From f79faf9008c8e4c5539780e712012c55ab1b3cfc Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Sat, 11 Apr 2020 22:09:17 -0400
Subject: [PATCH] cmake: allow not finding some clang libs

partial revert of aaf99371b22e816a4162391d799b9d22bba21120
because it broke the build for some people
---
 cmake/Findclang.cmake | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/cmake/Findclang.cmake b/cmake/Findclang.cmake
index c556455d1c..5f5bef8207 100644
--- a/cmake/Findclang.cmake
+++ b/cmake/Findclang.cmake
@@ -48,7 +48,9 @@ else()
         /c/msys64/mingw64/lib
         c:\\msys64\\mingw64\\lib
     )
-    set(CLANG_LIBRARIES ${CLANG_LIBRARIES} ${CLANG_${_prettylibname_}_LIB})
+    if(CLANG_${_prettylibname_}_LIB)
+      set(CLANG_LIBRARIES ${CLANG_LIBRARIES} ${CLANG_${_prettylibname_}_LIB})
+    endif()
   endmacro(FIND_AND_ADD_CLANG_LIB)
 
   FIND_AND_ADD_CLANG_LIB(clangFrontendTool)