From 3eef7b7d55fa516a8992b13fafcb66d4fb4f3619 Mon Sep 17 00:00:00 2001
From: kai <kai@redstar.de>
Date: Wed, 13 Jun 2012 18:23:39 +0200
Subject: [PATCH] First attempt to create build files for MSVC.

---
 cmake/Modules/FindLLVM.cmake | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/cmake/Modules/FindLLVM.cmake b/cmake/Modules/FindLLVM.cmake
index a4c04fdc..4c243a3a 100644
--- a/cmake/Modules/FindLLVM.cmake
+++ b/cmake/Modules/FindLLVM.cmake
@@ -26,8 +26,24 @@ find_program(LLVM_CONFIG llvm-config ${LLVM_ROOT_DIR}/bin
     DOC "Path to llvm-config tool.")
 
 if (NOT LLVM_CONFIG)
-    if (NOT FIND_LLVM_QUIETLY)
-        message(WARNING "Could not find llvm-config. Consider manually setting LLVM_ROOT_DIR.")
+    if (WIN32)
+        # A bit of a sanity check:
+        if( NOT EXISTS ${LLVM_ROOT_DIR}/include/llvm )
+            message(FATAL_ERROR "LLVM_ROOT_DIR (${LLVM_ROOT_DIR}) is not a valid LLVM install")
+        endif()
+        # We incorporate the CMake features provided by LLVM:
+        set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${LLVM_ROOT_DIR}/share/llvm/cmake")
+        include(LLVMConfig)
+        # Set properties
+        set(LLVM_HOST_TARGET ${TARGET_TRIPLE})
+        set(LLVM_VERSION_STRING ${LLVM_PACKAGE_VERSION})
+        set(LLVM_CXXFLAGS ${LLVM_DEFINITIONS})
+        set(LLVM_LDFLAGS "")
+        llvm_map_components_to_libraries(LLVM_LIBRARIES ${LLVM_FIND_COMPONENTS})
+    else()
+        if (NOT FIND_LLVM_QUIETLY)
+            message(WARNING "Could not find llvm-config. Consider manually setting LLVM_ROOT_DIR.")
+        endif()
     endif()
 else()
     # llvm-config is written in Perl, thus we need to locate it first.