From 8e6bb7d61653b340a7be04f3d12b7fdb7af196e4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mateusz=20Miku=C5=82a?= <mati865@gmail.com>
Date: Sat, 12 Sep 2020 22:00:42 +0300
Subject: [PATCH] [MinGW] Use lib prefix for libraries

In MinGW world, UNIX like lib prefix is preferred for the libraries.
This patch adjusts CMake files to do that.

Differential Revision: https://reviews.llvm.org/D87517
---
 cmake/modules/AddLLVM.cmake       | 2 +-
 tools/llvm-config/llvm-config.cpp | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
index a40cf17426f..e57abea4275 100644
--- a/cmake/modules/AddLLVM.cmake
+++ b/cmake/modules/AddLLVM.cmake
@@ -567,7 +567,7 @@ function(llvm_add_library name)
   endif()
 
   if(ARG_SHARED)
-    if(WIN32)
+    if(MSVC)
       set_target_properties(${name} PROPERTIES
         PREFIX ""
         )
diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
index a9d3f64aaa5..1a2f04552d1 100644
--- a/tools/llvm-config/llvm-config.cpp
+++ b/tools/llvm-config/llvm-config.cpp
@@ -381,6 +381,7 @@ int main(int argc, char **argv) {
     SharedExt = "dll";
     SharedVersionedExt = LLVM_DYLIB_VERSION ".dll";
     if (HostTriple.isOSCygMing()) {
+      SharedPrefix = "lib";
       StaticExt = "a";
       StaticPrefix = "lib";
     } else {