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# Desc:   APC make script
# Author: kgr
# Date:   2016
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# This makefile builds APC, the Asset Package Compiler for Henge, on the system.
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# Directories (can override with env vars)
APC_ROOTDIR := $(if $(APC_ROOTDIR),$(APC_ROOTDIR),.)
APC_SRCDIR  := $(if $(APC_SRCDIR),$(APC_SRCDIR),$(APC_ROOTDIR)/src)

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

# Specify the linker (allow env var override)
LD    := $(if $(LD),$(LD),ld)

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

# Rules
apc-d: $(patsubst %.c,%-d.o,$(cSRC) $(cGEN)) | $(hGEN)
	$(LD) $(LDFLAGS) $(LDLIBS) $<

apc: $(patsubst %.c,%.o,$(cSRC) $(cGEN)) | $(hGEN)
	$(LD) $(LDFLAGS) $(LDLIBS) $<

%.tab.h %.tab.c: %.y
	bison -d $(YFLAGS) $<

cFLAGS = $(strip $(CFLAGS) $(CPPFLAGS) $1 $2 $3 $4 $5 $6 $7 $8 $9)
GENDEP = $(filter-out $1 \ %:,$(shell $(CC) -MM -MG $1))
.SECONDEXPANSION:
%.o: %.c $$(info $$(call GENDEP,$$(dir $$@)%.c))
	$(CC) $(call cFLAGS,-c,-o $@) $<

%-d.o: %.c $$(info $$@DEPS- $$(call GENDEP,$$(dir $$@)%.c)) $$(call GENDEP,$$(dir $$@)%.c)
	$(CC) $(call cFLAGS,-c,-Og,-ggdb,-o $@) $<