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spectre support for clang compiler

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netblue30 2018-03-30 08:19:33 -04:00
parent 34771dde86
commit 4a99c8aa2c
1 changed files with 8 additions and 2 deletions
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10
configure.ac
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@ -9,15 +9,21 @@ AC_PROG_INSTALL
AC_PROG_RANLIB
HAVE_SPECTRE="no"
AC_MSG_CHECKING(for Spectre mitigation support in gcc compiler)
AC_MSG_CHECKING(for Spectre mitigation support in gcc or clang compiler)
AS_IF([test "$CC" = "gcc"], [
HAVE_SPECTRE="yes"
$CC -mindirect-branch=thunk -c dummy.c || HAVE_SPECTRE="no"
rm -f dummy.o
EXTRA_CFLAGS+=" -mindirect-branch=thunk "
])
AS_IF([test "$CC" = "clang"], [
HAVE_SPECTRE="yes"
$CC -mretpoline -c dummy.c || HAVE_SPECTRE="no"
rm -f dummy.o
EXTRA_CFLAGS+=" -mretpoline "
])
AS_IF([test "$HAVE_SPECTRE" = "yes"], [
AC_MSG_RESULT(yes)
EXTRA_CFLAGS+=" -mindirect-branch=thunk "
])
AS_IF([test "$HAVE_SPECTRE" = "no"], [
AC_MSG_RESULT(... not available)