libffi: Add --enable-cet to configure

When --enable-cet is used to configure GCC, enable Intel CET in libffi.

	* Makefile.am (AM_CFLAGS): Add $(CET_FLAGS).
	(AM_CCASFLAGS): Likewise.
	* configure.ac (CET_FLAGS): Add GCC_CET_FLAGS and AC_SUBST.
	* Makefile.in: Regenerate.
	* aclocal.m4: Likewise.
	* configure: Likewise.
	* include/Makefile.in: Likewise.
	* man/Makefile.in: Likewise.
	* testsuite/Makefile.in: Likewise.

8 files changed, 116 insertions, 7 deletions

diff --git a/libffi/Makefile.am b/libffi/Makefile.am
index 02e36176c67..c6d6f849c53 100644
--- a/libffi/Makefile.am
+++ b/libffi/Makefile.am
@@ -182,7 +182,7 @@ nodist_libffi_convenience_la_SOURCES = $(nodist_libffi_la_SOURCES)
 
 LTLDFLAGS = $(shell $(SHELL) $(top_srcdir)/../libtool-ldflags $(LDFLAGS))
 
-AM_CFLAGS = -Wall -g -fexceptions
+AM_CFLAGS = -Wall -g -fexceptions $(CET_FLAGS)
 if FFI_DEBUG
 # Build debug. Define FFI_DEBUG on the commandline so that, when building with
 # MSVC, it can link against the debug CRT.
@@ -218,7 +218,7 @@ libffi_la_LDFLAGS = -no-undefined $(libffi_version_info) $(libffi_version_script
 libffi_la_DEPENDENCIES = $(libffi_la_LIBADD) $(libffi_version_dep)
 
 AM_CPPFLAGS = -I. -I$(top_srcdir)/include -Iinclude -I$(top_srcdir)/src
-AM_CCASFLAGS = $(AM_CPPFLAGS)
+AM_CCASFLAGS = $(AM_CPPFLAGS) $(CET_FLAGS)
 
 # Multilib support.  Automake should provide these on its own.
 all-recursive: all-multi
diff --git a/libffi/Makefile.in b/libffi/Makefile.in
index 6ff0c67a779..5524a6a571e 100644
--- a/libffi/Makefile.in
+++ b/libffi/Makefile.in
@@ -99,7 +99,9 @@ subdir = .
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
 	$(top_srcdir)/../config/asmcfi.m4 \
+	$(top_srcdir)/../config/cet.m4 \
 	$(top_srcdir)/../config/depstand.m4 \
+	$(top_srcdir)/../config/enable.m4 \
 	$(top_srcdir)/../config/lead-dot.m4 \
 	$(top_srcdir)/../config/multi.m4 \
 	$(top_srcdir)/../config/override.m4 \
@@ -320,6 +322,7 @@ CCAS = @CCAS@
 CCASDEPMODE = @CCASDEPMODE@
 CCASFLAGS = @CCASFLAGS@
 CCDEPMODE = @CCDEPMODE@
+CET_FLAGS = @CET_FLAGS@
 CFLAGS = @CFLAGS@
 CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
@@ -586,7 +589,7 @@ libffi_convenience_la_LIBADD = $(libffi_la_LIBADD)
 libffi_convenience_la_DEPENDENCIES = $(libffi_la_DEPENDENCIES)
 nodist_libffi_convenience_la_SOURCES = $(nodist_libffi_la_SOURCES)
 LTLDFLAGS = $(shell $(SHELL) $(top_srcdir)/../libtool-ldflags $(LDFLAGS))
-AM_CFLAGS = -Wall -g -fexceptions $(am__append_2)
+AM_CFLAGS = -Wall -g -fexceptions $(CET_FLAGS) $(am__append_2)
 @LIBFFI_BUILD_VERSIONED_SHLIB_FALSE@libffi_version_script = 
 @LIBFFI_BUILD_VERSIONED_SHLIB_GNU_TRUE@@LIBFFI_BUILD_VERSIONED_SHLIB_TRUE@libffi_version_script = -Wl,--version-script,libffi.map
 @LIBFFI_BUILD_VERSIONED_SHLIB_SUN_TRUE@@LIBFFI_BUILD_VERSIONED_SHLIB_TRUE@libffi_version_script = -Wl,-M,libffi.map-sun
@@ -597,7 +600,7 @@ libffi_version_info = -version-info `grep -v '^\#' $(srcdir)/libtool-version`
 libffi_la_LDFLAGS = -no-undefined $(libffi_version_info) $(libffi_version_script) $(LTLDFLAGS) $(AM_LTLDFLAGS)
 libffi_la_DEPENDENCIES = $(libffi_la_LIBADD) $(libffi_version_dep)
 AM_CPPFLAGS = -I. -I$(top_srcdir)/include -Iinclude -I$(top_srcdir)/src
-AM_CCASFLAGS = $(AM_CPPFLAGS)
+AM_CCASFLAGS = $(AM_CPPFLAGS) $(CET_FLAGS)
 MULTISRCTOP = 
 MULTIBUILDTOP = 
 MULTIDIRS = 
diff --git a/libffi/aclocal.m4 b/libffi/aclocal.m4
index 9c8c88f8ca6..736ec308d5b 100644
--- a/libffi/aclocal.m4
+++ b/libffi/aclocal.m4
@@ -1189,7 +1189,9 @@ AC_SUBST([am__untar])
 
 m4_include([../config/acx.m4])
 m4_include([../config/asmcfi.m4])
+m4_include([../config/cet.m4])
 m4_include([../config/depstand.m4])
+m4_include([../config/enable.m4])
 m4_include([../config/lead-dot.m4])
 m4_include([../config/multi.m4])
 m4_include([../config/override.m4])
diff --git a/libffi/configure b/libffi/configure
index 4bababb87f5..575641cca1d 100755
--- a/libffi/configure
+++ b/libffi/configure
@@ -692,6 +692,7 @@ am__fastdepCCAS_TRUE
 CCASDEPMODE
 CCASFLAGS
 CCAS
+CET_FLAGS
 am__fastdepCXX_FALSE
 am__fastdepCXX_TRUE
 CXXDEPMODE
@@ -802,6 +803,7 @@ enable_multilib
 enable_silent_rules
 enable_generated_files_in_srcdir
 enable_dependency_tracking
+enable_cet
 enable_shared
 enable_static
 with_pic
@@ -1457,6 +1459,7 @@ Optional Features:
                           do not reject slow dependency extractors
   --disable-dependency-tracking
                           speeds up one-time build
+  --enable-cet            enable Intel CET in target libraries [default=auto]
   --enable-shared[=PKGS]  build shared libraries [default=yes]
   --enable-static[=PKGS]  build static libraries [default=yes]
   --enable-fast-install[=PKGS]
@@ -4877,6 +4880,95 @@ CFLAGS=$save_CFLAGS
 
 
 
+# Add CET specific flags if CET is enabled
+
+ # Check whether --enable-cet was given.
+if test "${enable_cet+set}" = set; then :
+  enableval=$enable_cet;
+      case "$enableval" in
+       yes|no|auto) ;;
+       *) as_fn_error $? "Unknown argument to enable/disable cet" "$LINENO" 5 ;;
+                          esac
+
+else
+  enable_cet=auto
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for CET support" >&5
+$as_echo_n "checking for CET support... " >&6; }
+
+# NB: Avoid nested save_CFLAGS and save_LDFLAGS.
+case "$host" in
+  i[34567]86-*-linux* | x86_64-*-linux*)
+    case "$enable_cet" in
+      auto)
+	# Check if target supports multi-byte NOPs
+	# and if compiler and assembler support CET insn.
+	cet_save_CFLAGS="$CFLAGS"
+	CFLAGS="$CFLAGS -fcf-protection"
+	cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+#if !defined(__SSE2__)
+#error target does not support multi-byte NOPs
+#else
+asm ("setssbsy");
+#endif
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  enable_cet=yes
+else
+  enable_cet=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+	CFLAGS="$cet_save_CFLAGS"
+	;;
+      yes)
+	# Check if assembler supports CET.
+	cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+asm ("setssbsy");
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+else
+  as_fn_error $? "assembler with CET support is required for --enable-cet" "$LINENO" 5
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+	;;
+    esac
+    ;;
+  *)
+    enable_cet=no
+    ;;
+esac
+if test x$enable_cet = xyes; then
+  CET_FLAGS="-fcf-protection -mshstk"
+  { $as_echo "$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
+
+
+
 # By default we simply use the C compiler to build assembly code.
 
 test "${CCAS+set}" = set || CCAS=$CC
@@ -6903,7 +6995,6 @@ fi
 
 
 
-
 # Check whether --enable-libtool-lock was given.
 if test "${enable_libtool_lock+set}" = set; then :
   enableval=$enable_libtool_lock;
@@ -11481,7 +11572,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11484 "configure"
+#line 11575 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11587,7 +11678,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11590 "configure"
+#line 11681 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
diff --git a/libffi/configure.ac b/libffi/configure.ac
index bff5a1e7189..014d89d0423 100644
--- a/libffi/configure.ac
+++ b/libffi/configure.ac
@@ -48,6 +48,10 @@ m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
 
 AC_SUBST(CFLAGS)
 
+# Add CET specific flags if CET is enabled
+GCC_CET_FLAGS(CET_FLAGS)
+AC_SUBST(CET_FLAGS)
+
 AM_PROG_AS
 AM_PROG_CC_C_O
 AC_PROG_LIBTOOL
diff --git a/libffi/include/Makefile.in b/libffi/include/Makefile.in
index c76e2a8c6f5..879cb72296d 100644
--- a/libffi/include/Makefile.in
+++ b/libffi/include/Makefile.in
@@ -93,7 +93,9 @@ subdir = include
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
 	$(top_srcdir)/../config/asmcfi.m4 \
+	$(top_srcdir)/../config/cet.m4 \
 	$(top_srcdir)/../config/depstand.m4 \
+	$(top_srcdir)/../config/enable.m4 \
 	$(top_srcdir)/../config/lead-dot.m4 \
 	$(top_srcdir)/../config/multi.m4 \
 	$(top_srcdir)/../config/override.m4 \
@@ -192,6 +194,7 @@ CCAS = @CCAS@
 CCASDEPMODE = @CCASDEPMODE@
 CCASFLAGS = @CCASFLAGS@
 CCDEPMODE = @CCDEPMODE@
+CET_FLAGS = @CET_FLAGS@
 CFLAGS = @CFLAGS@
 CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
diff --git a/libffi/man/Makefile.in b/libffi/man/Makefile.in
index 8dbe52ff5af..9d4f96608c4 100644
--- a/libffi/man/Makefile.in
+++ b/libffi/man/Makefile.in
@@ -92,7 +92,9 @@ subdir = man
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
 	$(top_srcdir)/../config/asmcfi.m4 \
+	$(top_srcdir)/../config/cet.m4 \
 	$(top_srcdir)/../config/depstand.m4 \
+	$(top_srcdir)/../config/enable.m4 \
 	$(top_srcdir)/../config/lead-dot.m4 \
 	$(top_srcdir)/../config/multi.m4 \
 	$(top_srcdir)/../config/override.m4 \
@@ -174,6 +176,7 @@ CCAS = @CCAS@
 CCASDEPMODE = @CCASDEPMODE@
 CCASFLAGS = @CCASFLAGS@
 CCDEPMODE = @CCDEPMODE@
+CET_FLAGS = @CET_FLAGS@
 CFLAGS = @CFLAGS@
 CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
diff --git a/libffi/testsuite/Makefile.in b/libffi/testsuite/Makefile.in
index 3e9e937b752..a19b523e54a 100644
--- a/libffi/testsuite/Makefile.in
+++ b/libffi/testsuite/Makefile.in
@@ -92,7 +92,9 @@ subdir = testsuite
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
 	$(top_srcdir)/../config/asmcfi.m4 \
+	$(top_srcdir)/../config/cet.m4 \
 	$(top_srcdir)/../config/depstand.m4 \
+	$(top_srcdir)/../config/enable.m4 \
 	$(top_srcdir)/../config/lead-dot.m4 \
 	$(top_srcdir)/../config/multi.m4 \
 	$(top_srcdir)/../config/override.m4 \
@@ -147,6 +149,7 @@ CCAS = @CCAS@
 CCASDEPMODE = @CCASDEPMODE@
 CCASFLAGS = @CCASFLAGS@
 CCDEPMODE = @CCDEPMODE@
+CET_FLAGS = @CET_FLAGS@
 CFLAGS = @CFLAGS@
 CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@