[MacPorts] #70278: chez-scheme fails on 10.10 and earlier

[MacPorts]

#70278: chez-scheme fails on 10.10 and earlier
-------------------------+-------------------------------------------------
  Reporter:              |      Owner:  mohd-akram
  barracuda156           |
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.9.3
Resolution:              |   Keywords:  yosemite, mavericks, mountainlion,
      Port:  chez-       |  lion, snowleopard
  scheme                 |
-------------------------+-------------------------------------------------

Comment (by ryandesign):

 I reran the buildbot builds and the error is:

 {{{
 c/pb.c:122:10: error: use of unknown builtin '__builtin_add_overflow'
 [-Wimplicit-function-declaration]
     case COMMON_INSTR(pb_bin_op_pb_signal_pb_add_pb_register)
          ^
 c/pb.c:51:28: note: expanded from macro 'COMMON_INSTR'
 #define COMMON_INSTR(x) x: doi_ ## x(instr); break;
                            ^
 <scratch space>:73:1: note: expanded from here
 doi_pb_bin_op_pb_signal_pb_add_pb_register
 ^
 c/pb.h:384:4: note: expanded from macro
 'doi_pb_bin_op_pb_signal_pb_add_pb_register'
    do_pb_bin_op_pb_signal_pb_add_pb_register(INSTR_drr_dest(instr),
 INSTR_drr_reg1(instr), INSTR_drr_reg2(instr))
    ^
 c/pb.h:390:12: note: expanded from macro
 'do_pb_bin_op_pb_signal_pb_add_pb_register'
     flag = __builtin_add_overflow(a, b, &r);                         \
            ^
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/70278#comment:1>
MacPorts <https://www.macports.org/>
Ports system for macOS