################################################################################
# This makefile builds APC, the Asset Package Compiler for Henge, on the system.
################################################################################
+# Driver sources
+DRIVERS ?= apc testapc
+
+# Debug Level
+DEBUG ?= 1
+
# Yacc
YACC := bison
YFLAGS ?= -v -d -Wall
-YCMD = $(YACC) $(YFLAGS) $<
+YCMD = $(strip $(YACC) $(YFLAGS) $(if $2,$(dir $2))$1)
+YCMD += $(if $2,&& mv $(notdir $(1:%.y=%.tab.[ch])) $(dir $2))
# Ragel
RLC ?= ragel
-RLFALGS ?= -C
-RLCMD = $(RLC) $(RLFLAGS) -o $@ $<
+RLFLAGS ?= -C
+RLCMD = $(strip $(RLC) $(RLFLAGS) $(if $2,-o $2 $(dir $2))$1)
# C
CC ?= gcc
CFLAGS ?= -Wall
-CCMD = $(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<
+CCMD = $(strip $(CC) $(CFLAGS) $(CPPFLAGS) -c $(if $2,-o $2) $1)
# Linker
LD ?= ld
LDLIBS ?= -lunistring
apcLIBS ?=
apc-dLIBS ?=
-LDCMD = $(LD) $(LDFLAGS) $(LDLIBS) $($1LIBS) -o $@ $^
+LDCMD = $(strip $(CC) $(LDFLAGS) $(if $2,-o $2) $1) $(LDLIBS) $($1LIBS)
# 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')
+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))
-
-# Deps generation function
-cGENDEP = $(if $(wildcard $1),$(subst $(dir $1),,$(filter-out $1 \ %:,$(shell $(CC) -MM -MG $1))),$(info <$1>))
-
-# Driver sources
-DRIVERS := apc testapc
-$(foreach drv,$(DRIVERS),\
-$(eval $(drv)SRC := $(patsubst %.c,%.o,$(filter-out $(patsubst %,src/%.c,$(filter-out $(drv),$(DRIVERS))),$(cSRC) $(cGEN))))\
-$(eval $(drv)-dSRC := $(patsubst %.o,%-d.o,$($(drv)SRC))))
+cGEN := $(strip $(ySRC:%.y=%.tab.c) $(rlSRC:%.rl=%.fsm.c))
+.SECONDARY: $(cGEN)
-# Rules
-.SECONDEXPANSION:
-$(DRIVERS:%=%-d) $(DRIVERS): $$($$@SRC) | $(hGEN)
- $(strip $(call LDCMD,$@))
+# Determine binary/ir targets (object files and driver binaries)
+cTRG := $(patsubst %.c,%.o,$(cSRC) $(cGEN))
+ldSRC := $(filter-out $(DRIVERS:%=\%/%.o),$(cTRG))
+cTRG += $(cTRG:%.o=%-d.o)
+ldTRG := $(DRIVERS:%=%-d) $(DRIVERS)
+ldDEP = $(filter %/$1.o,$(cTRG)) $(if $(filter %-d,$1),$(ldSRC:%.o=%-d.o),$(ldSRC))
-%-d.o: CFLAGS+= -Og -ggdb
-%.o %-d.o: %.c $$(call cGENDEP,$$(dir $$@)%.c)
- $(strip $(CCMD))
+# Determine if '1' is newer than '2'
+TSTAMP = $(if $(wildcard $1),$(shell stat -c %Y $1),0$(info nots: $1))
+NEWER = $(eval 4 := $(call TSTAMP,$(dir $2)$1))
+NEWER += $(eval 5 := $(call TSTAMP,$2))
+NEWER += $(if $(filter $5,$(firstword $(sort $4 $5))),$1,$2)
-%.tab.h %.tab.c: %.y
- $(strip $(YCMD))
- mv $(notdir $(<:%.y=%.tab.[ch])) $(dir $@)
+ifeq (,$(filter clean,$(MAKECMDGOALS)))
+# Deps should be generated for each source file, when not cleaning
+cGENDEP = $(if $(wildcard $1),$(subst $(dir $1),,$(filter-out $1 \ %:,$(shell $(CC) -MM -MG $1))),\
+$(info [<$1>: no deps - file not found]))
+# S2S will print the command necessary to create a file when called
+S2S = $(if $(filter $2,$(call NEWER,$2,$3)),$(eval 4 := t),$(eval 4 :=))
+S2S += $(if $4,$(info $(call $1,$2,$3)))
+ifeq (,$(filter n,$(MAKEFLAGS)))
+# Unless we're in -n mode, S2S should also invoke the command on the shell
+S2S += $(if $4,$(shell $(call $1,$2,$3)))
+endif
+endif
-%.c: %.rl
- $(strip $(RLCMD))
+# Clean targets
+cleanCMD = $(if $(wildcard $1),rm $(wildcard $(sort $1)))
-clean: $(wildcard $(cGEN) $(hGEN) $(apcSRC) $(apc-dSRC))
- $(if $^,rm $^)
+# Rules
+.SECONDEXPANSION:
+$(ldTRG): $$(call ldDEP,$$@) | $(hGEN) ; $(call LDCMD,$^,$@)
+%-d.o: CFLAGS+= -Og -ggdb -DDEBUG=$(DEBUG)
+%.o %-d.o: %.c $$(call cGENDEP,$$(dir $$@)%.c) ; $(call CCMD,$<,$@)
+%.tab.h: %.tab.c ;
+%.tab.c: %.y $$(call S2S,YCMD,%.y,$$@) ;
+%.fsm.c: %.rl $$(call S2S,RLCMD,%.rl,$$@) ;
+clean: ; $(call cleanCMD,$(cGEN) $(hGEN) $(cTRG))
+distclean: clean ; $(call cleanCMD,$(ldTRG))