From 21b9bdf9da645a9b392db0e7ec132fb9aeed5339 Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Mon, 21 Sep 2026 21:12:19 -0700
Subject: Define a new graph interaction API

---
 chapter04/Makefile | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'chapter04/Makefile')

diff --git a/chapter04/Makefile b/chapter04/Makefile
index 7f55b343..e6c8f275 100644
--- a/chapter04/Makefile
+++ b/chapter04/Makefile
@@ -36,6 +36,10 @@ CLZDIR:= build/classes
 main_javas   := $(wildcard $(SRC)/$(SIMPLE)/*java $(SRC)/$(SIMPLE)/*/*java)
 test_javas   := $(wildcard $(TST)/$(SIMPLE)/*java $(TST)/$(SIMPLE)/*/*java)
 main_classes := $(patsubst $(SRC)/%java,$(CLZDIR)/main/%class,$(main_javas))
+# Compile the common adapter into this chapter without copying its sources.
+GRAPH_DIR := $(firstword $(wildcard ../graph graph))
+graph_javas := $(wildcard $(GRAPH_DIR)/src/main/java/com/seaofnodes/graph/*.java)
+main_javas += $(graph_javas)
 test_classes := $(patsubst $(TST)/%java,$(CLZDIR)/test/%class,$(test_javas))
 test_cp      := $(patsubst $(TST)/$(SIMPLE)/%.java,com.seaofnodes.simple.%,$(wildcard $(TST)/$(SIMPLE)/*Test.java))
 classes = $(main_classes) $(test_classes)
@@ -52,8 +56,11 @@ endif
 
 default: $(default_targets)
 
+.PHONY: build
+build: $(main_classes)
+
 # Compile just the out-of-date files
-$(main_classes): build/classes/main/%class: $(SRC)/%java
+$(main_classes): $(CLZDIR)/main/%class: $(SRC)/%java $(graph_javas)
 	@echo "compiling " $@ " because " $?
 	@[ -d $(CLZDIR)/main ] || mkdir -p $(CLZDIR)/main
 	@javac $(JAVAC_ARGS) -cp "$(CLZDIR)/main$(SEP)$(jars)" -sourcepath $(SRC) -d $(CLZDIR)/main $(main_javas)
-- 
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