From df33e730bde20290deef4fa3c1ea909e70dbac42 Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Sat, 25 Jun 2022 10:14:57 -0700
Subject: Makefile rework, supporting "nested" components.

---
 Makefile | 42 +++++++++++++++++++++++++-----------------
 1 file changed, 25 insertions(+), 17 deletions(-)

diff --git a/Makefile b/Makefile
index 6d3a4ab..449455e 100644
--- a/Makefile
+++ b/Makefile
@@ -6,13 +6,17 @@ CXX ?= g++
 
 CXXFLAGS := -Wall -Werror -std=c++20 -fPIC -iquote . ${OPTIMIZE} ${DEBUG}
 
-PARTS := $(shell find * -type d -\( -name build -prune -o -print -\))
-PARTARS := $(addprefix build/lib, $(addsuffix .a, ${PARTS}))
-PARTSOS := $(addprefix build/lib, $(addsuffix .so, ${PARTS}))
+libname = $(shell realpath --canonicalize-missing --relative-to . build/$(dir $(1))/lib$(notdir $(1)))
 
-MAINOBJS := $(addprefix build/, $(addsuffix .o, $(basename $(wildcard *.cpp))))
+PARTS := $(shell find * -type d -\( -name build -prune -o -name tools -prune -o -print -\))
+PARTARS := $(foreach part, ${PARTS}, $(call libname, ${part}.a))
+PARTSOS := $(foreach part, ${PARTS}, $(call libname, ${part}.so))
+
+MAINOBJS := $(patsubst %.cpp, build/%.o, $(wildcard *.cpp))
 MAINOBJS += build/git-tag.o
 
+HEADERS := $(find -type f -name \*.h)
+
 all: issim
 
 issim: build/issim-dynamic
@@ -40,23 +44,27 @@ build/git-tag.cpp:
 	./get-git-tag > $@
 .PHONY: build/git-tag.cpp
 
-build/%.o: %.cpp Makefile
+include $(shell find -type f -name \*.d)
+
+build/%.o: %.cpp
 	@mkdir -p $(dir $@)
-	${CXX} ${CXXFLAGS} -c -o $@ $<
+	${CXX} ${CXXFLAGS} -MMD -c -o $@ $<
 
-build/%.o: build/%.cpp Makefile
+build/%.o: build/%.cpp
 	@mkdir -p $(dir $@)
-	${CXX} ${CXXFLAGS} -c -o $@ $<
+	${CXX} ${CXXFLAGS} -MMD -c -o $@ $<
 
-.SUFFIXES:
-.SECONDARY:
+define mklib =
+$(call libname, $(1).a): $(patsubst %.cpp, build/%.o, $(wildcard $(1)/*.cpp))
+	@mkdir -p $$(dir $$@)
+	$${AR} cr $$@ $$+
 
-.SECONDEXPANSION:
+$(call libname, $(1).so): $(patsubst %.cpp, build/%.o, $(wildcard $(1)/*.cpp))
+	@mkdir -p $$(dir $$@)
+	$${CXX} $${CXXFLAGS} -shared -o $$@ $$+
+endef
 
-build/lib%.a: $$(addprefix build/, $$(addsuffix .o, $$(basename $$(wildcard %/*.cpp))))
-	@mkdir -p $(dir $@)
-	${AR} cr $@ $+
+$(foreach part, ${PARTS}, $(eval $(call mklib, ${part})))
 
-build/lib%.so: $$(addprefix build/, $$(addsuffix .o, $$(basename $$(wildcard %/*.cpp))))
-	@mkdir -p $(dir $@)
-	${CXX} ${CXXFLAGS} -shared -o $@ $+
+.SUFFIXES:
+.SECONDARY:
-- 
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