https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64641
Bug ID: 64641
Summary: ICE in get_polymorphic_call_info with C-cast to
(polymorphic) object-reference
Product: gcc
Version: 4.9.2
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: meisenmann....@fh-salzburg.ac.at
Hi!
I've analyzed some (IMHO) malicious/mallformed cast(s) to a reference-type by
using a C-cast. I've determined a sample, which results in an ICE message on
GCC (release 4.9.2). I've used a (private) build of an GCC Cross-compiler
(target=i386-elf, host=mingw32), but the Mingw-W64 build of GCC 4.9.2 *) shows
the same result.
*) Downloaded from
http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win32/Personal%20Builds/mingw-builds/4.9.2/threads-posix/dwarf/
(package i686-4.9.2-release-posix-dwarf-rt_v3-rev1.7z)
Following (minimal) sample:
/*-----*/
class A
{
public:
virtual int get() const { return m_val; }
protected:
int m_val;
};
int Test2(int* arg)
{
A& ref = (A&) arg;
return ref.get();
}
/*-----*/
and "gcc -c test.cpp" will show:
test.cpp: In function 'int Test2(int*)':
test.cpp:14:1: internal compiler error: in get_polymorphic_call_info, at
ipa-dev
irt.c:1223
}
^
Prior GCC releases (like 4.8.3 or 4.6.4) or the MS-VS2010 compiler does not
show a similar issue or compiler-warning/error.
Best regards from Salzburg,
Markus
