gcc error message and Boost.static_assert

[Vladimir Prus]

Hello,
it appears that somewhere between 3.2 and 3.3 one of the error messages of gcc 
was slightly changed, but that change makes one of the C++ Boost libraries 
much less usable.

The library is Boost.static_assert and it the same as assert, only during 
compile time. The docs are at:

     http://www.boost.org/libs/static_assert/static_assert.htm

One of the uses is generating user-friendly error messages when template 
classes are used in wrong way.

On the following program:

#include <boost/static_assert.hpp>

int main()
{
    BOOST_STATIC_ASSERT(1 > 2);
    return 0;
}

I get these error messages:

ghost@zigzag:/tmp$ g++-3.2 -I ~/Work/boost static_assert.cpp
static_assert.cpp: In function `int main()':
static_assert.cpp:6: `sizeof' applied to incomplete type `
   boost::STATIC_ASSERTION_FAILURE<false>'

ghost@zigzag:/tmp$ g++-3.3 -I ~/Work/boost static_assert.cpp
static_assert.cpp: In function `int main()':
static_assert.cpp:6: error: invalid application of `sizeof' to an incomplete
   type

ghost@zigzag:/tmp$ g++-3.4 -I ~/Work/boost static_assert.cpp
static_assert.cpp: In function `int main()':
static_assert.cpp:6: error: invalid application of `sizeof' to an incomplete 
type

So, starting with 3.3 gcc does not include the name of the class when sizeof 
is applied to incomplete type -- the trick static_assert uses. As the result, 
instead of very visible STATIC_ASSERTION_FAILURE user gets regular error 
message and need to look though all instantination to understand what's 
wrong.

Do you think it's possible to put class name back in the error message, or 
there's some other workaround?

Thanks in advance,
Volodya