RelWithDebInfo build in linux

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I am used to build a debug and release version of the OpenCV library in Windows.

By starting to use Linux I learned that there are debug libraries rarely used. The way to go is build with RelWithDebInfo, which is not fully optimized but has the capabilities to get the debuginfo if needed.

The current release of OpenCV (2.4.3) is only offering the configuration types Debug and Release by using cmake.

Why is RelWithDebInfo not usable? Should I go with a Release and a Debug build? Why have the Debug libraries no "d" as Suffix like the windows libraries have?

Thanks in advance