The global --topdir-format option governs how a project's root
directory is represented in paths output by various queries.
"absolute" means as absolute path, "unaltered" means verbatim as
specified via --topdir, make:xyz means replaced by the string $(xyz),
for later expansion in a makefile variable.
This commit adds another variant: "relative" yields the shortest
possible output format of the output path in question relative to
--topdir, with "shortest possible" in this context meaning
canonicalized and leading "./" stripped.
Signed-off-by: Jan Lindemann <jan@janware.com>
Jan Lindemann
b35d61311c