CC=gcc

# clang 14.0.3 does implement the C23 feature __VA_OPTS__ but issues a spurious
# warning. The -Wno-gnu-zero-variadic-macro-arguments disables this warning.
# This flag is ignored by gcc (which implements __VA_OPTS__ without any warning).
override CFLAGS += -std=gnu2x -MMD -Wall -pedantic -Wextra -Wshadow -Wpointer-arith	\
-Wcast-qual -Wstrict-prototypes -Wmissing-prototypes

# For MacOS (assuming recent homebrew)
ifeq ($(shell uname -s), Darwin)
	CPPFLAGS+=-I/opt/homebrew/include
	LDFLAGS+=-L/opt/homebrew/lib
	override CFLAGS += -Wno-gnu-zero-variadic-macro-arguments
endif

SOURCES := $(wildcard *.c)
OBJECTS := $(SOURCES:%.c=%.o)
DEPS := $(SOURCES:%.c=%.d)

# Compilation in debug mode by default, to use gdb and valgrind. Warnings produce an error.
all: CFLAGS += -g -O0 -Werror -Wno-unused-parameter -Wno-unused-function -Wno-unused-variable -Wno-unused-but-set-variable
all: stackqueue

# Once the program works, optimized mode (and no error in case of warning).
nowerror: CFLAGS += -O3
nowerror: stackqueue

 stackqueue: $(OBJECTS)
	$(CC) -o $@ $(LDFLAGS) $(CFLAGS) $^ $(LDLIBS)

# Include dependancies generated by gcc -MMD.
-include $(DEPS)

# Clean all.
.PHONY: clean
clean:
	rm -rf stackqueue *.o *.d TAGS core a.out