# Copyright (c) 2023 Emma Tebibyte <emma@tebibyte.media>
# Copyright (c) 2023 DTB <trinity@trinity.moe>
# Copyright (c) 2023 Sasha Koshka <sashakoshka@tebibyte.media>
# SPDX-License-Identifier: FSFAP
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice and this
# notice are preserved.  This file is offered as-is, without any warranty.

# If we want to use POSIX make we can’t use ifeq
# .POSIX:
# .PRAGMA: posix_202x
.PHONY: clean
.PHONY: install
.PHONY: test

PREFIX=/usr/local

CC=cc
CFLAGS=-O3 -Lbuild/lib -idirafter include

RUSTC=rustc +nightly
RUSTCFLAGS=-Zlocation-detail=none -Copt-level=z -Ccodegen-units=1 \
	-Cpanic=abort -Clto=y -Cstrip=symbols -Ctarget-cpu=native \
	--extern sysexits=build/o/libsysexits.rlib

ifeq ($(CC), gcc)
	CFLAGS=-O3 -s -Wl,-z,noseparate-code,-z,nosectionheader -flto -Lbuild/lib \
		-idirafter include
endif

ifeq ($(CC), clang)
	CFLAGS=-O3 -Wall -Lbuild/lib -idirafter include
endif

ifeq ($(CC), tcc)
	CFLAGS=-O3 -s -Wl -flto -Lbuild/lib -idirafter include
endif

build: build_dir false intcmp scrut str strcmp true

build_dir:
	# keep build/include until bindgen(1) has stdin support
	# https://github.com/rust-lang/rust-bindgen/issues/2703
	mkdir -p build/bin build/include build/lib build/o

clean:
	rm -rf build/

install: build
	mkdir -p $(PREFIX)/bin $(PREFIX)/lib
	mkdir -p $(PREFIX)/man/man1 $(PREFIX)/man/man3
	cp -f build/lib/*.so $(PREFIX)/lib/
	cp -f build/bin/* $(PREFIX)/bin/
	cp -f docs/*.1 $(PREFIX)/man/man1/
	cp -f docs/*.3 $(PREFIX)/man/man3/

test: build
	tests/cc-compat.sh
	tests/posix-compat.sh

sysexits: build_dir
	# bandage solution until bindgen(1) gets stdin support
	printf '#define EXIT_FAILURE 1\n' | cat - include/sysexits.h \
		> build/include/sysexits.h 
	bindgen --default-macro-constant-type signed --use-core \
		"$$(printf '#include <sysexits.h>\n' \
		| cpp -M -idirafter "$$PWD/build/include" - \
		| sed 's/ /\n/g' | grep sysexits.h)" \
		| $(RUSTC) $(RUSTCFLAGS) --crate-type lib -o build/o/libsysexits.rlib -

false: src/false.rs build_dir
	$(RUSTC) $(RUSTCFLAGS) -o build/bin/false src/false.rs

fop: src/fop.rs build_dir sysexits
	$(RUSTC) $(RUSTCFLAGS) -o build/bin/fop src/fop.rs

intcmp: src/intcmp.c build_dir
	$(CC) $(CFLAGS) -o build/bin/intcmp src/intcmp.c

scrut: src/scrut.c build_dir
	$(CC) $(CFLAGS) -o build/bin/scrut src/scrut.c

str: src/str.c build_dir
	$(CC) $(CFLAGS) -o build/bin/str src/str.c

strcmp: src/strcmp.c build_dir
	$(CC) $(CFLAGS) -o build/bin/strcmp src/strcmp.c

true: src/true.rs build_dir
	$(RUSTC) $(RUSTCFLAGS) -o build/bin/true src/true.rs