Russ Allbery wrote:
> I would still use dh-autoreconf.  It's not as critical, since it's
> unlikely to be necessary for supporting new architectures, but I
> think the Autoconf and Automake files are better treated as source,
> and the generated files regenerated on every build.

However, this is not how the GNU build system is intended to be used.

> This ensures that the files can still be generated from the source,
> which in turn ensures that anyone wanting to make changes to the
> source package will be able to do so easily.
  
This is an obvious plus, but consider the cons:

- It can provide non-deterministic builds for packages which misuse
  the build system (improper quotation, usage of broken third-party
  macros, etc).
- It can provide non-deterministic builds for legitimate use, when a
  macro changes its semantics (this used to happen quite a lot in the
  past).
- It can introduce bugs for no good reason if a buggy
  Autoconf/Automake version is used (either an upstream release that
  introduced a regression or caused by a Debian patch).
- Packages may (will?) FTBFS if they're silently "upgraded" to a new
  Autoconf/Automake release that requires sourceful changes to
  configure.ac/Makefile.am's/etc and such changes are not made by the
  upstream/Debian maintainer (consider binNMUs, or the regular archive
  rebuilds).
- All of the above can happen on a large scale if a big library
  transition is involved and some stack of packages is being rebuilt.



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