From d2a1f3b23935db35dc04a6842b988bec28afadab Mon Sep 17 00:00:00 2001
From: Yann Collet <cyan@fb.com>
Date: Wed, 11 Nov 2020 00:32:49 -0800
Subject: fix cmake build of shared dll with visual

inspired from #891
---
 build/cmake/CMakeLists.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/build/cmake/CMakeLists.txt b/build/cmake/CMakeLists.txt
index 1bb2f5a..57501ee 100644
--- a/build/cmake/CMakeLists.txt
+++ b/build/cmake/CMakeLists.txt
@@ -107,6 +107,10 @@ if(BUILD_SHARED_LIBS)
     OUTPUT_NAME lz4
     SOVERSION "${LZ4_VERSION_MAJOR}"
     VERSION "${LZ4_VERSION_STRING}")
+  if(MSVC)
+    target_compile_definitions(lz4_shared PRIVATE
+      LZ4_DLL_EXPORT=1)
+  endif()
   list(APPEND LZ4_LIBRARIES_BUILT lz4_shared)
 endif()
 if(BUILD_STATIC_LIBS)
-- 
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