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| author | Bin Meng <bmeng@tinylab.org> | 2023-02-27 05:35:06 +0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2023-03-01 06:53:17 +0300 |
| commit | 4b28afc98bbe406e3ad6f4a97d0fe96a882e83a1 (patch) | |
| tree | 6a6b1941a635022a3c3d011cf86bc15a1a7d5540 | |
| parent | 908be1b85c8ff0695ea226fbbf0ff24a779cdece (diff) | |
| download | opensbi-4b28afc98bbe406e3ad6f4a97d0fe96a882e83a1.tar.xz | |
make: Add a command line option for debugging OpenSBI
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>
| -rw-r--r-- | Makefile | 7 | ||||
| -rw-r--r-- | README.md | 13 |
2 files changed, 19 insertions, 1 deletions
@@ -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) @@ -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 ----------------------- |