Bug#633443: g++-4.6: ICE on mips(el) when building drizzle

[Aurelien Jarno <aurel32@debian.org>]

Package: g++-4.6
Version: 4.6.1-2
Severity: normal
Tags: upstream
Forwarded: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49696

When building drizzle on mips, g++ crash with an internal compiler
error:

| $ g++ -Wall -c ./testcase-min.ii
| ./testcase-min.ii: In member function 'virtual bool LoggingStats::post(drizzled::Session*)':
| ./testcase-min.ii:50:1: warning: no return statement in function returning non-void [-Wreturn-type]
| ./testcase-min.ii: In member function 'drizzled::internal::gcc_traits<T, D>::value_type drizzled::internal::gcc_traits<T, D>::fetch(const volatile value_type*)
|  const volatile [with T = bool, D = bool, drizzled::internal::gcc_traits<T, D>::value_type = bool]':
| ./testcase-min.ii:12:5: error: unrecognizable insn:
| (insn 16 15 17 3 (parallel [
|             (set (reg:SI 205)
|                 (mem/v:SI (reg:SI 200) [-1 S4 A32]))
|             (set (mem/v:SI (reg:SI 200) [-1 S4 A32])
|                 (unspec_volatile:SI [
|                         (reg:SI 203)
|                         (reg:SI 204)
|                         (plus:SI (reg:SI 205)
|                             (const_int 0 [0]))
|                     ] UNSPEC_SYNC_OLD_OP_12))
|             (clobber (scratch:SI))
|         ]) ./testcase-min.ii:11 -1
|      (nil))
| ./testcase-min.ii:12:5: internal compiler error: in extract_insn, at recog.c:2109
| Please submit a full bug report,
| with preprocessed source if appropriate.
| See <file:///usr/share/doc/gcc-4.6/README.Bugs> for instructions.

The problem is reproducible with versions 4.4, 4.5 and 4.6, but 
not with version 4.3 (I didn't test earlier versions). I have already
forwarded the bug to the upstream bugzilla, with a reduced testcase.

-- System Information:
Debian Release: wheezy/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: mips (mips64)

Kernel: Linux 2.6.32-5-5kc-malta
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

namespace drizzled
{
	namespace internal
	{
		template<typename T, typename D> class gcc_traits
		{
			public:
				typedef T value_type;
				inline value_type fetch(const volatile value_type *value) const volatile
				{
					return __sync_fetch_and_add(const_cast<value_type *>(value), 0);
				}
		};
		template<typename I> struct atomic_base         {           volatile I my_value;        };
		template<typename I, typename D, typename T > class atomic_impl: private atomic_base<I>
		{
			T traits;           
			public:   typedef I value_type;   
			operator value_type() const volatile
			{
				return traits.fetch(&this->my_value);
			}
		};
	}
	template<typename T> struct atomic
	{
	};
	template<> struct atomic<bool> : internal::atomic_impl<bool,bool,internal::gcc_traits<bool,bool> >
	{
	};
	class Session
	{
	};
}
class LoggingStats
{
	virtual bool post(drizzled::Session *session);
	bool isEnabled() const
	{
		return is_enabled;
	}
	drizzled::atomic<bool> is_enabled;
};
using namespace drizzled;
bool LoggingStats::post(Session *session)
{
	if (! isEnabled())
	{
	}
}