Makefile can I execute a configuration only once? - c

Question

Im trying to create a Makefile which compiles some files and creates some outputs but first I want it to execute the configuration only one time and the next time I type make it wont re-execute the configuration unless I change the parameters for example the prefix.
I tried using touch , FORCE and if, after searching a bit in other posts but Im newbie in gcc and Makefiles so I cant make it work.
My code now is (did not include the other rules because they dont affect the configuration):
XLEN := 32
RISCV_PREFIX := riscv$(XLEN)-unknown-elf-
RISCV_GCC := $(RISCV_PREFIX)gcc
CFLAGS := -O2
WORKING_DIR:= $(shell pwd)
LIBRARY_DIR:= $(abspath $(dir $(lastword $(MAKEFILE_LIST)))/..)
B := $(shell echo $(LIBRARY_DIR))
$(info $(B))
--->(execute this only once)---> CONFIGURATION := configure --prefix=$(LIBRARY_DIR) --with-arch=rv32if --with-abi=ilp32d
RISCV_TEST_DIR:=$(shell pwd)
SCRIPTDIR:=$(RISCV_TEST_DIR)/../../tools
RISCV_OPTIONS = -o
RISCV_LINK = $(RISCV_GCC) $(PROGRAMS) $(RISCV_OPTIONS) $# $(CFLAGS) #produces .elf file!
RISCV_OBJDUMP = $(RISCV_PREFIX)objdump -D #produces a dump file to see the assembly code!
RISCV_OBJCOPY = $(RISCV_PREFIX)objcopy -O binary #produces a bin file!
%.elf: %.c
$(info Generating .elf file from files: $(PROGRAMS_NO_EX))
$(RISCV_LINK)
$(info Success!)
$(info ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~)
%.dump: %.elf
$(info Copying assembly to dump file $(PROGRAMS_NO_EX).dump)
#$(RISCV_OBJDUMP) $< > $#
$(info Success!)
$(info ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~)
%.bin: %.elf
$(info Generating bin file)
#$(RISCV_OBJCOPY) $< $#
$(info Success!)
$(info ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~)
%.hex: %.bin
$(info Generating hex file)
echo cd $(SCRIPTDIR)
$(info Running binary to hex >>>)
python $(SCRIPTDIR)/bin2hex.py $< -a 0x0 > $# || exit -1
$(info Hex Generation Successful!)
$(info ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~)
all: $(PROGRAMS_TO_CREATE); if [ -a $(LIBRARY_DIR)/config.status ]; then cd $(LIBRARY_DIR) && $(CONFIGURATION); fi;
configure: config.status
touch configure
config.status:
cd $(LIBRARY_DIR) && $(CONFIGURATION);
.PHONY: all clean
clean:
$(info Cleaning files...)
#rm -rf *.elf *.hex *.map *.objdump *.i *.s *.bin *.dump
$(info Done cleaning!)
Thank you in advance!

Answer 1

I believe the only problem with your configuration statements are incorrect paths in rules for config.status and configure, since they really will be located within $(LIBRARY_DIR). When the paths are correct, it will correctly run configuration only once:
$ cat Makefile
LIBRARY_DIR := library
all: $(LIBRARY_DIR)/config.status
$(info Making $#)
$(LIBRARY_DIR)/config.status: $(LIBRARY_DIR)/configure
cd $(<D) && ./$(<F)
Output:
$ make
cd library && ./configure
Making all
$ make # <--- Invoking second time, no configure step
Making all
make: 'all' is up to date.

Answer 2

With #raspy's help managed to solve the problem like this:
all: $(PROGRAMS_TO_CREATE)
$(PROGRAMS_TO_CREATE):$(LIBRARY_DIR)/config.status
$(LIBRARY_DIR)/config.status:
cd $(LIBRARY_DIR) && $(CONFIGURATION)