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Improve const use in zlib-using code

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If we define ZLIB_CONST before including zlib.h, zlib augments some
interfaces with const decorations.  By doing that we can keep our own
interfaces cleaner and can remove some unconstify calls.

ZLIB_CONST was introduced in zlib 1.2.5.2 (17 Dec 2011).  When
compiling with older zlib releases, you might now get compiler
warnings about discarding qualifiers.

CentOS 6 has zlib 1.2.3, but in 8e278b6576, we removed support for the
OpenSSL release in CentOS 6, so it seems ok to de-support the zlib
release in CentOS 6 as well.

Reviewed-by: Tristan Partin <tristan@neon.tech>
Discussion: https://www.postgresql.org/message-id/flat/33462926-bb1e-7cc9-8d92-d86318e8ed1d%40eisentraut.org
This commit is contained in:
Peter Eisentraut
2023-08-07 09:06:52 +02:00
parent fdd79d8992
commit 67c0ef9752
4 changed files with 9 additions and 5 deletions
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2
contrib/pgcrypto/pgp-compress.c
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@ -113,7 +113,7 @@ compress_process(PushFilter *next, void *priv, const uint8 *data, int len)
/*
* process data
*/
st->stream.next_in = unconstify(uint8 *, data);
st->stream.next_in = data;
st->stream.avail_in = len;
while (st->stream.avail_in > 0)
{