Enable building libgfortran with Intel CET

libgfortran/
	* acinclude.m4: Add enable.m4, cet.m4.
	* Makefile.in: Regenerate.
	* configure: Likewise.
	* configure.ac: Set CET_FLAGS. Update AM_FCFLAGS,
	AM_CFLAGS, CFLAGS.

From-SVN: r254902

libgfortran/ChangeLog

+2017-11-17  Igor Tsimbalist  <igor.v.tsimbalist@intel.com>
+
+	* acinclude.m4: Add enable.m4, cet.m4.
+	* Makefile.in: Regenerate.
+	* configure: Likewise.
+	* configure.ac: Set CET_FLAGS. Update AM_FCFLAGS,
+	AM_CFLAGS, CFLAGS.
+
 2017-10-27  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 	    Rimvydas (RJ)
 

libgfortran/Makefile.in

@@ -139,7 +139,9 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/depstand.m4 \
 	$(top_srcdir)/../config/no-executables.m4 \
 	$(top_srcdir)/../config/math.m4 \
 	$(top_srcdir)/../config/ax_check_define.m4 \
-	$(top_srcdir)/../libtool.m4 $(top_srcdir)/configure.ac
+	$(top_srcdir)/../config/enable.m4 \
+	$(top_srcdir)/../config/cet.m4 $(top_srcdir)/../libtool.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 \

libgfortran/acinclude.m4

@@ -2,6 +2,8 @@ m4_include(../config/acx.m4)
 m4_include(../config/no-executables.m4)
 m4_include(../config/math.m4)
 m4_include(../config/ax_check_define.m4)
+m4_include(../config/enable.m4)
+m4_include(../config/cet.m4)
 
 dnl Check that we have a working GNU Fortran compiler
 AC_DEFUN([LIBGFOR_WORKING_GFORTRAN], [

libgfortran/configure

@@ -773,6 +773,7 @@ enable_intermodule
 enable_maintainer_mode
 enable_multilib
 enable_dependency_tracking
+enable_cet
 enable_symvers
 with_gnu_ld
 enable_shared
@@ -1424,6 +1425,8 @@ Optional Features:
   --enable-multilib       build many library versions (default)
   --disable-dependency-tracking  speeds up one-time build
   --enable-dependency-tracking   do not reject slow dependency extractors
+  --enable-cet            enable Intel CET in target libraries
+                          [default=default]
   --disable-symvers       disable symbol versioning for libgfortran
   --enable-shared[=PKGS]  build shared libraries [default=yes]
   --enable-static[=PKGS]  build static libraries [default=yes]
@@ -5787,6 +5790,78 @@ if test "x$GCC" = "xyes"; then
   CFLAGS="-std=gnu11 $CFLAGS"
 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
+
+AM_FCFLAGS="$AM_FCFLAGS $CET_FLAGS"
+AM_CFLAGS="$AM_CFLAGS $CET_FLAGS"
+CFLAGS="$CFLAGS $CET_FLAGS"
+
+
 
 
 
@@ -12423,7 +12498,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12426 "configure"
+#line 12501 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12529,7 +12604,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12532 "configure"
+#line 12607 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H

libgfortran/configure.ac

@@ -147,6 +147,13 @@ if test "x$GCC" = "xyes"; then
   ## that we'll encounter when compiling our own source files.
   CFLAGS="-std=gnu11 $CFLAGS"
 fi
+
+# Add CET specific flags if CET is enabled
+GCC_CET_FLAGS(CET_FLAGS)
+AM_FCFLAGS="$AM_FCFLAGS $CET_FLAGS"
+AM_CFLAGS="$AM_CFLAGS $CET_FLAGS"
+CFLAGS="$CFLAGS $CET_FLAGS"
+
 AC_SUBST(AM_FCFLAGS)
 AC_SUBST(AM_CFLAGS)
 AC_SUBST(CFLAGS)