[ITK] [ITK-dev] Problems with Change in itkStaticConstMacro

[Bradly Lowekamp]

Hello Luc,

Thanks for looking into this.

This bug is related to the older GCC 4.1 compiler that is found standard with Redhat 5 and Fedora 5 and used for distributions such as Anaconda’s Python. I apologize for the incorrect version before.

Here is some ITK code to reproduce the error:
http://review.source.kitware.com/#/c/20674/

Thank you for exploring a minimal test case. Your code does compile and run OK with GCC 4.1.

As a work around for SimpleITK I have disabled the SimpleITK Explicit library for now [1], this is not an optimal solution, and we should try to get explicit instantiation working again with GCC 4.1

Brad


https://github.com/SimpleITK/SimpleITK/compare/next#diff-af3b638bc2a3e6c650974192a53c7291


> On Jan 20, 2016, at 4:39 AM, Luc Hermitte <luc.hermitte at c-s.fr> wrote:
> 
> Le 20/01/2016 09:57, Luc Hermitte a écrit :
>> Hello,
>> 
>> Le 19/01/2016 21:19, Bradley Lowekamp a écrit :
>>> Hello,
>>> 
>>> My release builds for SimpleITK are having significant problems with the
>>> change done here [1] to the itkStaticConstMacro.
>>> 
>>> My builds on Redhat 5, with gcc 5.1, are filling my disk with errors
>>> along the following:
>>> [...]
>> [...]
> 
>>> I’ll look into alternatives...
>> 
>> Can you isolate the error on a simple test case that reproduce the issue?
> 
> I've tried the file attached on https://ideone.com/SGlJ1i but it seems
> valid with GCC 5.1.
> 
> However, in C++11, constexpr is required. And my g++ 4.8.2, and clang++
> as well, tell me:
> 
> || g++ -std=c++03 -Werror -Wall -pedantic    extern-templ.cpp   -o
> extern-templ
> extern-templ.cpp|19 col 24| error: ISO C++ 1998 forbids the use of
> 'extern' on explicit instantiations [-Werror=pedantic]
> ||  extern template struct Bar<Foo<int>, Foo<double> >;
> 
> 
> What differs in SimpleITK source code?
> 
> 
> --Luc
> <extern-templ.cpp>

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