cet.m4 revision 1.1.1.2
1dnl 2dnl GCC_CET_FLAGS 3dnl (SHELL-CODE_HANDLER) 4dnl 5AC_DEFUN([GCC_CET_FLAGS],[dnl 6GCC_ENABLE(cet, no, ,[enable Intel CET in target libraries], 7 permit yes|no|auto) 8AC_MSG_CHECKING([for CET support]) 9 10case "$host" in 11 i[[34567]]86-*-linux* | x86_64-*-linux*) 12 case "$enable_cet" in 13 auto) 14 # Check if target supports multi-byte NOPs 15 # and if assembler supports CET insn. 16 AC_COMPILE_IFELSE( 17 [AC_LANG_PROGRAM( 18 [], 19 [ 20#if !defined(__SSE2__) 21#error target does not support multi-byte NOPs 22#else 23asm ("setssbsy"); 24#endif 25 ])], 26 [enable_cet=yes], 27 [enable_cet=no]) 28 ;; 29 yes) 30 # Check if assembler supports CET. 31 AC_COMPILE_IFELSE( 32 [AC_LANG_PROGRAM( 33 [], 34 [asm ("setssbsy");])], 35 [], 36 [AC_MSG_ERROR([assembler with CET support is required for --enable-cet])]) 37 ;; 38 esac 39 ;; 40 *) 41 enable_cet=no 42 ;; 43esac 44if test x$enable_cet = xyes; then 45 $1="-fcf-protection -mshstk" 46 AC_MSG_RESULT([yes]) 47else 48 AC_MSG_RESULT([no]) 49fi 50]) 51