Which man page describes the usage of the top-level RPM spec file macros that are defined in RPM source files directly? I mean, %setup, %buildroot and the like, which are not in /usr/lib/rpm. Looking up the %setup options in a tutorial at rpm.org or searching through the source code isn't best of convenience.
Reference for RPM spec macros (%setup, %buildroot, etc)
rpmspecfile
Best Answer
The Fedora Project hosts the best documentation on RPM out there in html format:
http://docs.fedoraproject.org/en-US/Fedora_Draft_Documentation/0.1/html-single/RPM_Guide/index.html
See also:
http://fedoraproject.org/wiki/How_to_create_an_RPM_package
Prior to these resources, my go to guide was Maximum RPM (which you also found):
http://www.rpm.org/