From d3c1125cfda422cd268e12e0e2a18752edbe6b55 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Wed, 14 Mar 2012 00:55:59 -0400
Subject: Add dependency graph.

---
diff --git a/depgraphs/Build-Depends_system_simplified.dot b/depgraphs/Build-Depends_system_simplified.dot
new file mode 100644
index 0000000..cbe41ac
--- /dev/null
+++ b/depgraphs/Build-Depends_system_simplified.dot
@@ -0,0 +1,57 @@
+/*
+ * Build-Depends_system_simplified.dot
+ * This is a high-level view of build dependencies between system packages.
+ * It is a graph of "Build-Depends" fields, showing dependencies on source
+ * package names rather than binary package names (e.g. "gcc" build-depends on
+ * "mpfr" rather than "libmpfr.4").
+ */
+
+digraph "Build-Depends_system_simplified" {
+	subgraph "Toolchain" {
+		"gcc" -> "gmp"
+		"gcc" -> "mpfr"
+		"gcc" -> "mpc"
+		"gcc" -> "binutils"
+		"gcc" -> "gcc"
+		"gcc" -> "make"
+		"mpfr" -> "gmp"
+		"mpfr" -> "make"
+		"mpfr" -> "gcc"
+		"mpfr" -> "binutils"
+		"mpc" -> "mpfr"
+		"mpc" -> "gmp"
+		"mpc" -> "make"
+		"mpc" -> "gcc"
+		"mpc" -> "binutils"
+		"gmp" -> "make"
+		"gmp" -> "gcc"
+		"gmp" -> "binutils"
+		"make" -> "make"
+		"make" -> "gcc"
+		"make" -> "binutils"
+		"binutils" -> "make"
+		"binutils" -> "gcc"
+		"binutils" -> "binutils"
+	}
+	subgraph "System" {
+		"busybox" -> "config-<platform>"
+		"busybox" -> "gcc"
+		"busybox" -> "make"
+		"busybox" -> "binutils"
+		"linux" -> "config-<platform>"
+		"linux" -> "make"
+		"linux" -> "gcc"
+		"binutils" -> "binutils"
+		"basefiles-<platform>"
+	}
+	subgraph "Package" {
+		"opkg" -> "gcc"
+		"opkg" -> "make"
+		"opkg" -> "binutils"
+		"fakeroot" -> "gcc"
+		"fakeroot" -> "make"
+		"fakeroot" -> "binutils"
+		"opkhelper"
+		"opkhelper-buildflags"
+	}
+}
diff --git a/depgraphs/Build-Depends_system_simplified.png b/depgraphs/Build-Depends_system_simplified.png
new file mode 100644
index 0000000..8b3ddb8
--- /dev/null
+++ b/depgraphs/Build-Depends_system_simplified.png
Binary files differ
diff --git a/depgraphs/Makefile b/depgraphs/Makefile
new file mode 100644
index 0000000..72db2da
--- /dev/null
+++ b/depgraphs/Makefile
@@ -0,0 +1,21 @@
+# Drawing these graphs requires Graphviz.
+
+.SUFFIXES:
+.SUFFIXES: .dot .png
+
+SRCS = Build-Depends_system_simplified.dot
+OBJS = $(SRCS:.dot=.png)
+
+.PHONY: all
+all: $(OBJS)
+
+$(OBJS):
+	@printf '  DRAW %s\n' '$@'
+	@dot -T png -o '$@' '$*.dot'
+
+.PHONY: clean
+clean:
+	@for obj in $(OBJS); do \
+		printf '  RM %s\n' "$${obj}"; \
+		rm -f $${obj}; \
+	done
--
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