config/cet.m4

   1 dnl
   2 dnl GCC_CET_FLAGS
   3 dnl    (SHELL-CODE_HANDLER)
   4 dnl
   5 AC_DEFUN([GCC_CET_FLAGS],[dnl
   6 GCC_ENABLE(cet, default, ,[enable Intel CET in target libraries],
   7            permit yes|no|default)
   8 case "$host" in
   9   i[[34567]]86-*-linux* | x86_64-*-linux*)
  10     case "$enable_cet" in
  11       default)
  12         # Check if assembler supports CET.
  13         AC_COMPILE_IFELSE(
  14          [AC_LANG_PROGRAM(
  15           [],
  16           [asm ("setssbsy");])],
  17          [enable_cet=yes],
  18          [enable_cet=no])
  19         ;;
  20       yes)
  21         # Check if assembler supports CET.
  22         AC_COMPILE_IFELSE(
  23          [AC_LANG_PROGRAM(
  24           [],
  25           [asm ("setssbsy");])],
  26          [],
  27          [AC_MSG_ERROR([assembler with CET support is required for --enable-cet])])
  28         ;;
  29     esac
  30     ;;
  31   *)
  32     enable_cet=no
  33     ;;
  34 esac
  35 if test x$enable_cet = xyes; then
  36   $1="-fcf-protection -mcet"
  37 fi
  38 ])