Re: failuers when building ncurses-6.1 on pkgsrc_2019Q4

[Zhiwen Zheng <zhiwen%40701.xyz@localhost>]

The root cause is in my distribution, I am using an old version which does not have the necessary C++ function exposed.

The configure's check for g++ failed, but didn't stop there and keep going with CXX set to "".
==================================



configure:2915: g++ -c -O2 -D_FORTIFY_SOURCE=2  conftest.cc >&5
In file included from /opt/tools/gcc7/include/c++/stdlib.h:36:0,
                 from configure:2903:
/opt/tools/gcc7/include/c++/cstdlib:137:11: error: '::at_quick_exit' has not been declared
   using ::at_quick_exit;
           ^~~~~~~~~~~~~
/opt/tools/gcc7/include/c++/cstdlib:160:11: error: '::quick_exit' has not been declared
   using ::quick_exit;
           ^~~~~~~~~~
configure:2918: $? = 1
configure: failed program was:
#line 2902 "configure"
#include "confdefs.h"
#include <stdlib.h>

int
main (void)
{
exit (42);
  ;
  return 0;
}
configure:2915: g++ -c -O2 -D_FORTIFY_SOURCE=2  conftest.cc >&5
In file included from /opt/tools/gcc7/include/c++/stdlib.h:36:0,
                 from configure:2903:
/opt/tools/gcc7/include/c++/cstdlib:137:11: error: '::at_quick_exit' has not been declared
   using ::at_quick_exit;
           ^~~~~~~~~~~~~
/opt/tools/gcc7/include/c++/cstdlib:160:11: error: '::quick_exit' has not been declared
   using ::quick_exit;
           ^~~~~~~~~~
configure:2918: $? = 1
configure: failed program was: