Now I think it is related to the LinBox header but I don't know enough to
understand the hint given by leif in this post
<https://groups.google.com/d/msg/sage-release/h-Sk_2q8YSg/gKV3HBymBgAJ>:
"So far I've successfully built Sage 7.2 with GCC 6.1 and the above
changes, except for some Sage library modules which include LinBox
headers, and hence have to be built with '-std=gnu++98', too."
How do I build those headers with '-std=gnu++98'?
On Monday, June 27, 2016 at 6:57:09 AM UTC-7, pong wrote:
>
> I aware of the problem of Singular and set CXXFLAGS to -std=gnu++98. The
> compliation got pass Singular all the way to almost the end, but giving me
> the follow. I'm not even sure which package(s) it is complaning (sagelib?).
> And it doesn't indicate a log file to look at...
> Any help?
>
>
> /home/pong/sage-7.2/src/build/cythonized/sage/matrix/matrix_modn_dense_double.cpp:
>
> In function ‘PyObject*
> __pyx_f_4sage_6matrix_24matrix_modn_dense_double_linbox_charpoly(__pyx_t_4sage_6matrix_24matrix_modn_dense_double_celement,
>
> Py_ssize_t, __pyx_t_4sage_6matrix_24matrix_modn_dense_double_celement*)’:
> /home/pong/sage-7.2/src/build/cythonized/sage/matrix/matrix_modn_dense_double.cpp:5465:35:
>
> warning: comparison between
> signed and unsigned integer expressions [-Wsign-compare]
> for (__pyx_t_7 = 0; __pyx_t_7 < __pyx_t_6; __pyx_t_7+=1) {
> ~~~~~~~~~~^~~~~~~~~~~
> make[2]: *** [Makefile:953: sagelib] Error 2
> make[2]: Leaving directory '/home/pong/sage-7.2/build/make'
> make[1]: *** [Makefile:826: all] Error 2
> make[1]: Leaving directory '/home/pong/sage-7.2/build/make'
>
> real 147m20.451s
> user 140m41.229s
> sys 5m47.893s
> ***************************************************************
> Error building Sage.
>
> The following package(s) may have failed to build (not necessarily
> during this run of 'make all'):
>
> The build directory may contain configuration files and other potentially
> helpful information. WARNING: if you now run 'make' again, the build
> directory will, by default, be deleted. Set the environment variable
> SAGE_KEEP_BUILT_SPKGS to 'yes' to prevent this.
>
> make: *** [Makefile:18: all] Error 1
>
>
>
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