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-rw-r--r--Makefile4
1 files changed, 4 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index ecff944f7..32918c385 100644
--- a/Makefile
+++ b/Makefile
@@ -695,6 +695,10 @@ $(eval $(call assert_numeric,ARM_ARCH_MAJOR))
$(eval $(call assert_numeric,ARM_ARCH_MINOR))
$(eval $(call assert_numeric,BRANCH_PROTECTION))
+ifdef KEY_SIZE
+ $(eval $(call assert_numeric,KEY_SIZE))
+endif
+
ifeq ($(filter $(SANITIZE_UB), on off trap),)
$(error "Invalid value for SANITIZE_UB: can be one of on, off, trap")
endif