Can't do make to build decryption tools from WireGuard

edit

It works for me when I Fix the second line of CFLAGS. It compiles but for me I cannot run the extract-handshake because of the line 46 of the bash file as it says there's no such file or directory to write.

ifeq ($(KERNELRELEASE),)
KERNELDIR ?= /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)
CFLAGS ?= -O3 -march=native
CFLAGS += -Wall -pedantic -std=gnu11 -static -c
 
offsets.include: offset-finder
    ./$^ > $@
 
offset-finder: offset-finder.c offset-finder.o
    $(CC) $(CFLAGS) $(CPPFLAGS) -o $@ $^
 
offset-finder.o: offset-finder.c
    $(MAKE) -C $(KERNELDIR) M=$(PWD) $@
    objcopy -j '.rodata*' $@ $@
 
clean:
    rm -f offset-finder offsets.include
    $(MAKE) -C $(KERNELDIR) M=$(PWD) clean
 
.PHONY: clean
else
offset-finder-m := offset-finder.o
oldsrc := $(src)
src := $(src)/../../../src
include $(src)/compat/Kbuild.include
include $(src)/crypto/Kbuild.include
src := $(oldsrc)
endif