################################################################################
# This makefile builds APC, the Asset Package Compiler for Henge, on the system.
################################################################################
+# Driver sources
+DRIVERS := apc testapc
+
# 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 $@ $<
+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 $(LD) $(LDFLAGS) $(LDLIBS) $($1LIBS) $(if $2,-o $2) $1)
# APC is built from Ragel, Bison and C source code only.
ySRC := $(shell find ./src -type f -name '*.y')
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
+# Filter all other driver objects out of each driver's link commands.
$(foreach drv,$(DRIVERS),\
$(eval $(drv)SRC := $(patsubst %.c,%.o,$(filter-out $(patsubst %,src/%.c,$(filter-out $(drv),$(DRIVERS))),$(cSRC) $(cGEN))))\
$(eval $(drv)-dSRC := $(patsubst %.o,%-d.o,$($(drv)SRC))))
+# Unless cleaning, deps should be generated for each source file
+ifeq (,$(filter clean,$(MAKECMDGOALS)))
+cGENDEP = $(if $(wildcard $1),$(subst $(dir $1),,$(filter-out $1 \ %:,$(shell $(CC) -MM -MG $1))),\
+$(info [<$1>: no deps - file not found]))
+endif
+
+# Construct the S2S function for generating source files during prerequisite
+# expansion:
+# If we are cleaning, stop. Else print the result of calling '1'. Then, unless
+# we are in -n mode, invoke the result of calling '1' in the shell
+$(if $(filter clean,$(MAKECMDGOALS)),,$(eval S2S += $$(info $$(call $$1,$$2,$$3)))\
+$(if $(filter n,$(MAKEFLAGS)),,$(eval S2S += $$(shell $$(call $$1,$$2,$$3)))))
+
# Rules
.SECONDEXPANSION:
$(DRIVERS:%=%-d) $(DRIVERS): $$($$@SRC) | $(hGEN)
- $(strip $(call LDCMD,$@))
+ $(strip $(call LDCMD,$^,$@))
%-d.o: CFLAGS+= -Og -ggdb
%.o %-d.o: %.c $$(call cGENDEP,$$(dir $$@)%.c)
- $(strip $(CCMD))
-
-%.tab.h %.tab.c: %.y
- $(strip $(YCMD))
- mv $(notdir $(<:%.y=%.tab.[ch])) $(dir $@)
+ $(call CCMD,$<,$@)
-%.c: %.rl
- $(strip $(RLCMD))
+%.tab.h: %.tab.c ;
+%.tab.c: %.y $$(call S2S,YCMD,%.y,$$@) ;
+%.c: %.rl $$(call S2S,RLCMD,%.rl,$$@) ;
clean: $(wildcard $(cGEN) $(hGEN) $(apcSRC) $(apc-dSRC))
$(if $^,rm $^)