Add dependency graph

dependency_graph/Makefile

@@ -0,0 +1,8 @@
+all: deps.png
+
+%.png: %.dot
+	dot $< -Tpng > $@
+
+.PHONY: view-%
+view-%: %.dot
+	dot $< -Tpng | feh -

dependency_graph/deps.dot

@@ -0,0 +1,41 @@
+digraph deps {
+
+    subgraph depsgr {
+        libdwarf [color=slategray];
+        libcxxfileno [label="libc++fileno", color=slategray];
+        libsrk31cxx [label="libsrk31c++", color=slategray];
+        libdwarfpp [color=slategray];
+
+        dwarfassembly [label="dwarf-assembly", color=limegreen];
+        libunwind [label="libunwind-eh_elf", color=limegreen];
+        perf [label="perf-eh_elf", color=limegreen];
+
+        dwarfinterpret [color=blue];
+        framemachine [label="frame-machine", color=blue];
+        libdwarfpptests [label="libdwarfpp-tests", color=blue];
+
+
+        libdwarf -> libdwarfpp;
+        libcxxfileno -> libsrk31cxx;
+        libcxxfileno -> libdwarfpp;
+        libsrk31cxx -> libdwarfpp;
+
+        libdwarfpp -> dwarfassembly;
+
+        libunwind -> perf;
+
+        libdwarfpp -> dwarfinterpret;
+        libdwarfpp -> framemachine;
+        libdwarfpp -> libdwarfpptests;
+    }
+
+    subgraph cluster_key {
+        label="Key";
+
+        extdep [label="External dependency", color=slategray];
+        main   [label="Main project", color=limegreen];
+        side   [label="Side project", color=blue];
+    }
+
+    framemachine -> main [style=invis];
+}