Found the following significant warnings:
  gen_code_util.c:218:1: warning: control reaches end of non-void function [-Wreturn-type]
  ptr_table.c:237:1: warning: control reaches end of non-void function [-Wreturn-type]
  ptr_table.c:244:1: warning: control reaches end of non-void function [-Wreturn-type]
  ptr_table.c:309:1: warning: control reaches end of non-void function [-Wreturn-type]
  ptr_table.c:315:1: warning: control reaches end of non-void function [-Wreturn-type]
  ptr_table.c:322:1: warning: control reaches end of non-void function [-Wreturn-type]
  ptr_table.c:397:1: warning: control reaches end of non-void function [-Wreturn-type]
  ptr_table.c:410:1: warning: control reaches end of non-void function [-Wreturn-type]
  sailr.c:101:1: warning: control reaches end of non-void function [-Wreturn-type]
  var_hash.c:111:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm.c:62:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_assign.c:200:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_assign.c:219:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_assign.c:228:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_assign.c:234:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_call_func.c:48:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_code.c:51:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_rexp.c:66:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_stack.c:126:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_stack.c:139:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_stack.c:152:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_stack.c:164:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_stack.c:174:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_stack.c:186:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_stack.c:197:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_stack.c:217:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_stack.c:235:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_stack.c:307:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_stack.c:437:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/vm_stack.c:472:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/func/c_func/c_func_helper.h:109:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/func/c_func/c_func_helper.h:135:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/func/c_func/c_func_helper.h:328:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/func/c_func/c_func.c:170:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/func/c_func/c_func.c:176:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/func/c_func/c_func.c:182:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/func/c_func/c_func.c:311:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/func/c_func/c_func.c:365:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/func/c_func/c_func.c:393:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/func/c_func/c_func.c:414:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/func/c_func/c_func.c:421:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/func/c_func/c_func.c:427:1: warning: control reaches end of non-void function [-Wreturn-type]
  vm/func/c_func/c_func.c:433:1: warning: control reaches end of non-void function [-Wreturn-type]
Found the following additional notes/warnings:
  gen_code.c:124:1: warning: control may reach end of non-void function [-Wreturn-type]
  gen_code.c:353:1: warning: control may reach end of non-void function [-Wreturn-type]
  ptr_table.c:471:1: warning: control may reach end of non-void function [-Wreturn-type]
See ‘/Volumes/SSD-Data/Builds/R-dev-web/QA/Simon/packages/el-capitan-x86_64/results/3.6/datasailr.Rcheck/00install.out’ for details.