From 629188ede7ee00c925ef28b85b1e68fc9e05fb93 Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Tue, 28 Jan 2025 09:41:29 +0100
Subject: [PATCH] compat: introduce new "zlib.h" header

Introduce a new "compat/zlib-compat.h" header that we include instead of
including <zlib.h> directly. This will allow us to wire up zlib-ng as an
alternative backend for zlib compression in a subsequent commit.

Note that we cannot just call the file "compat/zlib.h", as that may
otherwise cause us to include that file instead of <zlib.h>.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 compat/zlib-compat.h | 6 ++++++
 git-compat-util.h    | 2 +-
 reftable/block.c     | 2 +-
 3 files changed, 8 insertions(+), 2 deletions(-)
 create mode 100644 compat/zlib-compat.h

diff --git a/compat/zlib-compat.h b/compat/zlib-compat.h
new file mode 100644
index 0000000000..bc20b884ef
--- /dev/null
+++ b/compat/zlib-compat.h
@@ -0,0 +1,6 @@
+#ifndef COMPAT_ZLIB_H
+#define COMPAT_ZLIB_H
+
+#include <zlib.h>
+
+#endif /* COMPAT_ZLIB_H */
diff --git a/git-compat-util.h b/git-compat-util.h
index c4b4b372b4..1ca2671322 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -1537,7 +1537,7 @@ int cmd_main(int, const char **);
 int common_exit(const char *file, int line, int code);
 #define exit(code) exit(common_exit(__FILE__, __LINE__, (code)))
 
-#include <zlib.h>
+#include "compat/zlib-compat.h"
 
 /*
  * This include must come after system headers, since it introduces macros that
diff --git a/reftable/block.c b/reftable/block.c
index 9858bbc7c5..bc9b079634 100644
--- a/reftable/block.c
+++ b/reftable/block.c
@@ -13,7 +13,7 @@ https://developers.google.com/open-source/licenses/bsd
 #include "record.h"
 #include "reftable-error.h"
 #include "system.h"
-#include <zlib.h>
+#include "compat/zlib-compat.h"
 
 int header_size(int version)
 {