07:16 tobik 

lang/cint: Unbreak build with GCC 9

G__cpp_list.cxx: In function 'int G__list_49_0_10(G__value*, const char*,
G__param*, int)':
G__cpp_list.cxx:707:109: error: 'std::__cxx11::list<int, std::allocator<int>
>::iterator' {aka 'struct std::_List_iterator<int>'} has no member named
'operator=='; did you mean 'operator='?
  707 |       G__letint(result7, 103, (long) ((list<int,allocator<int>
>::iterator*) G__getstructoffset())->operator==(*(list<int,allocator<int>
>::iterator*) libp->para[0].ref));
      |                                                                         
                                   ^~
      |                                                                         
                                   operator=
G__cpp_list.cxx: In function 'int G__list_49_0_11(G__value*, const char*,
G__param*, int)':
G__cpp_list.cxx:713:109: error: 'std::__cxx11::list<int, std::allocator<int>
>::iterator' {aka 'struct std::_List_iterator<int>'} has no member named
'operator!='; did you mean 'operator='?
  713 |       G__letint(result7, 103, (long) ((list<int,allocator<int>
>::iterator*) G__getstructoffset())->operator!=(*(list<int,allocator<int>
>::iterator*) libp->para[0].ref));
      |                                                                         
                                   ^~
      |                                                                         
                                   operator=

http://pb2.nyi.freebsd.org/data/120i386-default-PR238330/2019-06-09_20h27m22s/logs/errors/cint-5.18.00_12.log

While here make the build abort fast on build errors instead of
carrying on like nothing happened.

PR:		238907
Reported by:	antoine (via exp-run in PR 238330)