id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
5279	[Foreach] Compile-time const rvalue detection fails with gcc 4.6	mimomorin@…	Eric Niebler	"Recently, gcc 4.6 changed the behavior of rvalue conversions (from gcc-4.6-20110305). 
You can see the related info here: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47851

This breaks compile-time const rvalue detection in Boost.Foreach; 
Const rvalues are incorrectly treated as lvalues, and so a segmentation fault occurs in the following code: 

{{{
#include <list>
#include <boost/foreach.hpp>

typedef const std::list<int> clist;

int main (int argc, char* argv[])
{
    BOOST_FOREACH(int x, clist(3)) {}
    return 0;
}
}}}

Though gcc 4.6 is not yet released, I think this behavior is highly likely to happen in the release version. So I reported this problem here. "	Patches	closed	Boost 1.47.0	foreach	Boost Development Trunk	Problem	fixed