For various reasons, it would be better not to have anything in dist/bin after running configure. interfaces.manifest are the only such thing.

Comment on attachment 8661023 [details] [diff] [review] Don't create interfaces.manifest files from the build backend Review of attachment 8661023 [details] [diff] [review]: ----------------------------------------------------------------- ::: config/makefiles/xpidl/Makefile.in @@ +61,5 @@ > > chrome_manifests := @chrome_manifests@ > > +%/interfaces.manifest: Makefile > + $(call py_action,buildlist,$@ $(foreach xpt,$(filter $*/%,$(registered_xpt_files)),'interfaces $(notdir $(xpt))')) I have recollections of buildlist being slow. Fortunately we're not updating the same manifest so we don't have lock contention. (I think that was the issue before.) But I wouldn't be surprised if this slowed down the build a little. But, if this is needed for other work you are doing, so be it.

We're talking about a total of 3 independent .manifest files here.