I (definitely non-pro) have used tungsten film and quartz halogen work lights to do this. Generally the wire guard on the lights needs to be removed to avoid slight shadow patterns. The down sides are 1) The selection of tungsten films is minuscule, 2) the lights get hot as hell.
Glass over a painting is not a problem if, as mike_c says, you use two lights off to the sides. The problem areas are the camera itself (or chrome tripod hardware) reflected in the glass and/or the rough textures of paintings done in oil or acrylic that have a shiny varnish surface. The latter is a problem with or without glass. I shoot with the camera lens poked through a slit in a large piece of dark fabric hung from a background stand. A polarizer on the lens may help some with the rough painting texture problem, but the ideal is polarizers on the lights and the camera. The cost of polarizing material can make this an expensive proposition.
I currently use four modest size softboxes with rather hefty 5500º "compact" fluorescents for light, using daylight film (or often, the technology that shall not be named ...) Since my work is usually low resolution for website use, I'm generally able to get by without cross polarizers. If we were talking fine art repro, well then there would be more work and $$$$ involved!
Not sure where they are, but there have been some other threads on this topic.
DaveT