vxl: build fails for 10.7: error: no matching function for call to 'isfinite'

[barracuda156]

I/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_devel_vxl/vxl/work/build/core/vil -pipe -Os -DNDEBUG -I/opt/local/include -stdlib=libc++  -arch x86_64 -mmacosx-version-min=10.7 -fPIC -std=c++11 -MD -MT core/vil/CMakeFiles/vil.dir/vil_new.cxx.o -MF CMakeFiles/vil.dir/vil_new.cxx.o.d -o CMakeFiles/vil.dir/vil_new.cxx.o -c /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_devel_vxl/vxl/work/vxl-3.5.0/core/vil/vil_new.cxx
In file included from /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_devel_vxl/vxl/work/vxl-3.5.0/core/vnl/Templates/vnl_matrix+char-.cxx:1:
In file included from /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_devel_vxl/vxl/work/vxl-3.5.0/core/vnl/vnl_matrix.hxx:94:
/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_devel_vxl/vxl/work/vxl-3.5.0/core/vnl/vnl_math.h:203:48: error: no matching function for call to 'isfinite'
  inline bool isfinite(TArg arg) { return bool(std::isfinite(arg)); }
                                               ^~~~~~~~~~~~~
/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_devel_vxl/vxl/work/vxl-3.5.0/core/vnl/vnl_matrix.hxx:1176:12: note: in instantiation of function template specialization 'vnl_math::isfinite<char>' requested here
      if (!vnl_math::isfinite((*this)(i,j)))
           ^
/usr/bin/../lib/c++/v1/cmath:375:25: note: candidate template ignored: disabled by 'enable_if' [with _A1 = char]
typename std::enable_if<std::is_floating_point<_A1>::value, bool>::type
                        ^
In file included from /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_devel_vxl/vxl/work/vxl-3.5.0/core/vnl/Templates/vnl_matrix+char-.cxx:1:
In file included from /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_devel_vxl/vxl/work/vxl-3.5.0/core/vnl/vnl_matrix.hxx:94:
/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_devel_vxl/vxl/work/vxl-3.5.0/core/vnl/vnl_math.h:201:45: error: no matching function for call to 'isnan'
  inline bool isnan(TArg arg) { return bool(std::isnan(arg)); }
                                            ^~~~~~~~~~
/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_devel_vxl/vxl/work/vxl-3.5.0/core/vnl/vnl_matrix.hxx:1164:11: note: in instantiation of function template specialization 'vnl_math::isnan<char>' requested here
      if (vnl_math::isnan((*this)(i,j)))
          ^
/usr/bin/../lib/c++/v1/cmath:423:25: note: candidate template ignored: disabled by 'enable_if' [with _A1 = char]
typename std::enable_if<std::is_floating_point<_A1>::value, bool>::type
                        ^

[Christopher Nielsen <mascguy@…>]

In 451875f89451e839ceb71246ca61d14c5dc527ba/macports-ports (master):

vxl: request cxx 2011 compiler

Fixes: #68237
See: ​https://github.com/macports/macports-ports/pull/20231