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make: Add a command line option for debugging OpenSBI

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Add a new make command line option "make DEBUG=1" to prevent compiler
optimizations using -O2.

Signed-off-by: Bin Meng <bmeng@tinylab.org>
Reviewed-by: Xiang W <wxjstz@126.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Bin Meng
2023-02-27 10:35:06 +08:00
committed by Anup Patel
parent 908be1b85c
commit 4b28afc98b
2 changed files with 19 additions and 1 deletions
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7
Makefile
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@@ -331,7 +331,12 @@ GENFLAGS += $(libsbiutils-genflags-y)
GENFLAGS += $(platform-genflags-y)
GENFLAGS += $(firmware-genflags-y)
CFLAGS = -g -Wall -Werror -ffreestanding -nostdlib -fno-stack-protector -fno-strict-aliasing -O2
CFLAGS = -g -Wall -Werror -ffreestanding -nostdlib -fno-stack-protector -fno-strict-aliasing
ifneq ($(DEBUG),)
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)

13
README.md
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@@ -298,6 +298,19 @@ NOTE: Using `BUILD_INFO=y` without specifying SOURCE_DATE_EPOCH will violate
purpose, and should NOT be used in a product which follows "reproducible
builds".
Building with optimization off for debugging
--------------------------------------------
When debugging OpenSBI, we may want to turn off the compiler optimization and
make debugging produce the expected results for a better debugging experience.
To build with optimization off we can just simply add `DEBUG=1`, like:
```
make DEBUG=1
```
This definition is ONLY for development and debug purpose, and should NOT be
used in a product build.
Contributing to OpenSBI
-----------------------