[CMake] Building with debug information using Makefiles

[Tron Thomas]

I am trying to use CMake to configure a cross platform project I'm 
developing.  On platforms that have IDE's such as Mac OS X and Windows, 
the configuration work fine in that programs can be built with debug 
information for development purposes.  On Linux, I am just using 
Makefiles and no specific IDE.  I find that when I configure the 
project, the built executable do not contain debug information unless I 
go into each target and add special case code to enable debug symbols 
for the Linux platform.

How can I avoid having to specify debug information for each individual 
target when building with Makefiles?