[Dune] [#1101] nullptr test fails if configureflags include -Werror

[Dune]

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User who did this - Matthias Wohlmuth (matthias) 

Attached to Project - Dune
Summary - nullptr test fails if configureflags include -Werror
Task Type - Bug Report
Category - Common
Status - New
Assigned To - 
Operating System - Linux
Severity - Low
Priority - Low
Reported Version - SVN (pre2.3)
Due in Version - Undecided
Due Date - Undecided
Details - The current implementation of the nullptr check results in an unused variable warning. Thus, if Dune is configured with -Werror, the build system claims that there is no nullptr implementation present and adds the fallback implementation in dune/common/nullptr.h . However, if it is present in one of the system includes, this causes a compiler error because of two colliding nullptr implementations (system and fallback). 
So I propose to fix the unused variable warning, for example by the following patch:

--- cxx0x_nullptr.m4    (revision 6709)                                                                                                                                                   
+++ cxx0x_nullptr.m4    (working copy)                                                                                                                                                    
@@ -5,6 +5,7 @@                                                                                                                                                                           
     AC_LANG_PUSH([C++])                                                                                                                                                                  
     AC_TRY_COMPILE([],[
       char* ch = nullptr;
+      if(ch!=nullptr) { ; }
       ], 
       dune_cv_nullptr_support=yes,
       dune_cv_nullptr_support=no)


More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=1101

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