diff options
Diffstat (limited to 'config/cet.m4')
| -rw-r--r-- | config/cet.m4 | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/config/cet.m4 b/config/cet.m4 index 715f4bded19..23dd1f7d27d 100644 --- a/config/cet.m4 +++ b/config/cet.m4 @@ -5,15 +5,24 @@ dnl AC_DEFUN([GCC_CET_FLAGS],[dnl GCC_ENABLE(cet, default, ,[enable Intel CET in target libraries], permit yes|no|default) +AC_MSG_CHECKING([for CET support]) + case "$host" in i[[34567]]86-*-linux* | x86_64-*-linux*) case "$enable_cet" in default) - # Check if assembler supports CET. + # Check if target supports multi-byte NOPs + # and if assembler supports CET insn. AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [], - [asm ("setssbsy");])], + [ +#if !defined(__SSE2__) +#error target does not support multi-byte NOPs +#else +asm ("setssbsy"); +#endif + ])], [enable_cet=yes], [enable_cet=no]) ;; @@ -34,5 +43,8 @@ case "$host" in esac if test x$enable_cet = xyes; then $1="-fcf-protection -mcet" + AC_MSG_RESULT([yes]) +else + AC_MSG_RESULT([no]) fi ]) |