At present the build fails in strange ways if CONFIG_SPL is defined by
CONFIG_SUPPORT_SPL is not. Add a warning for this case as it can be very
confusing to debug.

Signed-off-by: Simon Glass <s...@chromium.org>
---

 scripts/Makefile.spl | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/scripts/Makefile.spl b/scripts/Makefile.spl
index e494d185e4b..c71497ff008 100644
--- a/scripts/Makefile.spl
+++ b/scripts/Makefile.spl
@@ -45,6 +45,13 @@ SPL_ :=
 SPL_TPL_ :=
 endif
 
+ifeq ($(obj)$(CONFIG_SUPPORT_SPL),spl)
+$(error You cannot build SPL without enabling CONFIG_SUPPORT_SPL)
+endif
+ifeq ($(obj)$(CONFIG_SUPPORT_TPL),tpl)
+$(error You cannot build TPL without enabling CONFIG_SUPPORT_TPL)
+endif
+
 include $(srctree)/config.mk
 include $(srctree)/arch/$(ARCH)/Makefile
 
-- 
2.19.0.605.g01d371f741-goog

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