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Support tool-specific standard flags in makefile (#862)

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stnolting 2024-03-26 21:03:08 +01:00 • committed by GitHub
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2 changed files with 23 additions and 5 deletions
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12
docs/datasheet/software.adoc
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@ -224,6 +224,14 @@ MABI ?= ilp32
USER_FLAGS ?=
# User libraries (will be included by linker)
USER_LIBS ?=
# Language specific compiler flags: C
CFLAGS ?=
# C++
CXXFLAGS ?=
# Assembly
ASFLAGS ?=
# Flags passed only to the linker
LDFLAGS ?=
# Relative or absolute path to the NEORV32 home folder
NEORV32_HOME ?= ../../..
# GDB arguments
@ -244,6 +252,10 @@ GDB_ARGS ?= -ex "target extended-remote localhost:3333"
| `MABI` | Application binary interface (default: 32-bit integer ABI `ilp32`)
| `USER_FLAGS` | Additional flags that will be forwarded to the compiler tools
| `USER_LIBS` | Additional libraries to include during linking (`*.a`)
| `CFLAGS` | Additional flags that will be forwarded to the C compiler
| `CXXFLAGS` | Additional flags that will be forwarded to the C++ compiler
| `ASFLAGS` | Additional flags that will be forwarded to the assembler
| `LDFLAGS` | Additional flags that will be forwarded to the linker
| `NEORV32_HOME` | Relative or absolute path to the NEORV32 project home folder; adapt this if the makefile/project is not in the project's default `sw/example` folder
| `GDB_ARGS` | Default GDB arguments when running the `gdb` target
| `GHDL_RUN_FLAGS` | GHDL run arguments (e.g. `--stop-time=1ms`)

16
sw/common/common.mk
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@ -143,6 +143,12 @@ CC_FLAGS = $(CC_OPTS)
# Export compiler flags as define string
CC_FLAGS += -DCC_OPTS="\"$(CC_OPTS)\""
# Allow users to use tool-specific flags
# Uses naming from https://www.gnu.org/software/make/manual/html_node/Implicit-Variables.html
NEO_CFLAGS = $(CC_FLAGS) $(CFLAGS)
NEO_CXXFLAGS = $(CC_FLAGS) $(CXXFLAGS)
NEO_LDFLAGS = $(CC_FLAGS) $(LDFLAGS)
NEO_ASFLAGS = $(CC_FLAGS) $(ASFLAGS)
# -----------------------------------------------------------------------------
# Application output definitions
@ -182,23 +188,23 @@ $(IMAGE_GEN): $(NEORV32_EXG_PATH)/image_gen.c
# -----------------------------------------------------------------------------
# Compile app *.s sources (assembly)
%.s.o: %.s
@$(CC) -c $(CC_FLAGS) -I $(NEORV32_INC_PATH) $(ASM_INC) $< -o $@
@$(CC) -c $(NEO_ASFLAGS) -I $(NEORV32_INC_PATH) $(ASM_INC) $< -o $@
# Compile app *.S sources (assembly + C pre-processor)
%.S.o: %.S
@$(CC) -c $(CC_FLAGS) -I $(NEORV32_INC_PATH) $(ASM_INC) $< -o $@
@$(CC) -c $(NEO_ASFLAGS) -I $(NEORV32_INC_PATH) $(ASM_INC) $< -o $@
# Compile app *.c sources
%.c.o: %.c
@$(CC) -c $(CC_FLAGS) -I $(NEORV32_INC_PATH) $(APP_INC) $< -o $@
@$(CC) -c $(NEO_CFLAGS) -I $(NEORV32_INC_PATH) $(APP_INC) $< -o $@
# Compile app *.cpp sources
%.cpp.o: %.cpp
@$(CC) -c $(CC_FLAGS) -I $(NEORV32_INC_PATH) $(APP_INC) $< -o $@
@$(CC) -c $(NEO_CXXFLAGS) -I $(NEORV32_INC_PATH) $(APP_INC) $< -o $@
# Link object files and show memory utilization
$(APP_ELF): $(OBJ)
@$(CC) $(CC_FLAGS) -T $(LD_SCRIPT) $(OBJ) $(LD_LIBS) -o $@
@$(CC) $(NEO_LDFLAGS) -T $(LD_SCRIPT) $(OBJ) $(LD_LIBS) -o $@
@echo "Memory utilization:"
@$(SIZE) $(APP_ELF)