Re: Let's stop with the retail rebuilds of src/port/ files already

I wrote:
> Now, if we go forward with that solution, there will be issues with
> some other things that libpq exports without having defined itself:
> src/backend/utils/mb/wchar.c:
> pg_utf_mblen
> src/backend/utils/mb/encnames.c:
> pg_encoding_to_char
> pg_char_to_encoding
> pg_valid_server_encoding
> pg_valid_server_encoding_id
> What I was thinking of proposing was to move those two files out of the
> backend and into src/common/, thereby normalizing their status as
> modules available in both frontend and backend, and removing the need
> for a special build rule for them in libpq. (initdb could be simplified
> too.) Per this discovery, we'd need to also remove these symbols from
> libpq's exports list, meaning that clients *must* get them from -lpgcommon
> not from libpq.

After further study I've concluded that moving those two files would
be more neatnik-ism than is justified. While it'd get rid of the
symlink-a-source-file technique in libpq, there'd still be other
occurrences of that in our tree, so the actual cleanup benefit seems
pretty limited. And while I'm prepared to believe that nobody outside PG
uses pqsignal() or should do so, it's a little harder to make that case
for the encnames.c functions; so the risk of causing problems seems
noticeably greater.

Accordingly, I cleaned up the usage of the existing src/common/ files
but didn't move anything around. I plan to stop here unless the
buildfarm shows more issues.

regards, tom lane