bug#62791: BUILT_SOURCES not honoured in parallel build?

[Reuben Thomas]

On Sat, 9 Dec 2023 at 00:03, Karl Berry <karl@freefriends.org> wrote:

    The manual currently says: "You should never explicitly mention the
    intermediate (C or C++) file in any `SOURCES' variable; only list
    the source file." 

I don't know the code here, and this probably wasn't the question, but I
think the manual's statement about "any `SOURCES' variables" was simply
not meant to apply to BUILT_SOURCES (probably didn't think about it),

I did wonder that myself.

but rather to the "normal" something_SOURCES variables. So my gut
reaction is to add "(except @code{BUILT_SOURCES}, see below)".

    Later, it talks about adding the header file to
    "BUIILT_SOURCES". This seems at odds with what Mike said and I found
    empirically.

I suggest that we could just say to add both files, although if you want
to try to understand what's actually going on, more power to you :).

In terms of solving the problem, that would seem the safer option.

If you're happy with that, I'll write a patch.

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