Re: [libvirt] [PATCHv2 2/2] build: fix VPATH build of docs

The rule of thumb for generated files: If they are distributed, they should be generated in $(srcdir); otherwise, they should be built by the end user in $(builddir). Since our .xml docs are built with python, and we want them available even to end users that don't build with python, we want them distributed; hence, they must live in $(srcdir). Tested with 'make distcheck' in both an in-tree build and a VPATH build. * docs/Makefile.am (EXTRA_DIST): Remove redundant listing of xml files. ($(devhelphtml)): Since we distribute .xml, build it in srcdir. (html/%-%.html, html/%-virterror.html, %-api.xml, %-refs.xml): Rewrite with... (python_generated_files): ...new macro. (libvirt-api.xml, libvirt-refs.xml): ...longhand. (api, web, html/index.html, maintainer-clean-local): (html/index.html, %.html.tmp, %.html): Update location. (dot_html_in, patches): Massage wildcard correctly. * docs/apibuild.py (docBuilder.serialize): Put output in srcdir. (docBuilder.serialize_xrefs_references): Update location. (rebuild): Look for built libvirt.h in builddir. * .gitignore: Ignore 'make distcheck' crumbs.