find-debuginfo: Allow for specifying output dir for all *.list files

[Panu Matilainen]

On 10/29/25 5:11 PM, Michal Domonkos wrote:
> This patch series adds a new switch to the find-debuginfo script that allows
> for overriding the output directory which otherwise defaults to the builddir
> argument. A test is included as well. See the commit messages for details.
> 
> The primary motivation is for RPM to avoid polluting the unpacked source tree
> in --build-in-place mode, see the following discussion for details:
 >
 >      https://github.com/rpm-software-management/rpm/discussions/3644
 >

Just FWIW, I wouldn't call that the primary motivation, it's just one of 
the beneficiaries.

In the past, rpm didn't have a good place to put its per-build temporary 
files, so it used RPM_BUILD_DIR. This has caused issues long before 
--build-in-place even existed, eg. 
https://bugzilla.redhat.com/show_bug.cgi?id=672538

I prefer to think of this as a generic build hygiene kind of thing. It's 
also a pre-requisite for a read-only source tree, which could be useful 
for enforcing clean vpath builds, and --build-in-place type usage where 
the source could even be on read-only media. Clearly this isn't 
something every build would/could use, but as an option.

	- Panu -