[ITK-dev] Problems with Change in itkStaticConstMacro

[Bradly Lowekamp]

Just to re-iterate the importance of maintain full support for GCC 4.1 with the ability is instantiate ITK templates, here is the new Python PEP 513[1], which suggests using CentOS with gcc 4.1

Also note my working around for disabling SimpleITK’s explicit template instantiation, did not work [2] yet.

Brad


[1] https://www.python.org/dev/peps/pep-0513/ <https://www.python.org/dev/peps/pep-0513/>
[2] https://open.cdash.org/index.php?project=SimpleITK

> On Jan 20, 2016, at 10:00 AM, Bradly Lowekamp <blowekamp at mail.nih.gov> wrote:
> 
> 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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