[Insight-developers] GCC 4.8.2 compiler warning

[Bradley Lowekamp]

There are two loops which look like this:

https://github.com/Kitware/ITK/blob/master/Modules/Core/Common/include/itkImageAlgorithm.hxx#L148

 for ( unsigned int i = movingDirection; i + 1 < _RegionType::ImageDimension; ++i )

The use of the +1 there with the loop control variable is a little odd, but it was done to avoid a -1, and signed/unsigned interaction. I'd be curious of changing that made this warning go away, in exchanged for the signed/unsigned comparison warning.

Brad

On Nov 27, 2013, at 7:33 AM, "Johnson, Hans J" <hans-johnson at uiowa.edu> wrote:

> Thanks Brad.
> 
> 
> I too am beginning to think this compiler warnings are incorrect.
> 
> Hans
> 
> 
> On 11/27/13, 6:31 AM, "Bradley Lowekamp" <blowekamp at mail.nih.gov> wrote:
> 
>> Hans,
>> 
>> I have looked into this issue a couple times. It shows up on the Debian
>> sid (unstable) nightly build:
>> http://open.cdash.org/viewBuildError.php?type=1&buildid=3116766
>> 
>> The code in the ImageAlgorithm looks correct and no other system has
>> issues. Even VS debug which adds buffer over run check is OK.
>> 
>> Given that the error does not include line number, I figured it's deep in
>> the optimization phases of the compiler. I think the issue is with the
>> compiler.
>> 
>> That being said, you might be able to move a couple lines and statements
>> around to get rid of the warning. But I have not seen any issue with the
>> logic.
>> 
>> Brad
>> 
>> On Nov 26, 2013, at 8:41 PM, "Johnson, Hans J" <hans-johnson at uiowa.edu>
>> wrote:
>> 
>>> 
>>> I¹m getting the following warning on gcc 4.8.2:
>>> 
>>> In file included from
>>> /tmp/src/ITK/Modules/Core/Common/include/itkContinuousIndex.h:22:0,
>>>                from
>>> /tmp/src/ITK/Modules/Core/Common/include/itkImageRegion.h:34,
>>>                from
>>> /tmp/src/ITK/Modules/Core/Common/include/itkImage.h:21,
>>>                from
>>> /tmp/src/ITK/Modules/Core/Common/include/itkImageSource.h:32,
>>>                from
>>> 
>>> /tmp/src/ITK/Modules/Core/Mesh/include/itkTriangleMeshToBinaryImageFilter
>>> .h
>>> :21,
>>>                from
>>> 
>>> /tmp/src/ITK/Modules/Core/Mesh/test/itkTriangleMeshToBinaryImageFilterTes
>>> t3
>>> .cxx:19:
>>> /tmp/src/ITK/Modules/Core/Common/include/itkIndex.h: In static member
>>> function Œstatic void itk::ImageAlgorithm::DispatchedCopy(const
>>> InputImageType*, OutputImageType*, const typename
>>> InputImageType::RegionType&, const typename
>>> OutputImageType::RegionType&,
>>> itk::ImageAlgorithm::TrueType) [with InputImageType =
>>> itk::Image<unsigned
>>> char, 3u>; OutputImageType = itk::Image<unsigned char, 3u>; typename
>>> InputImageType::RegionType = itk::ImageRegion<3u>; typename
>>> OutputImageType::RegionType = itk::ImageRegion<3u>;
>>> itk::ImageAlgorithm::TrueType = std::tr1::integral_constant<bool,
>>> true>]¹:
>>> /tmp/src/ITK/Modules/Core/Common/include/itkIndex.h:226:19: warning:
>>> array
>>> subscript is above array bounds [-Warray-bounds]
>>>  { return m_Index[dim]; }
>>>                  ^
>>> /tmp/src/ITK/Modules/Core/Common/include/itkIndex.h:226:19: warning:
>>> array
>>> subscript is above array bounds [-Warray-bounds]
>>> /tmp/src/ITK/Modules/Core/Common/include/itkIndex.h:226:19: warning:
>>> array
>>> subscript is above array bounds [-Warray-bounds]
>>>  { return m_Index[dim]; }
>>>                  ^
>>> 
>>> It looks serious to me, but I don¹t know how to decipher it.
>>> 
>>> 
>>> I¹m not going to be able to look at this anytime soon.
>>> 
>>> Hans
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
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> 
> 
> 
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