From d6128fd27aa504957bc154074414946d001d6412 Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Thu, 23 Apr 2026 23:23:49 +0300
Subject: [PATCH] compress: fix veb: unable to compile with clang (fixes
 #26936)

---
 vlib/compress/zstd/zstd.c.v                          | 12 ++++++------
 .../gen/c/testdata/zstd_opaque_ctx_tags.c.must_have  |  4 ++++
 vlib/v/gen/c/testdata/zstd_opaque_ctx_tags.vv        | 12 ++++++++++++
 3 files changed, 22 insertions(+), 6 deletions(-)
 create mode 100644 vlib/v/gen/c/testdata/zstd_opaque_ctx_tags.c.must_have
 create mode 100644 vlib/v/gen/c/testdata/zstd_opaque_ctx_tags.vv

diff --git a/vlib/compress/zstd/zstd.c.v b/vlib/compress/zstd/zstd.c.v
index 4ea2ffa93..86c713be1 100644
--- a/vlib/compress/zstd/zstd.c.v
+++ b/vlib/compress/zstd/zstd.c.v
@@ -28,10 +28,10 @@ fn C.ZSTD_getErrorName(usize) charptr
 fn C.ZSTD_minCLevel() i32
 fn C.ZSTD_maxCLevel() i32
 fn C.ZSTD_defaultCLevel() i32
-fn C.ZSTD_createCCtx() &C.ZSTD_CCtx
+fn C.ZSTD_createCCtx() &C.ZSTD_CCtx_s
 fn C.ZSTD_freeCCtx(voidptr) usize
 fn C.ZSTD_compressCCtx(voidptr, voidptr, usize, voidptr, usize, i32) usize
-fn C.ZSTD_createDCtx() &C.ZSTD_DCtx
+fn C.ZSTD_createDCtx() &C.ZSTD_DCtx_s
 fn C.ZSTD_freeDCtx(voidptr) usize
 fn C.ZSTD_decompressDCtx(voidptr, voidptr, usize, voidptr, usize) usize
 
@@ -455,7 +455,7 @@ pub fn decompress(data []u8, params DecompressParams) ![]u8 {
 
 pub struct CCtx {
 mut:
-	ctx &C.ZSTD_CCtx
+	ctx &C.ZSTD_CCtx_s
 }
 
 // new_cctx create a compression context.
@@ -497,13 +497,13 @@ pub fn (mut c CCtx) free_cctx() usize {
 	return C.ZSTD_freeCCtx(c.ctx)
 }
 
-struct C.ZSTD_CCtx {}
+struct C.ZSTD_CCtx_s {}
 
-struct C.ZSTD_DCtx {}
+struct C.ZSTD_DCtx_s {}
 
 pub struct DCtx {
 mut:
-	ctx &C.ZSTD_DCtx
+	ctx &C.ZSTD_DCtx_s
 }
 
 // new_dctx creates a decompression context.
diff --git a/vlib/v/gen/c/testdata/zstd_opaque_ctx_tags.c.must_have b/vlib/v/gen/c/testdata/zstd_opaque_ctx_tags.c.must_have
new file mode 100644
index 000000000..0145fc69f
--- /dev/null
+++ b/vlib/v/gen/c/testdata/zstd_opaque_ctx_tags.c.must_have
@@ -0,0 +1,4 @@
+struct ZSTD_CCtx_s* ctx;
+struct ZSTD_DCtx_s* ctx;
+struct ZSTD_CCtx_s* ctx = ZSTD_createCCtx();
+struct ZSTD_DCtx_s* ctx = ZSTD_createDCtx();
diff --git a/vlib/v/gen/c/testdata/zstd_opaque_ctx_tags.vv b/vlib/v/gen/c/testdata/zstd_opaque_ctx_tags.vv
new file mode 100644
index 000000000..1be7b9803
--- /dev/null
+++ b/vlib/v/gen/c/testdata/zstd_opaque_ctx_tags.vv
@@ -0,0 +1,12 @@
+import compress.zstd
+
+fn main() {
+	mut cctx := zstd.new_cctx() or { panic(err) }
+	defer {
+		cctx.free_cctx()
+	}
+	mut dctx := zstd.new_dctx() or { panic(err) }
+	defer {
+		dctx.free_dctx()
+	}
+}
-- 
2.39.5