################################################################################
# Desc:   APC make script
# Author: kgr
# Date:   2016
################################################################################
# This makefile builds APC, the Asset Package Compiler for Henge, on the system.
################################################################################
# Yacc
YACC   := bison
YFLAGS ?= -v -d -Wall
YCMD    = $(YACC) $(YFLAGS) $<

# Ragel
RLC     ?= ragel
RLFALGS ?= -C
RLCMD    = $(RLC) $(RLFLAGS) -o $@ $<

# C
CC     ?= gcc
CFLAGS ?= -Wall -Werror
CCMD    = $(CC) $(CFLAGS) $(CPPFLAGS) -o $@ $<

# Linker
LD      ?= ld
LDFLAGS ?= 
LDLIBS  ?=
LDCMD    = $(LD) $(LDFLAGS) $(LDLIBS) -o $@ $^

# APC is built from Ragel, Bison and C source code only.
ySRC  := $(shell find ./src -type f -name '*.y')
rlSRC := $(shell find ./src -type f -name '*.rl')
cSRC  := $(shell find ./src -type f -name '*.c')

# Generated files from Yacc/Bison and Ragel
hGEN  := $(ySRC:%.y=%.tab.h)
cGEN  := $(strip $(ySRC:%.y=%.tab.c) $(rlSRC:%.rl=%.c))

# Functions
cGENDEP = $(if $(wildcard $1),$(subst src/,,$(filter-out $1 \ %:,$(shell $(CC) -MM -MG $1))),$(info <$1>))
ldFLAGS = $(strip $(LDFLAGS) $(LDLIBS) $(VA_ARGS))

# Rules
apcSRC   := $(patsubst %.c,%.o,$(cSRC) $(cGEN))
apc-dSRC := $(patsubst %.o,%-d.o,$(apcSRC))

.SECONDEXPANSION:
apc-d apc: $$($$@SRC) | $(hGEN)
	$(strip $(LDCMD))

%-d.o: CFLAGS+= -Og -ggdb
%.o %-d.o: %.c $$(call cGENDEP,$$(dir $$@)%.c)
	$(strip $(CCMD))

%.tab.h %.tab.c: %.y
	$(strip $(YCMD))
	mv $(notdir $(<:%.y=%.tab.[ch])) $(dir $@)

%.c: %.rl
	$(strip $(RLCMD))

clean: $(wildcard $(cGEN) $(hGEN) $(apcSRC) $(apc-dSRC))
	rm $^