[boost] concept_check() fails for types from unnamed namespace on gcc 4.2.3

Subject: [boost] concept_check() fails for types from unnamed namespace on gcc 4.2.3
From: Adam Romanek (romanek.adam_at_[hidden])
Date: 2013-11-19 02:27:41

Dear Boosters!

I already posted this message to boost-users lists last week but I got 
no response. So here we are.

I have a problem compiling some source code that uses Boost 1.54 and gcc 
4.2.3 (it's a toolchain for a MIPS platform but that's irrelevant).

Basically there is a problem with checking concepts on types that come 
from unnamed namespaces. See the attached code example and compiler 
error message. Note that the same code compiles without any problems on 
gcc 4.6.3.

I've found a question on boost-dev list [1] and a ticket [2] related to 
this particular issue. Note that the ticket was closed with "worksforme" 
resolution, which I don't understand - the problem is still out there.

Now since Boost's minimal requirements are gcc 3.3 [3] then should I 
consider it a bug that I should report or is it a known issue? In case 
the latter is true then what should I do?

[1] 
http://boost.2283326.n4.nabble.com/concept-check-fails-with-types-declared-in-anonymous-namespace-gcc-4-2-3-td2645561.html
[2] https://svn.boost.org/trac/boost/ticket/2037
[3] http://www.boost.org/users/history/version_1_55_0.html

WBR,
Adam Romanek