[boost] [multi-array] warning on mingw caused by assert macro

Subject: [boost] [multi-array] warning on mingw caused by assert macro
From: Ronan Trépos (Ronan.Trepos_at_[hidden])
Date: 2013-05-24 04:24:20

Hello boost comunity,

I found a warning using boost/multi-array  (boost 1.53) on mingw.

The warning message :

boost/multi_array/base.hpp:503:13: attention : unused variable 
'bound_adjustment'

When compiling a simple example including muti-array with the command line :

c:\MinGW\bin\g++.exe  -Wall -Wextra -O2 -DNDEBUG -g 
-Ic:/natifvle/install/boost/include/boost-1_53 -o MyExample.o -c 
MyExample.cpp

The reason is that a locale variable bound_adjustement, before line 503 
of multi_array/base.hpp, is defined and computed only if 
BOOST_DISABLE_ASSERT is not set.
The line after, a BOOST_ASSERT is called using bound_adjustement. Since 
BOOST_DISABLE_ASSERT is not set,  BOOST_ASSERT is defined as the mingw 
macro "assert" in boost/assert.hpp. Finally, mingw assert macro  (see 
Mingw/include/assert.h) is defined as ((void) 0) if NDEBUG is defined 
(this is the case in my example).
It took me a long time to see the problem.

So my questions are :
- Do I miss use the combination of NDEBUG and BOOST_DISABLE_ASSERTS ? 
Eg. if NDEBUG and BOOST_DISABLE_ASSERTS  are set (or unset) together, 
then I have no warning. Should they be set to the same value ?
- Or should boost/assert.hpp take into account NDEBUG for defining the 
macro BOOST_ASSERT (only for mingw ?)

Best regards
Ronan Trépos

-- 
Trépos Ronan
INRA unité MIAT, équipe RECORD, Toulouse
http://carlit.toulouse.inra.fr/wikiz/index.php/Ronan_TREPOS
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