HACKING: document how to make debug builds

Signed-off-by: Drew Fisher <drew.m.fisher@gmail.com>

CMakeLists.txt

@@ -98,6 +98,10 @@ SET(DOC_OUTPUT_PATH ${CMAKE_BINARY_DIR}/doc)
 if(CMAKE_C_FLAGS STREQUAL "")
   set(CMAKE_C_FLAGS "-O2")
 endif()
+SET(CMAKE_C_FLAGS_DEBUG "-g -DDEBUG=1")
+SET(CMAKE_C_FLAGS_RELEASE "-O2")
+SET(CMAKE_C_FLAGS_RELWITHDEBINFO "-O2 -g")
+
 add_definitions(-Wall)
 
 # Pretty much everyone is going to need the main includes

HACKING

@@ -82,3 +82,21 @@ In general, for data obtained with the Kinect, we'll provide a raw and a
 
 Avoid trailing whitespace. No lines should end in a tab or a space. Keep a
 newline (blank line) at the end of each file.
+
+=== DEBUG BUILD ===
+
+In order to build the binaries with debug symbols the following commands
+can be used:
+
+	$ mkdir build
+	$ cd build
+	$ cmake ../ -DCMAKE_BUILD_TYPE=debug
+	$ make
+
+If you want to build in release mode (with optimizations) but still have debug
+symbols, try RelWithDebInfo:
+
+	$ mkdir build
+	$ cd build
+	$ cmake ../ -DCMAKE_BUILD_TYPE=RelWithDebInfo
+	$ make