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authorIgor Tsimbalist <igor.v.tsimbalist@intel.com>2018-02-19 17:25:49 +0100
committerIgor Tsimbalist <itsimbal@gcc.gnu.org>2018-02-19 17:25:49 +0100
commit14e335edc8c5c2cd18779e4e242a3d81037b8b43 (patch)
tree5439816d0ec4a7a72c403e59851b0b78e2d23c88 /libstdc++-v3/configure
parent65e3761d451229338a22226e154cb7d0bed5fcd1 (diff)
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CET shouldn't be enabled in 32-bit run-time libraries by defualt
ENDBR32 and RDSSPD are multi-byte NOPs on x86-64 processors and newer x86 processors, starting Pentium Pro. They are UD on older 32-bit processors. Detect this at configure time and adjust the default value for enable_cet. GCC will enable CET in 32-bit run-time libraries in any case if --enable-cet is used to configure GCC. PR target/84148 * config/cet.m4: Check if target support multi-byte NOPS (SSE). * libatomic/configure: Regenerate. * libbacktrace/configure: Likewise. * libgcc/configure: Likewise. * libgfortran/configure: Likewise. * libgomp/configure: Likewise. * libitm/configure: Likewise. * libmpx/configure: Likewise. * libobjc/configure: Likewise. * libquadmath/configure: Likewise. * libsanitizer/configure: Likewise. * libssp/configure: Likewise. * libstdc++-v3/configure: Likewise. * libvtv/configure: Likewise. From-SVN: r257809
Diffstat (limited to 'libstdc++-v3/configure')
-rwxr-xr-xlibstdc++-v3/configure17
1 files changed, 16 insertions, 1 deletions
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index fb3bf67..54dd7ce 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -81129,18 +81129,28 @@ else
fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for CET support" >&5
+$as_echo_n "checking for CET support... " >&6; }
+
case "$host" in
i[34567]86-*-linux* | x86_64-*-linux*)
case "$enable_cet" in
default)
- # Check if assembler supports CET.
+ # Check if target supports multi-byte NOPs
+ # and if assembler supports CET insn.
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int
main ()
{
+
+#if !defined(__SSE2__)
+#error target does not support multi-byte NOPs
+#else
asm ("setssbsy");
+#endif
+
;
return 0;
}
@@ -81180,6 +81190,11 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
esac
if test x$enable_cet = xyes; then
CET_FLAGS="-fcf-protection -mcet"
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+else
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
fi
EXTRA_CXX_FLAGS="$EXTRA_CXX_FLAGS $CET_FLAGS"