Re: Add LZ4 compression in pg_dump

On Sat, Mar 26, 2022 at 11:21:56AM -0500, Justin Pryzby wrote:
> You're passing both the compression method *and* level.  I think there should
> be a structure which includes both.  In the future, that can also handle
> additional options.

I'm not sure if there's anything worth saving, but I did that last year with
0003-Support-multiple-compression-algs-levels-opts.patch
I sent a rebased copy off-list.
https://www.postgresql.org/message-id/flat/20210104025321.GA9712@telsasoft.com#ca1b9f9d3552c87fa874731cad9d8391

|    fatal("not built with LZ4 support");
|    fatal("not built with lz4 support");

Please use consistent capitalization of "lz4" - then the compiler can optimize
away duplicate strings.

> 0004: The include should use <lz4.h> and not "lz4.h"

Also, use USE_LZ4 rather than HAVE_LIBLZ4, per 75eae0908.