From edb3c5f6c671acd856fd99fd066ce67b0f6ba16a Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Thu, 26 Feb 2026 22:04:48 +0300
Subject: [PATCH] compress: fix compilation fails because of multiple includes
 of same .h (fixes #18378)

---
 vlib/compress/compress.c.v                          |  1 +
 vlib/compress/szip/szip.c.v                         |  1 +
 .../zlib/zlib_miniz_compat_names_collision.h        | 13 +++++++++++++
 .../zlib/zlib_miniz_compat_names_collision_test.c.v |  7 +++++++
 4 files changed, 22 insertions(+)
 create mode 100644 vlib/compress/zlib/zlib_miniz_compat_names_collision.h
 create mode 100644 vlib/compress/zlib/zlib_miniz_compat_names_collision_test.c.v

diff --git a/vlib/compress/compress.c.v b/vlib/compress/compress.c.v
index 46a26895e..329e5d906 100644
--- a/vlib/compress/compress.c.v
+++ b/vlib/compress/compress.c.v
@@ -1,6 +1,7 @@
 module compress
 
 #flag -I @VEXEROOT/thirdparty/zip
+#define MINIZ_NO_ZLIB_COMPATIBLE_NAMES
 #include "miniz.h"
 
 pub const max_size = u64(1 << 31)
diff --git a/vlib/compress/szip/szip.c.v b/vlib/compress/szip/szip.c.v
index 8c68c659e..bc2ee6e59 100644
--- a/vlib/compress/szip/szip.c.v
+++ b/vlib/compress/szip/szip.c.v
@@ -3,6 +3,7 @@ module szip
 import os
 
 #flag -I @VEXEROOT/thirdparty/zip
+#define MINIZ_NO_ZLIB_COMPATIBLE_NAMES
 #include "zip.c"
 
 @[params]
diff --git a/vlib/compress/zlib/zlib_miniz_compat_names_collision.h b/vlib/compress/zlib/zlib_miniz_compat_names_collision.h
new file mode 100644
index 000000000..850471081
--- /dev/null
+++ b/vlib/compress/zlib/zlib_miniz_compat_names_collision.h
@@ -0,0 +1,13 @@
+#ifndef ISSUE_18378_ZLIB_COMPAT_H
+#define ISSUE_18378_ZLIB_COMPAT_H
+
+typedef void *voidpf;
+typedef unsigned int uInt;
+
+typedef struct issue_18378_z_stream_s {
+	int dummy;
+} z_stream;
+
+typedef voidpf (*alloc_func)(voidpf opaque, uInt items, uInt size);
+
+#endif
diff --git a/vlib/compress/zlib/zlib_miniz_compat_names_collision_test.c.v b/vlib/compress/zlib/zlib_miniz_compat_names_collision_test.c.v
new file mode 100644
index 000000000..101ac73ae
--- /dev/null
+++ b/vlib/compress/zlib/zlib_miniz_compat_names_collision_test.c.v
@@ -0,0 +1,7 @@
+module zlib
+
+#include "@DIR/zlib_miniz_compat_names_collision.h"
+
+fn test_issue_18378_multiple_headers_do_not_conflict() {
+	assert true
+}
-- 
2.39.5