CMake: tred: Make compile

```
FAILED: cmd/tools/tred
: && cc  -fPIC -g cmd/tools/CMakeFiles/tred.dir/tred.c.o  -o cmd/tools/tred
-Wl,-rpath,/home/kfunk/devel/build/graphviz/lib/cgraph:/home/kfunk/devel/build/graphviz/lib/cdt:
-rdynamic lib/cgraph/libcgraph.so.6.0.0 lib/ingraphs/libingraphs.a
lib/cdt/libcdt.so.5.0.0 && :
/home/kfunk/devel/src/graphviz/cmd/tools/tred.c:284: error: undefined
reference to 'start_timer'
/home/kfunk/devel/src/graphviz/cmd/tools/tred.c:287: error: undefined
reference to 'elapsed_sec'
```

diff --git a/cmd/tools/CMakeLists.txt b/cmd/tools/CMakeLists.txt
index 8efe75ff43cba1263bb838c7a1d10c93cb542503..75e0f9149f19ab6c83bf7682476e0382f91e006a 100644 (file)
--- a/cmd/tools/CMakeLists.txt
+++ b/cmd/tools/CMakeLists.txt
@@ -55,6 +55,7 @@ add_simple_tool(ccomps)
 add_simple_tool(gc)
 add_simple_tool(nop)
 add_simple_tool(tred)
+target_link_libraries(tred common) # e.g. for start_timer
 add_simple_tool(unflatten)
 
 # ================================ complex tools ===============================