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

1 files changed, 77 insertions, 2 deletions

diff --git a/libgfortran/configure b/libgfortran/configure
index 87c83ca..60e18a7 100755
--- a/libgfortran/configure
+++ b/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