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annotate config/cet.m4 @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
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131
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1 dnl
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2 dnl GCC_CET_FLAGS
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3 dnl (SHELL-CODE_HANDLER)
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4 dnl
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5 AC_DEFUN([GCC_CET_FLAGS],[dnl
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6 GCC_ENABLE(cet, no, ,[enable Intel CET in target libraries],
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7 permit yes|no|auto)
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8 AC_MSG_CHECKING([for CET support])
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9
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10 case "$host" in
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11 i[[34567]]86-*-linux* | x86_64-*-linux*)
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12 case "$enable_cet" in
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13 auto)
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14 # Check if target supports multi-byte NOPs
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15 # and if assembler supports CET insn.
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16 AC_COMPILE_IFELSE(
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17 [AC_LANG_PROGRAM(
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18 [],
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19 [
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20 #if !defined(__SSE2__)
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21 #error target does not support multi-byte NOPs
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22 #else
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23 asm ("setssbsy");
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24 #endif
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25 ])],
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26 [enable_cet=yes],
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27 [enable_cet=no])
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28 ;;
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29 yes)
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30 # Check if assembler supports CET.
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31 AC_COMPILE_IFELSE(
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32 [AC_LANG_PROGRAM(
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33 [],
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34 [asm ("setssbsy");])],
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35 [],
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36 [AC_MSG_ERROR([assembler with CET support is required for --enable-cet])])
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37 ;;
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38 esac
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39 ;;
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40 *)
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41 enable_cet=no
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42 ;;
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43 esac
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44 if test x$enable_cet = xyes; then
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45 $1="-fcf-protection -mshstk"
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46 AC_MSG_RESULT([yes])
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47 else
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48 AC_MSG_RESULT([no])
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49 fi
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50 ])