Add support for -fstack-clash-protection

2 files changed, 36 insertions, 0 deletions

diff --git a/configure b/configure
index 72eb7eb..61915a3 100755
--- a/configure
+++ b/configure
@@ -13664,6 +13664,41 @@ else
   :
 fi
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts -fstack-clash-protection" >&5
+$as_echo_n "checking whether C compiler accepts -fstack-clash-protection... " >&6; }
+if ${ax_cv_check_cflags___fstack_clash_protection+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+
+  ax_check_save_flags=$CFLAGS
+  CFLAGS="$CFLAGS  -fstack-clash-protection"
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ax_cv_check_cflags___fstack_clash_protection=yes
+else
+  ax_cv_check_cflags___fstack_clash_protection=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+  CFLAGS=$ax_check_save_flags
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___fstack_clash_protection" >&5
+$as_echo "$ax_cv_check_cflags___fstack_clash_protection" >&6; }
+if test "x$ax_cv_check_cflags___fstack_clash_protection" = xyes; then :
+  DEFAULT_CFLAGS="$DEFAULT_CFLAGS -fstack-clash-protection"
+else
+  :
+fi
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the linker accepts -Wl,--discard-all" >&5
 $as_echo_n "checking whether the linker accepts -Wl,--discard-all... " >&6; }
 if ${ax_cv_check_ldflags___Wl___discard_all+:} false; then :
diff --git a/configure.ac b/configure.ac
index c92407d..fbed15a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -75,6 +75,7 @@ AX_CHECK_COMPILE_FLAG([-Wold-style-definition], [DEFAULT_CFLAGS="$DEFAULT_CFLAGS
 AX_CHECK_COMPILE_FLAG([-Wignored-qualifiers], [DEFAULT_CFLAGS="$DEFAULT_CFLAGS -Wignored-qualifiers"])
 AX_CHECK_COMPILE_FLAG([-fstrict-aliasing -Wstrict-aliasing], [DEFAULT_CFLAGS="$DEFAULT_CFLAGS -fstrict-aliasing -Wstrict-aliasing"])
 AX_CHECK_COMPILE_FLAG([-fstack-protector], [DEFAULT_CFLAGS="$DEFAULT_CFLAGS -fstack-protector"])
+AX_CHECK_COMPILE_FLAG([-fstack-clash-protection], [DEFAULT_CFLAGS="$DEFAULT_CFLAGS -fstack-clash-protection"])
 AX_CHECK_LINK_FLAG([-Wl,--discard-all], [DEFAULT_LDFLAGS="$DEFAULT_LDFLAGS -Wl,--discard-all"])
 AX_CHECK_LINK_FLAG([-Wl,--no-undefined], [DEFAULT_LDFLAGS="$DEFAULT_LDFLAGS -Wl,--no-undefined"])
 AX_CHECK_LINK_FLAG([-Wl,-z,relro,-z,now], [DEFAULT_LDFLAGS="$DEFAULT_LDFLAGS -Wl,-z,relro,-z,now"])