[Dune] [#596] icc warns: pointless comparison of a uint with 0 (Attachment added)

[Dune]

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User who did this - Leonard Kern (kern) 

Attached to Project - Dune
Summary - icc warns: pointless comparison of a uint with 0
Task Type - Bug Report
Category - ISTL
Status - Unconfirmed
Assigned To - 
Operating System - Unspecified / All
Severity - Low
Priority - Normal
Reported Version - SVN
Due in Version - Undecided
Due Date - Undecided
Details - Hello Dune team!

Compiling dune-istl with Intels icpc (Version 11.1.046) gives a warning for dune/dune-istl/istl/tutorial/example.cc.

make[3]: Entering directory `/home/kern/dune/dune-istl/istl/tutorial'
icpc -std=c++0x -DHAVE_CONFIG_H -I. -I../..  -I/home/kern/dune/dune-common -I../.. -DHX_HAS_STDIOSTREAM  -I/home/kern/dune/extlib/include/amiramesh -DHX_HAS_STDIOSTREAM -MT example.o -MD -MP -MF .deps/example.Tpo -c -o example.o example.cc
example.cc(377): warning #186: pointless comparison of unsigned integer with zero
  	  if (i.index()-BW1>=0) i.insert(i.index()-BW1);
  	                   ^

example.cc(379): warning #186: pointless comparison of unsigned integer with zero
  	  if (i.index()-BW2>=0) i.insert(i.index()-BW2);
  	                   ^

mv -f .deps/example.Tpo .deps/example.Po
/bin/sh ../../libtool --tag=CXX   --mode=link icpc -std=c++0x  -I/home/kern/dune/extlib/include/amiramesh -DHX_HAS_STDIOSTREAM -L/home/kern/dune/dune-common/lib -ldunecommon  -o example example.o  
libtool: link: icpc -std=c++0x -I/home/kern/dune/extlib/include/amiramesh -DHX_HAS_STDIOSTREAM -o example example.o  -L/home/kern/dune/dune-common/lib /home/kern/dune/dune-common/lib/.libs/libdunecommon.a -lm
make[3]: Leaving directory `/home/kern/dune/dune-istl/istl/tutorial'

As far as I can tell, this warning is legitimate - Dune::ISTLAllocator::size_type is typedef'd as std::size_t which is unsigned. The interesting part is that g++ doesn't warn about that. I've attached a small example illustrating this.

-regards
Leonard.

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