It would be nice to have an option to create a package in order to ease human error in the release process:

hdlmake --pack-src
hdlmake --pack-bin

• Print information about the software used to generate the binaries (hdlmake, python, ISE)
• Print information about which commit has been used to generate the binaries
• Possibility to add the generated doc (pdf) into the package. This could be done by letting the user include its own code into the auto generated Makefile (Makefile_hdlmake.inc)
• Name the package according to a standard nomenclature. i.e, date>.tar.gz

For the source: It would be similar but it should not put the binary files into the package.