From 2e75681b55ab55301022533b203269f5f3d6f909 Mon Sep 17 00:00:00 2001
From: Eric Christopher <echristo@gmail.com>
Date: Mon, 2 Dec 2019 14:30:16 -0800
Subject: [PATCH] Temporarily revert "build: avoid hardcoding the libxml2
 library name" as it breaks uses of llvm-config --system-libs and the
 follow-on commit "build: avoid cached literals being linked against"

This reverts commits 340e7c0b77a7037afefe7255503afe362967b577 and
340e7c0b77a7037afefe7255503afe362967b577.
---
 llvm/cmake/config-ix.cmake              |  1 +
 llvm/lib/WindowsManifest/CMakeLists.txt | 18 ++++++++++++------
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/llvm/cmake/config-ix.cmake b/llvm/cmake/config-ix.cmake
index e7e5e5dcf2ff..028a2cc86bf3 100644
--- a/llvm/cmake/config-ix.cmake
+++ b/llvm/cmake/config-ix.cmake
@@ -166,6 +166,7 @@ if(NOT LLVM_USE_SANITIZER MATCHES "Memory.*")
         else()
           include_directories(${LIBXML2_INCLUDE_DIR})
         endif()
+        set(LIBXML2_LIBS "xml2")
       endif()
     endif()
   endif()
diff --git a/llvm/lib/WindowsManifest/CMakeLists.txt b/llvm/lib/WindowsManifest/CMakeLists.txt
index fe6ddcd414d5..4f2d011d5434 100644
--- a/llvm/lib/WindowsManifest/CMakeLists.txt
+++ b/llvm/lib/WindowsManifest/CMakeLists.txt
@@ -1,12 +1,18 @@
+set(system_libs)
+if( CMAKE_HOST_UNIX )
+  if( LLVM_LIBXML2_ENABLED )
+    set(system_libs ${system_libs} ${LIBXML2_LIBS})
+  endif()
+endif()
+
 add_llvm_component_library(LLVMWindowsManifest
   WindowsManifestMerger.cpp
 
   ADDITIONAL_HEADER_DIRS
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/WindowsManifest
-  ${Backtrace_INCLUDE_DIRS})
+  ${Backtrace_INCLUDE_DIRS}
 
-if(LIBXML2_LIBRARIES)
-  target_link_libraries(LLVMWindowsManifest PUBLIC ${LIBXML2_LIBRARIES})
-  set_property(TARGET LLVMWindowsManifest PROPERTY
-    LLVM_SYSTEM_LIBS ${LIBXML2_LIBRARIES})
-endif()
+  LINK_LIBS ${system_libs}
+  )
+
+set_property(TARGET LLVMWindowsManifest PROPERTY LLVM_SYSTEM_LIBS "${system_libs}")