The following mistyped illegal code compiles. The resulted executable crashes
because of the accepted illegal pointers.
// ---------------------------------------------------------------------------
struct Base {};
struct Derived : protected Base {
operator const Base* () const {
return *this; // --- Illegal type, should be written without *
}
};
int main()
{
Derived der;
const Base *bp = static_cast<const Base*>(der);
(void) bp; // --- Avoid warning
return 0;
}
// ------------------------------------------------------------------------
Compiled with the command:
g++ -Wall -ansi -pedantic source.cpp
Detailed configuration info is:
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --host=i386-redhat-linux
Thread model: posix
gcc version 3.4.1 20040714 (Red Hat 3.4.1-7)
GNU C++ version 3.4.1 20040714 (Red Hat 3.4.1-7) (i386-redhat-linux)
compiled by GNU C version 3.4.1 20040714 (Red Hat 3.4.1-7).
GGC heuristics: --param ggc-min-expand=64 --param ggc-min-heapsize=64160
as -V -Qy -o /tmp/cco9w5Jv.o /tmp/ccCvMY8N.s
--
Summary: illegal code compiles and segfaults in runtime
Product: gcc
Version: 3.4.1
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: istvan dot zolyomi at gmail dot com
CC: gcc-bugs at gcc dot gnu dot org,scamel at elte dot hu
GCC build triplet: gcc version 3.4.1 20040714 (Red Hat 3.4.1-7)
GCC host triplet: Linux
GCC target triplet: i386
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18855
