[Bug c++/29910] New: g++ compiled code SEGFAULTs if regparm(3) virtual destructor is overridden in a template derived class
massimiliano dot ghilardi at gmail dot com
gcc-bugzilla@gcc.gnu.org
Mon Nov 20 12:07:00 GMT 2006
This is the second of 3 related g++ bugs concerning regparm(3) on ix86.
Problem: g++ 3.4.6, 4.0.4, 4.1.2 (and possibly others) do not correctly handle
__attribute((regparm(3))) on virtual methods (in particular destructors)
overridden in a _template_ derived class.
If a Base class declares a virtual destructor with __attribute((regparm(3))),
and a _template_ Derived class overrides the destructor, the compiled program
will SEGFAULT
even if the Derived destructor is explicitly tagged __attribute((regparm(3)))
Test case:
--------------------------------------------------
// compile on ix86 with: g++ -Wall -O
class Base {
public:
virtual __attribute((regparm(3))) ~Base() { }
};
template<class T> class Derived : public Base {
public:
virtual __attribute((regparm(3))) ~Derived() { }
};
int main() {
Base * s = new Derived<int>();
delete s;
return 0;
}
--------------------------------------------------
The test case above works correctly if the Derived class is NOT a template.
gcc versions tested: 3.4.6, 4.0.4, 4.1.2
>>>>> g++-3.4.6 -v <<<<<
Reading specs from /usr/lib/gcc/i486-linux-gnu/3.4.6/specs
Configured with: ../src/configure -v --enable-languages=c,c++,f77,pascal
--prefix=/usr --libexecdir=/usr/lib --with-gxx-include-dir=/usr/include/c++/3.4
--enable-shared --with-system-zlib --enable-nls --without-included-gettext
--program-suffix=-3.4 --enable-__cxa_atexit --enable-clocale=gnu
--enable-libstdcxx-debug --with-tune=i686 i486-linux-gnu
Thread model: posix
gcc version 3.4.6 (Debian 3.4.6-4)
>>>>> g++-4.0.4 -v <<<<<
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --enable-languages=c,c++,java
--prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix --enable-nls
--program-suffix=-4.0 --enable-__cxa_atexit --enable-clocale=gnu
--enable-libstdcxx-debug --enable-java-awt=gtk-default --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-4.0-1.4.2.0/jre --with-tune=i686
--enable-checking=release i486-linux-gnu
Thread model: posix
gcc version 4.0.4 20060904 (prerelease) (Debian 4.0.3-7)
>>>>> g++-4.1.2 -v <<<<<
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v
--enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr
--enable-shared --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix --enable-nls
--program-suffix=-4.1 --enable-__cxa_atexit --enable-clocale=gnu
--enable-libstdcxx-debug --enable-mpfr --with-tune=i686
--enable-checking=release i486-linux-gnu
Thread model: posix
gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-20)
--
Summary: g++ compiled code SEGFAULTs if regparm(3) virtual
destructor is overridden in a template derived class
Product: gcc
Version: 4.1.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: massimiliano dot ghilardi at gmail dot com
GCC build triplet: i486-linux-gnu
GCC host triplet: i486-linux-gnu
GCC target triplet: i486-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29910
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