SP: WOLFSSL_SP_SMALL_STACK

Defined when WOLFSSL_SMALL_STACK and !WOLFSSL_SP_NO_MALLOC or on
configuration line as an option to --enable-sp: smallstack.

configure.ac

@@ -6783,6 +6783,10 @@ do
     ENABLED_SP_FF_4096=yes
     ;;
 
+  smallstack)
+    ENABLED_SP_SMALL_STACK=yes
+    ;;
+
   nomalloc)
     ENABLED_SP_NO_MALLOC=yes
     ;;
@@ -6867,6 +6871,10 @@ if test "$ENABLED_SP_SMALL" = "yes"; then
     AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_SP_SMALL"
     AM_CCASFLAGS="$AM_CCASFLAGS -DWOLFSSL_SP_SMALL"
 fi
+if test "$ENABLED_SP_SMALL_STACK" = "yes"; then
+    AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_SP_SMALL_STACK"
+    AM_CCASFLAGS="$AM_CCASFLAGS -DWOLFSSL_SP_SMALL_STACK"
+fi
 if test "$ENABLED_SP_NO_MALLOC" = "yes"; then
     AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_SP_NO_MALLOC"
     AM_CCASFLAGS="$AM_CCASFLAGS -DWOLFSSL_SP_NO_MALLOC"