# if $CC is not set, use gcc as a sensible default
CC ?= gcc
RM ?= rm -fv

# if $CFLAGS is not set, be very pedantic and compile
# as C11, that should catch some common errors, also
# fortify the source, which is a must for security.
CFLAGS ?= -Wall \
    -D_FORTIFY_SOURCE=2 \
    -Wextra -Wcast-align -Wcast-qual -Wpointer-arith \
    -Waggregate-return -Wunreachable-code -Wfloat-equal \
    -Wformat=2 -Wredundant-decls -Wundef \
    -Wdisabled-optimization -Wshadow -Wmissing-braces \
    -Wstrict-aliasing=2 -Wstrict-overflow=5 -Wconversion \
    -Wno-unused-parameter \
    -pedantic -std=c11

CFLAGS_DEBUG := -g3 \
    -O \
    -DDEBUG

CFLAGS_RELEASE := -O2 \
    -DNDEBUG \
    -march=native \
    -mtune=native \
    -ftree-vectorize

# the default target is debug
all: debug

# clean target, removing all .o and the executable
clean:
	$(RM) *o bs_exe

# when the target is debug,
# add CFLAGS_DEBUG to CFLAGS
debug: CFLAGS += $(CFLAGS_DEBUG)
debug: clean bs_exe

# when the target is release,
# add CFLAGS_RELEASE to CFLAGS
release: CFLAGS += $(CFLAGS_RELEASE)
release: clean bs_exe

bs_exe: main.o
	$(CC) $^ -o $@ $(CFLAGS)

# when looking for something that ends in .o, look
# for the same thing ending in .c and run gcc on it
%.o: %.c
	$(CC) -c $< $(CFLAGS)

.PHONY: debug release clean