libstdc++ Documentation

[Benjamin Kosnik]

> I've been wanting to be able to do this without needing a build directory
> in place already (hence, no information produced by configure/make should
> be required).  Thus the script you see there.  There's a "doxygen" target
> in the top Makefile, but it just runs the script.

This strikes me as unreasonable. You'd need a build directory to do the 
traditional 'make info' so requiring a build directory to do 'make 
doxygen' doesn't seem so draconian to me.