[Boost-bugs] [Boost C++ Libraries] #3034: Boost::Parameter: Shadow Variables and Unused Globals Cause Warnings/Errors When Headers Are Not in System Path

Subject: [Boost-bugs] [Boost C++ Libraries] #3034: Boost::Parameter: Shadow Variables and Unused Globals Cause Warnings/Errors When Headers Are Not in System Path
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-05-15 03:59:43

#3034: Boost::Parameter: Shadow Variables and Unused Globals Cause Warnings/Errors
When Headers Are Not in System Path
--------------------------------------+-------------------------------------
 Reporter:  gerickson_at_[hidden]  |       Owner:         
     Type:  Bugs                      |      Status:  new    
Milestone:  Boost 1.40.0              |   Component:  None   
  Version:  Boost 1.39.0              |    Severity:  Problem
 Keywords:                            |  
--------------------------------------+-------------------------------------
 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/parameter/aux_/arg_list.hpp
     boost/parameter/aux_/maybe.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?

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3034>
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