[Debian-science-sagemath] Sagemath Build-Depends backported - unfortunately build error (Was: Help needed to backport ipywidgets ... (Was: Backporting sagemath))

[Andreas Tille]

Hi Tobias,

On Wed, Apr 12, 2017 at 08:59:06AM +0100, Tobias Hansen wrote:
> > This check does not find the header for some reason:
> > 
> > checking fplll/fplll.h usability... no
> > checking fplll/fplll.h presence... no
> > checking for fplll/fplll.h... no
> > 
> > However the file exists in the backported libfplll-dev package. Not sure
> > yet what's the problem.
> 
> You should be able to see what's happening in debian/pruner/config.log.

This log says:

In file included from conftest.cpp:52:0:
/usr/include/fplll/fplll.h:22:2: error: #error fplll needs at least a C++11 compliant compiler
 #error fplll needs at least a C++11 compliant compiler
  ^
In file included from /usr/include/c++/4.9/array:35:0,
                 from /usr/include/fplll/enum/enumerate.h:21,
                 from /usr/include/fplll/bkz.h:23,
                 from /usr/include/fplll/fplll.h:28,
                 from conftest.cpp:52:
/usr/include/c++/4.9/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
 #error This file requires compiler and library support for the \
  ^
In file included from /usr/include/fplll/nr/nr.h:17:0,
                 from /usr/include/fplll/nr/numvect.h:19,
                 from /usr/include/fplll/nr/matrix.h:21,
                 from /usr/include/fplll/util.h:23,
                 from /usr/include/fplll/fplll.h:25,
                 from conftest.cpp:52:
/usr/include/fplll/nr/nr_FP.inl:326:35: error: expected unqualified-id before '&&' token
 template <class F> inline FP_NR<F>&& operator+(FP_NR<F> &&a, const FP_NR<F> &b)
                                   ^
/usr/include/fplll/nr/nr_FP.inl:413:35: error: expected unqualified-id before '&&' token
 template <class F> inline FP_NR<F>&& operator*(FP_NR<F> &&a, const FP_NR<F> &b) {
                                   ^
...


Do I need to backport even a compiler since the issue seems to be
triggered by[1]

...
 #if __cplusplus < 201103L
 #error fplll needs at least a C++11 compliant compiler
 #endif
...


Any ideas?

Kind regards

       Andreas.

[1] https://fplll.github.io/fplll/fplll_8h_source.html


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