From ac6286bc9332128da724dbdbaa63fb8236112094 Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Sat, 25 Jun 2022 19:08:08 -0700
Subject: Support header-only components.

---
 Makefile      | 35 ++++++++++++++++++++++-------------
 aisa/aisa.cpp |  7 -------
 2 files changed, 22 insertions(+), 20 deletions(-)
 delete mode 100644 aisa/aisa.cpp

diff --git a/Makefile b/Makefile
index 28dd7f6..c8286f5 100644
--- a/Makefile
+++ b/Makefile
@@ -9,15 +9,34 @@ CXXFLAGS := -Wall -Werror -std=c++20 -fPIC -iquote . ${OPTIMIZE} ${DEBUG}
 libname = $(shell realpath --canonicalize-missing --relative-to . build/$(dir $(1))/lib$(notdir $(1)))
 
 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))
+PARTARS :=
+PARTSOS :=
 
 MAINOBJS := $(patsubst %.cpp, build/%.o, $(wildcard *.cpp))
 MAINOBJS += build/git-tag.o
 
 HEADERS := $(find -type f -name \*.h)
 
-all: issim
+.DEFAULT: issim issim-static
+
+define mklib =
+
+ifneq ($(wildcard $(1)/*.cpp),)
+
+$(call libname, $(1).a): $(patsubst %.cpp, build/%.o, $(wildcard $(1)/*.cpp))
+	@mkdir -p $$(dir $$@)
+	$${AR} cr $$@ $$+
+
+$(call libname, $(1).so): $(patsubst %.cpp, build/%.o, $(wildcard $(1)/*.cpp))
+	@mkdir -p $$(dir $$@)
+	$${CXX} $${CXXFLAGS} -shared -o $$@ $$+
+
+PARTARS += $(call libname, $(1).a)
+PARTSOS += $(call libname, $(1).so)
+
+endif
+
+endef
 
 issim: build/issim-dynamic
 	@ln -sf $< $@
@@ -54,16 +73,6 @@ build/%.o: build/%.cpp
 	@mkdir -p $(dir $@)
 	${CXX} ${CXXFLAGS} -MMD -c -o $@ $<
 
-define mklib =
-$(call libname, $(1).a): $(patsubst %.cpp, build/%.o, $(wildcard $(1)/*.cpp))
-	@mkdir -p $$(dir $$@)
-	$${AR} cr $$@ $$+
-
-$(call libname, $(1).so): $(patsubst %.cpp, build/%.o, $(wildcard $(1)/*.cpp))
-	@mkdir -p $$(dir $$@)
-	$${CXX} $${CXXFLAGS} -shared -o $$@ $$+
-endef
-
 $(foreach part, ${PARTS}, $(eval $(call mklib, ${part})))
 
 .SUFFIXES:
diff --git a/aisa/aisa.cpp b/aisa/aisa.cpp
deleted file mode 100644
index 97a3b17..0000000
--- a/aisa/aisa.cpp
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <iostream>
-
-#include "aisa/aisa.h"
-
-namespace aisa {
-
-}
-- 
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