#line directive, leave the file name alone. The previous behaviour was to make it relative to the tags file directory, under the hypothesis that the #line directive file name was relative to the directory of the tagged file. That hypothesis is wrong with Cpp and Lex. (Makefile_targets): Do not include spaces in tag names.
This directory contains the source code for the architecture-dependent
files that go in ${archlibdir}. At present, these are mostly utility
programs used by GNU Emacs.