fix(build): allow lower address access with gcc-12
With gcc-12 any lower address access can trigger a warning/error
this would be useful in other parts of system but in TF-A
there are various reasons to access to the lower address ranges,
example using mmio_read_*/writes_*
So setup to allow access to lower addresses while using gcc-12
Change-Id: Id1b4012b13bc6876d83b90a347fee12478a1921d
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
diff --git a/make_helpers/build_macros.mk b/make_helpers/build_macros.mk
index 0c82a71..9bf26f0 100644
--- a/make_helpers/build_macros.mk
+++ b/make_helpers/build_macros.mk
@@ -104,6 +104,12 @@
$(shell if $(LD) $(1) -v >/dev/null 2>&1; then echo $(1); fi )
endef
+# 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
+define cc_option
+ $(shell if $(CC) $(1) -c -x c /dev/null -o /dev/null >/dev/null 2>&1; then echo $(1); fi )
+endef
+
# CREATE_SEQ is a recursive function to create sequence of numbers from 1 to
# $(2) and assign the sequence to $(1)
define CREATE_SEQ