cc:
Subject: Re: c++/7400: dynamic_cast segfaults with -shared option
Date: Fri, 16 Aug 2002 15:27:28 -0400
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7400
As of gcc3.1, dynamic_cast<>() still cannot be used in any programs
that use shared libs.
Specifically, the version I tried:
g++3 (GCC) 3.1 20020604 (Red Hat Linux 7.3 3.1-5)
I believe this discussion may be relevant:
http://gcc.gnu.org/ml/gcc/2002-06/msg01699.html
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2002-08-22 13:36 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2002-07-24 16:26 c++/7400: dynamic_cast segfaults with -shared option t6
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2002-08-16 13:36 David Jung
2002-08-22 6:46 David Jung
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