diff --git a/Makefile b/Makefile
index 6bbca3b..960befc 100644
--- a/Makefile
+++ b/Makefile
@@ -256,10 +256,12 @@
 				-Wlogical-op
 
 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105523
-TF_CFLAGS		+= 	$(call cc_option, --param=min-pagesize=0)
+TF_CFLAGS_MIN_PAGE_SIZE	:=	$(call cc_option, --param=min-pagesize=0)
+TF_CFLAGS		+=	$(TF_CFLAGS_MIN_PAGE_SIZE)
 
 ifeq ($(HARDEN_SLS), 1)
-        TF_CFLAGS_aarch64       +=      $(call cc_option, -mharden-sls=all)
+        TF_CFLAGS_MHARDEN_SLS	:=      $(call cc_option, -mharden-sls=all)
+        TF_CFLAGS_aarch64	+=      $(TF_CFLAGS_MHARDEN_SLS)
 endif
 
 else
diff --git a/make_helpers/build_macros.mk b/make_helpers/build_macros.mk
index b6e6421..d454efd 100644
--- a/make_helpers/build_macros.mk
+++ b/make_helpers/build_macros.mk
@@ -96,6 +96,10 @@
 
 # Convenience function to check for a given compiler option. A call to
 # $(call cc_option, --no-XYZ) will return --no-XYZ if supported by the compiler
+# NOTE: consider assigning to an immediately expanded temporary variable before
+# assigning. This is because variables like TF_CFLAGS are recursively expanded
+# and assigning this directly will cause it to be expanded every time the
+# variable is used, potentially thrashing multicore performance.
 define cc_option
 	$(shell if $($(ARCH)-cc) $(1) -c -x c /dev/null -o /dev/null >/dev/null 2>&1; then echo $(1); fi )
 endef