We have access to SPARC T4 system

SunOS xenos-sagetest 5.11 11.3 sun4v sparc sun4v

We track here the resulting issues and tickets.

• no need to pre-build any tools, apparently. Everything is available via Solaris pkg or pkgutil (i.e. opencsw).

• MPFR configure fails with MPIR. Can be resolved by using GMP instead. Upstream: issue 242. For details and a possible fix, see enable MPIR on Solaris #24674.

• Various packages need CFLAGS="-D_XPG6"

• To take care of the above, set the following before building

export PATH=/opt/csw/gnu:$PATH
export CFLAGS="-O2 -g -D_XPG6"
export CXXFLAGS="$CFLAGS"        # Maybe not strictly needed

./configure --with-mp=gmp

• OpenBLAS fails to auto-detect SPARC CPU: Fix OpenBLAS build on SPARC #24638

• Properly set LD_LIBRARY_PATH in spkg-build for python2/3 on SunOS #24597 fixes building issues for python2/3

• building fplll and singular fails due to a silly C++ (g++ 5.4.0)
  error, which cannot properly compile templated pow() from
  cmath, e.g. the following fails:

#include <cmath>
int main()
{
int i,j,k;
i = 2;
j = 10;
k = pow(i,j);
return k;
}

This appears to be platform-specific. Same error with g++ 7.2.0. Adding std:: to pow, or adding using namespace std; results in successful compilation of this example (and most probably this also will work for Singular).
** this problem went away by itself after some changes to the linker used, I don't really know why **

• iconv fails due to a wrong assumption on the standard in the
  source code, fixed in the latest stable version. upgrade iconv to 1.15 #24602 is the
  update to do here.

• gcc 7.2 builds fplll, whereas gcc 5.4 cannot do it. See fplll fails to build on SunOS #24618

• linking of Singular is tentatively fixed by Singular fails to build on SunOS #24611

Depends on #23733
Depends on #24638
Depends on #24765

CC: @dimpase

Component: porting: Solaris

Branch/Commit: u/jdemeyer/port_sage_to_sparc_solaris_11 @ 760cfbb

Reviewer: Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/24596