11787 Kernel needs to be built with retpolines
11788 Kernel needs to generally use RSB stuffing
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: John Levon <john.levon@joyent.com>

*** 247,256 ****
--- 247,266 ----
  #
  CFLAGS_uts_i386 += -_gcc7=-fno-shrink-wrap
  CFLAGS_uts_i386 += -_gcc8=-fno-shrink-wrap
  CFLAGS_uts_i386 += -_gcc9=-fno-shrink-wrap
  
+ #
+ # retpoline support
+ #
+ CFLAGS_uts_i386 += -_gcc7=-mindirect-branch=thunk-extern
+ CFLAGS_uts_i386 += -_gcc7=-mindirect-branch-register
+ CFLAGS_uts_i386 += -_gcc8=-mindirect-branch=thunk-extern
+ CFLAGS_uts_i386 += -_gcc8=-mindirect-branch-register
+ CFLAGS_uts_i386 += -_gcc9=-mindirect-branch=thunk-extern
+ CFLAGS_uts_i386 += -_gcc9=-mindirect-branch-register
+ 
  CSTD = $(CSTD_GNU99)
  
  CFLAGS_uts              =
  CFLAGS_uts              += $(STAND_FLAGS_$(CLASS))
  CFLAGS_uts              += $(CCVERBOSE)