id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
3031	Boost::Accumulators: Shadow Variables and Unused Globals Cause Warnings/Errors When Headers Are Not in System Path	gerickson@…	Eric Niebler	"I've recently added Boost to an Xcode 3.1.2 project with the following warnings enabled in GCC/G++ 4.0.1:

    -Werror -Wreturn-type -Wunused-function -Wunused-label -Wunused-variable 
    -Wshadow

Unfortunately, when boost is not installed in a ""system"" path--as is the case here--unused and shadow variable warnings cause the build to fail when warnings are treated as errors. This issue last came up for me about a year ago in 1_35_0 with filesystem.hpp:

http://article.gmane.org/gmane.comp.lib.boost.user/38297/match=shadow+variables+cause

The included headers this time are:

    boost/accumulators/accumulators.hpp
    boost/accumulators/statistics/stats.hpp
    boost/accumulators/statistics/rolling_mean.hpp

To test and fix, I isolated with:

    printf ""#include <${BoostHeader}>\nint main(void) {
    return 0; }"" | /Developer/usr/bin/gcc-4.0 -x c++ -Wall -Wshadow -Werror 
    -o test -I${BoostRoot}/boost/include -

The patch to address this is as follows and impacts the headers below:

    boost/accumulators/framework/accumulator_set.hpp
    boost/accumulators/framework/accumulators/droppable_accumulator.hpp
    boost/accumulators/statistics/rolling_mean.hpp
    boost/accumulators/statistics/rolling_window.hpp
    boost/accumulators/statistics_fwd.hpp

Patches for other headers to be filed separately. Because this problem seems to come up frequently, perhaps there is a way -Wshadow and -Wall can be forced for all unit tests?"	Bugs	closed	To Be Determined	accumulator	Boost 1.39.0	Problem	fixed