[all-commits] [llvm/llvm-project] cfcfd8: build: avoid cached literals being linked against

[Saleem Abdulrasool via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: cfcfd8a056eb7c01bc76b745ce9f7839f0dcbc42
      https://github.com/llvm/llvm-project/commit/cfcfd8a056eb7c01bc76b745ce9f7839f0dcbc42
  Author: Saleem Abdulrasool <compnerd at compnerd.org>
  Date:   2019-11-27 (Wed, 27 Nov 2019)

  Changed paths:
    M llvm/lib/WindowsManifest/CMakeLists.txt

  Log Message:
  -----------
  build: avoid cached literals being linked against

If the value of the LibXml2 search is cached, it can cause an errant
link against LIBXML2_LIBRARIES-NOTFOUND if libxml2 is not found. Add
a guard against this.  Should repair the build bots.