3 files changed, 40 insertions, 1 deletions
diff --git a/libgcc/Makefile.in b/libgcc/Makefile.in
index d8163c5..3f77283 100644
--- a/libgcc/Makefile.in
+++ b/libgcc/Makefile.in
@@ -434,7 +434,7 @@ LIB2ADD += enable-execute-stack.c
 LIB2ADD += $(srcdir)/hardcfr.c
 
 # Stack scrubbing infrastructure.
-LIB2ADD += $(srcdir)/strub.c
+@HAVE_STRUB_SUPPORT@LIB2ADD += $(srcdir)/strub.c
 
 # While emutls.c has nothing to do with EH, it is in LIB2ADDEH*
 # instead of LIB2ADD because that's the way to be sure on some targets
diff --git a/libgcc/configure b/libgcc/configure
index cf14920..5671589 100755
--- a/libgcc/configure
+++ b/libgcc/configure
@@ -593,6 +593,7 @@ asm_hidden_op
 extra_parts
 cpu_type
 get_gcc_base_ver
+HAVE_STRUB_SUPPORT
 thread_header
 tm_defines
 tm_file
@@ -5702,6 +5703,31 @@ esac
 
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for strub support" >&5
+$as_echo_n "checking for strub support... " >&6; }
+if ${libgcc_cv_strub_support+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+void __attribute__ ((__strub__)) fn (void) {}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libgcc_cv_strub_support=yes
+else
+  libgcc_cv_strub_support=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgcc_cv_strub_support" >&5
+$as_echo "$libgcc_cv_strub_support" >&6; }
+if test "x$libgcc_cv_strub_support" != xno; then
+  HAVE_STRUB_SUPPORT=
+else
+  HAVE_STRUB_SUPPORT='# '
+fi
+
+
 # Determine what GCC version number to use in filesystem paths.
 
   get_gcc_base_ver="cat"
diff --git a/libgcc/configure.ac b/libgcc/configure.ac
index 2fc9d5d..9c0e415 100644
--- a/libgcc/configure.ac
+++ b/libgcc/configure.ac
@@ -694,6 +694,19 @@ AC_SUBST(tm_defines)
 # Map from thread model to thread header.
 GCC_AC_THREAD_HEADER([$target_thread_file])
 
+AC_CACHE_CHECK([for strub support],
+  [libgcc_cv_strub_support],
+  [AC_COMPILE_IFELSE(
+    [AC_LANG_SOURCE([void __attribute__ ((__strub__)) fn (void) {}])],
+    [libgcc_cv_strub_support=yes],
+    [libgcc_cv_strub_support=no])])
+if test "x$libgcc_cv_strub_support" != xno; then
+  HAVE_STRUB_SUPPORT=
+else
+  HAVE_STRUB_SUPPORT='# '
+fi
+AC_SUBST(HAVE_STRUB_SUPPORT)
+
 # Determine what GCC version number to use in filesystem paths.
 GCC_BASE_VER