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[Maintenance] builddefs: common_rules: overhaul debug information generation (#24352)

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builddefs: common_rules: overhaul debug information generation

Debug information is always generated while compiling a binary, but
debugging is not the main use-case for the majority of users. Thus the
new default is to explicitly require them with `DEBUG_ENABLE=yes`. The
same is true for linker map files which are gated by the same flag.

As we target the gcc compiler and debug with the gdb debugger we can
specify the ggdb3 flag in the most verbose to get macro expansion.

Signed-off-by: Stefan Kerkmann <karlk90@pm.me>
This commit is contained in:
Stefan Kerkmann 2024-09-01 19:54:53 +02:00 committed by GitHub
parent 07535aa2c0
commit d210590d4d
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GPG Key ID: B5690EEEBB952194
2 changed files with 19 additions and 25 deletions
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39
builddefs/common_rules.mk
View File

@ -43,6 +43,18 @@ ifneq ($(USE_CCACHE),no)
CC_PREFIX ?= ccache
endif
#---------------- Debug Options ----------------
DEBUG_ENABLE ?= no
ifeq ($(strip $(DEBUG_ENABLE)),yes)
CFLAGS += -ggdb3
CXXFLAGS += -ggdb3
ASFLAGS += -ggdb3
# Create a map file when debugging
LDFLAGS += -Wl,-Map=$(BUILD_DIR)/$(TARGET).map,--cref
endif
#---------------- C Compiler Options ----------------
ifeq ($(strip $(LTO_ENABLE)), yes)
@ -54,14 +66,6 @@ ifeq ($(strip $(LTO_ENABLE)), yes)
CDEFS += -DLTO_ENABLE
endif
DEBUG_ENABLE ?= yes
ifeq ($(strip $(SKIP_DEBUG_INFO)),yes)
DEBUG_ENABLE=no
endif
ifeq ($(strip $(DEBUG_ENABLE)),yes)
CFLAGS += -g$(DEBUG)
endif
CFLAGS += $(CDEFS)
CFLAGS += -O$(OPT)
# add color
@ -83,9 +87,6 @@ CFLAGS += -fcommon
#---------------- C++ Compiler Options ----------------
ifeq ($(strip $(DEBUG_ENABLE)),yes)
CXXFLAGS += -g$(DEBUG)
endif
CXXFLAGS += $(CXXDEFS)
CXXFLAGS += -O$(OPT)
# to suppress "warning: only initialized variables can be placed into program memory area"
@ -106,14 +107,10 @@ endif
#---------------- Linker Options ----------------
CREATE_MAP ?= yes
ifeq ($(CREATE_MAP),yes)
LDFLAGS += -Wl,-Map=$(BUILD_DIR)/$(TARGET).map,--cref
endif
ifeq ($(VERBOSE_LD_CMD),yes)
LDFLAGS += -v
endif
#LDFLAGS += -Wl,--relax
LDFLAGS += $(EXTMEMOPTS)
LDFLAGS += $(patsubst %,-L%,$(EXTRALIBDIRS))
LDFLAGS += -lm
@ -126,15 +123,11 @@ ADHLNS_ENABLE ?= no
ifeq ($(ADHLNS_ENABLE),yes)
# Avoid "Options to '-Xassembler' do not match" - only specify assembler options at LTO link time
ifeq ($(strip $(LTO_ENABLE)), yes)
LDFLAGS += -Wa,-adhlns=$(BUILD_DIR)/$(TARGET).lst
LDFLAGS += -Wa,-adhlns=$(BUILD_DIR)/$(TARGET).lst
else
CFLAGS += -Wa,-adhlns=$(@:%.o=%.lst)
CFLAGS += -Wa,-adhlns=$(@:%.o=%.lst)
CXXFLAGS += -Wa,-adhlns=$(@:%.o=%.lst)
ifeq ($(strip $(DEBUG_ENABLE)),yes)
ASFLAGS = -Wa,-adhlns=$(@:%.o=%.lst),-gstabs,--listing-cont-lines=100
else
ASFLAGS = -Wa,-adhlns=$(@:%.o=%.lst),--listing-cont-lines=100
endif
ASFLAGS += -Wa,-adhlns=$(@:%.o=%.lst),--listing-cont-lines=100
endif
endif

5
docs/other_vscode.md
View File

@ -177,12 +177,13 @@ You'll need to perform some modifications to the file above in order to target y
Windows builds of QMK Firmware are generally compiled using QMK MSYS, and the path to gdb's location (`C:\\QMK_MSYS\\mingw64\\bin`) needs to be specified under `armToolchainPath` for it to be detected. You may also need to change the GDB path to point at `C:\\QMK_MSYS\\mingw64\\bin\\gdb-multiarch.exe` in the VSCode Cortex-Debug user settings: ![VSCode Settings](https://i.imgur.com/EGrPM1L.png)
:::
Optionally, the following modifications should also be made to the keyboard's `rules.mk` file to disable optimisations -- not strictly required but will ensure breakpoints and variable viewing works correctly:
The following modifications must be made to the keyboard's `rules.mk` file to enable debug information and disable optimisations -- this will ensure breakpoints and variable viewing works correctly:
```makefile
# Enable debug information in the final binaries
DEBUG_ENABLE = yes
# Disable optimisations for debugging purposes
LTO_ENABLE = no
OPT = g
DEBUG = 3
```
At this point, you should build and flash your firmware through normal methods (`qmk compile ...` and `qmk flash ...`).