From: Govindraj Raja <govindraj.raja@arm.com>
Date: Fri, 5 May 2023 14:09:36 +0000 (-0500)
Subject: fix(build): allow lower address access with gcc-12
X-Git-Tag: baikal/aarch64/sdk5.10~1^2~33^2~1
X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=dea23e245fb890c6c06eff7d1aed8fffa981fc05;p=arm-tf.git

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/Makefile b/Makefile
index 7368ca59b..8caa5239a 100644
--- a/Makefile
+++ b/Makefile
@@ -414,6 +414,10 @@ ifeq ($(findstring clang,$(notdir $(CC))),)
 WARNINGS	+=		-Wunused-but-set-variable -Wmaybe-uninitialized	\
 				-Wpacked-bitfield-compat -Wshift-overflow=2 \
 				-Wlogical-op
+
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105523
+TF_CFLAGS		+= 	$(call cc_option, --param=min-pagesize=0)
+
 else
 # using clang
 WARNINGS	+=		-Wshift-overflow -Wshift-sign-overflow \
diff --git a/make_helpers/build_macros.mk b/make_helpers/build_macros.mk
index 0c82a715a..9bf26f083 100644
--- a/make_helpers/build_macros.mk
+++ b/make_helpers/build_macros.mk
@@ -104,6 +104,12 @@ define ld_option
 	$(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