commit c0be37352f6d91505d964a7d33ad79b40750d370
Author: Keno Fischer <keno@juliacomputing.com>
Date:   Fri Aug 3 21:03:32 2018 -0400

    [CrossCompile] Add a dependency llvm-config-host -> llvm-tblgen-host
    
    These use the same working directory and without a dependency
    edge between them race to build some of the utility libraries
    causing build failures.

diff --git a/tools/llvm-config/CMakeLists.txt b/tools/llvm-config/CMakeLists.txt
index f59402ac4b0..f3b4e60fd99 100644
--- a/tools/llvm-config/CMakeLists.txt
+++ b/tools/llvm-config/CMakeLists.txt
@@ -77,5 +77,10 @@ if(CMAKE_CROSSCOMPILING AND NOT LLVM_CONFIG_PATH)
   add_custom_target(${project}NativeLLVMConfig DEPENDS ${${project}_LLVM_CONFIG_EXE})
   add_dependencies(${project}NativeLLVMConfig CONFIGURE_LLVM_NATIVE)
 
+  # Add a dependency on the host tblgen, which uses the same working
+  # directory and with which we're otherwise racing to build some
+  # of the utility libraries.
+  add_dependencies(${project}NativeLLVMConfig LLVM-tablegen-host)
+
   add_dependencies(llvm-config ${project}NativeLLVMConfig)
 endif(CMAKE_CROSSCOMPILING)