From 2d9a61bd0e66837fec5fee1f3d4d848a26a32593 Mon Sep 17 00:00:00 2001
From: "Admiral H. Curtiss" <pikachu025@gmail.com>
Date: Wed, 30 Apr 2025 20:31:49 +0200
Subject: [PATCH] Externals/zstd: Disable ASM for MSVC compiler in CMake

Results in a "MSVC_RUNTIME_LIBRARY value 'MultiThreadedDLL' not known for this ASM compiler" otherwise, and zstd doesn't support the relevant ASM code for MSVC anyway.
---
 Externals/zstd/CMakeLists.txt | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/Externals/zstd/CMakeLists.txt b/Externals/zstd/CMakeLists.txt
index f89514a7b9..335ad06abf 100644
--- a/Externals/zstd/CMakeLists.txt
+++ b/Externals/zstd/CMakeLists.txt
@@ -1,4 +1,8 @@
-project(zstd C ASM)
+project(zstd C)
+
+if(NOT MSVC)
+    enable_language(ASM)
+endif()
 
 include(CheckTypeSize)
 include(CheckFunctionExists)
@@ -120,7 +124,6 @@ set(ZSTD_SRCS
     zstd/lib/compress/zstd_preSplit.c
     zstd/lib/compress/zstdmt_compress.c
     zstd/lib/decompress/huf_decompress.c
-    zstd/lib/decompress/huf_decompress_amd64.S
     zstd/lib/decompress/zstd_ddict.c
     zstd/lib/decompress/zstd_decompress.c
     zstd/lib/decompress/zstd_decompress_block.c
@@ -129,6 +132,12 @@ set(ZSTD_SRCS
 add_library(zstd STATIC ${ZSTD_SRCS} ${ZSTD_PUBLIC_HDRS} ${ZSTD_PRIVATE_HDRS})
 target_compile_definitions(zstd PUBLIC ZSTD_LEGACY_SUPPORT=0)
 
+if(MSVC)
+    target_compile_definitions(zstd PUBLIC ZSTD_DISABLE_ASM)
+else()
+    target_sources(zstd PRIVATE zstd/lib/decompress/huf_decompress_amd64.S)
+endif()
+
 dolphin_disable_warnings(zstd)
 add_library(zstd::zstd ALIAS zstd)