Enable building libatomic with Intel CET

libatomic/
	* configure.ac: Set CET_FLAGS, update XCFLAGS.
	* acinclude.m4: Add cet.m4 and enable.m4.
	* configure: Regenerate.
	* Makefile.in: Likewise.
	* testsuite/Makefile.in: Likewise.

From-SVN: r254893

libatomic/ChangeLog

+2017-11-17  Igor Tsimbalist  <igor.v.tsimbalist@intel.com>
+
+	* configure.ac: Set CET_FLAGS, update XCFLAGS.
+	* acinclude.m4: Add cet.m4 and enable.m4.
+	* configure: Regenerate.
+	* Makefile.in: Likewise.
+	* testsuite/Makefile.in: Likewise.
+
 2017-10-20  Richard Earnshaw  <rearnsha@arm.com>
 
 	* Makefile.am: (IFUNC_OPTIONS): Set the architecture to

libatomic/Makefile.in

@@ -75,7 +75,8 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
 	$(top_srcdir)/../ltoptions.m4 $(top_srcdir)/../ltsugar.m4 \
 	$(top_srcdir)/../ltversion.m4 $(top_srcdir)/../lt~obsolete.m4 \
 	$(top_srcdir)/acinclude.m4 $(top_srcdir)/../libtool.m4 \
-	$(top_srcdir)/configure.ac
+	$(top_srcdir)/../config/enable.m4 \
+	$(top_srcdir)/../config/cet.m4 $(top_srcdir)/configure.ac
 am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 	$(ACLOCAL_M4)
 am__CONFIG_DISTCLEAN_FILES = config.status config.cache config.log \

libatomic/acinclude.m4

@@ -632,6 +632,8 @@ AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)
 
 dnl ----------------------------------------------------------------------
 sinclude(../libtool.m4)
+sinclude(../config/enable.m4)
+sinclude(../config/cet.m4)
 dnl The lines below arrange for aclocal not to bring an installed
 dnl libtool.m4 into aclocal.m4, while still arranging for automake to
 dnl add a definition of LIBTOOL to Makefile.in.

libatomic/configure

@@ -764,6 +764,7 @@ with_gnu_ld
 enable_libtool_lock
 enable_maintainer_mode
 enable_symvers
+enable_cet
 with_gcc_major_version_only
 '
       ac_precious_vars='build_alias
@@ -1410,6 +1411,8 @@ Optional Features:
 			  (and sometimes confusing) to the casual installer
   --enable-symvers=STYLE  enables symbol versioning of the shared library
                           [default=yes]
+  --enable-cet            enable Intel CET in target libraries
+                          [default=default]
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -11115,7 +11118,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11118 "configure"
+#line 11121 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11221,7 +11224,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11224 "configure"
+#line 11227 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -15225,6 +15228,75 @@ if test "x$GCC" = "xyes"; then
   XCFLAGS="$XCFLAGS -Wall -Werror"
 fi
 
+# 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 "$enableval" in
+       yes|no|default) ;;
+       *) as_fn_error "Unknown argument to enable/disable cet" "$LINENO" 5 ;;
+                          esac
+
+else
+  enable_cet=default
+fi
+
+
+case "$host" in
+  i[34567]86-*-linux* | x86_64-*-linux*)
+    case "$enable_cet" in
+      default)
+	# 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 :
+  enable_cet=yes
+else
+  enable_cet=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+	;;
+      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 -mcet"
+fi
+
+XCFLAGS="$XCFLAGS $CET_FLAGS"
+
 XCFLAGS="$XCFLAGS $XPCFLAGS"
 
 

libatomic/configure.ac

@@ -238,6 +238,10 @@ if test "x$GCC" = "xyes"; then
   XCFLAGS="$XCFLAGS -Wall -Werror"
 fi
 
+# Add CET specific flags if CET is enabled
+GCC_CET_FLAGS(CET_FLAGS)
+XCFLAGS="$XCFLAGS $CET_FLAGS"
+
 XCFLAGS="$XCFLAGS $XPCFLAGS"
 
 AC_SUBST(config_path)

libatomic/testsuite/Makefile.in

@@ -64,7 +64,8 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
 	$(top_srcdir)/../ltoptions.m4 $(top_srcdir)/../ltsugar.m4 \
 	$(top_srcdir)/../ltversion.m4 $(top_srcdir)/../lt~obsolete.m4 \
 	$(top_srcdir)/acinclude.m4 $(top_srcdir)/../libtool.m4 \
-	$(top_srcdir)/configure.ac
+	$(top_srcdir)/../config/enable.m4 \
+	$(top_srcdir)/../config/cet.m4 $(top_srcdir)/configure.ac
 am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 	$(ACLOCAL_M4)
 mkinstalldirs = $(SHELL) $(top_srcdir)/../mkinstalldirs