prefix := $(WASMBUILDS)/libc/
.DEFAULT_GOAL := all

PATHTOMUSLSRC := ./emscripten/system/lib/libc/musl/src
MUSLMODULES := $(shell find $(PATHTOMUSLSRC) -mindepth 1 -maxdepth 1 -type d)

IGNOREDMODULES := ipc passwd thread signal sched ipc time linux aio exit legacy mq process search setjmp env ldso conf
IGNOREDFILES := getaddrinfo.c getnameinfo.c inet_addr.c res_query.c gai_strerror.c proto.c gethostbyaddr.c gethostbyaddr_r.c gethostbyname.c gethostbyname2_r.c gethostbyname_r.c gethostbyname2.c usleep.c alarm.c syscall.c _exit.c

PROCESSEDMODULES := $(filter-out $(addprefix %/, $(IGNOREDMODULES)), $(MUSLMODULES))
CANDIDATEFILES := $(foreach module, $(PROCESSEDMODULES), $(shell find $(module) -name '*.c'))
PATHTODLMALLOC := ./emscripten/system/lib/dlmalloc.c
WASMLIBCFILES := $(PATHTODLMALLOC) $(filter-out $(addprefix %/, $(IGNOREDFILES)), $(CANDIDATEFILES))

WASMLIBCNAMES := $(notdir $(basename $(WASMLIBCFILES)))
WASMOBJS := $(addprefix obj/, $(addsuffix .o, $(WASMLIBCNAMES)))

vpath %.c $(sort $(dir $(WASMLIBCFILES)))

obj lib:
	mkdir $@

$(WASMOBJS): obj/%.o: %.c | obj
	@$$CC $$CFLAGS -I ./emscripten/system/lib/libc/musl/src/internal -Os \
	-Werror=implicit-function-declaration -Wno-return-type -Wno-parentheses \
	-Wno-ignored-attributes -Wno-shift-count-overflow -Wno-shift-negative-value \
	-Wno-dangling-else -Wno-unknown-pragmas -Wno-shift-op-parentheses -D __EMSCRIPTEN__ \
	-Wno-string-plus-int -Wno-logical-op-parentheses -Wno-bitwise-op-parentheses \
	-Wno-visibility -Wno-pointer-sign -isystem ./emscripten/system/include \
	-isystem ./emscripten/system/include/libc -isystem ./emscripten/system/lib/libc/musl/arch/emscripten \
	-static -c -o $@ $<

lib/libc.a: $(WASMOBJS) | lib
	@$$AR rcs $@ $(WASMOBJS)

all: lib/libc.a

clean:
	rm -rf lib
	rm -rf obj

install: lib/libc.a
	mkdir $(prefix)/lib
	mkdir $(prefix)/include
	cp ./lib/libc.a $(prefix)/lib/
	cp ./emscripten/system/include/emscripten.h $(prefix)/include/
	cp -R ./emscripten/system/include/libc/* $(prefix)/include/
	rm $(prefix)/include/bits
	cp -R ./emscripten/system/include/compat/ $(prefix)/include/
	cp -R ./emscripten/system/include/emscripten $(prefix)/include/
	cp -R ./emscripten/system/lib/libc/musl/arch/emscripten/* $(prefix)/include/

.PHONY: all clean install