[RFC PATCH] Kconfig: Add an option for debugging OpenSBI

[Bin Meng]

Add a new Kconfig option CONFIG_OPENSBI_DEBUG to prevent compiler
optimizations using -O2.

Signed-off-by: Bin Meng <bmeng at tinylab.org>
---

 Kconfig  | 7 +++++++
 Makefile | 7 ++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/Kconfig b/Kconfig
index acfc138..123ea66 100644
--- a/Kconfig
+++ b/Kconfig
@@ -23,3 +23,10 @@ source "$(OPENSBI_SRC_DIR)/lib/sbi/Kconfig"
 source "$(OPENSBI_SRC_DIR)/lib/utils/Kconfig"
 
 source "$(OPENSBI_SRC_DIR)/firmware/Kconfig"
+
+menu "General Setup"
+
+config OPENSBI_DEBUG
+	bool "Disable compiler optimizations for debugging"
+
+endmenu
diff --git a/Makefile b/Makefile
index b20404f..b4ed548 100644
--- a/Makefile
+++ b/Makefile
@@ -331,7 +331,12 @@ GENFLAGS	+=	$(libsbiutils-genflags-y)
 GENFLAGS	+=	$(platform-genflags-y)
 GENFLAGS	+=	$(firmware-genflags-y)
 
-CFLAGS		=	-g -Wall -Werror -ffreestanding -nostdlib -fno-stack-protector -fno-strict-aliasing -O2
+CFLAGS		=	-g -Wall -Werror -ffreestanding -nostdlib -fno-stack-protector -fno-strict-aliasing
+ifeq ($(CONFIG_OPENSBI_DEBUG),y)
+CFLAGS		+=	-O0
+else
+CFLAGS		+=	-O2
+endif
 CFLAGS		+=	-fno-omit-frame-pointer -fno-optimize-sibling-calls -mstrict-align
 # enable -m(no-)save-restore option by CC_SUPPORT_SAVE_RESTORE
 ifeq ($(CC_SUPPORT_SAVE_RESTORE),y)
-- 
2.25.1