From 8bda7ff0c8d31a868e126aca17a41bceb5e0dd35 Mon Sep 17 00:00:00 2001
From: David Nadlinger <code@klickverbot.at>
Date: Wed, 13 Feb 2013 16:00:08 +0100
Subject: [PATCH] MinGW LLVM compiler flag fixes.

Our CMake code should be rewritten to not expect things as strings
that really aren't, but this would entail a whole lot of cross-
platform testing, so I'm postponing it for now.
---
 cmake/Modules/FindLLVM.cmake | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/cmake/Modules/FindLLVM.cmake b/cmake/Modules/FindLLVM.cmake
index 47fea36f..d984fb97 100644
--- a/cmake/Modules/FindLLVM.cmake
+++ b/cmake/Modules/FindLLVM.cmake
@@ -42,10 +42,25 @@ if (NOT LLVM_CONFIG)
         list(REMOVE_ITEM LLVM_FIND_COMPONENTS "all-targets" index)
         list(APPEND LLVM_FIND_COMPONENTS ${LLVM_TARGETS_TO_BUILD})
         list(REMOVE_ITEM LLVM_FIND_COMPONENTS "backend" index)
+
         llvm_map_components_to_libraries(tmplibs ${LLVM_FIND_COMPONENTS})
-        foreach(lib ${tmplibs})
-            list(APPEND LLVM_LIBRARIES "${LLVM_LIBRARY_DIRS}/${CMAKE_STATIC_LIBRARY_PREFIX}${lib}${CMAKE_STATIC_LIBRARY_SUFFIX}")
-        endforeach()
+        if(MSVC)
+            foreach(lib ${tmplibs})
+                list(APPEND LLVM_LIBRARIES "${LLVM_LIBRARY_DIRS}/${CMAKE_STATIC_LIBRARY_PREFIX}${lib}${CMAKE_STATIC_LIBRARY_SUFFIX}")
+            endforeach()
+        else()
+            # Rely on the library search path being set correctly via -L on
+            # MinGW and others, as the library list returned by
+            # llvm_map_components_to_libraries also includes imagehlp and psapi.
+            set(LLVM_LDFLAGS "-L${LLVM_LIBRARY_DIRS}")
+            set(LLVM_LIBRARIES ${tmplibs})
+
+            # When using the CMake LLVM module, LLVM_DEFINITIONS is a list
+            # instead of a string. Later, the list seperators would entirely
+            # disappear, replace them by spaces instead. A better fix would be
+            # to switch to add_definitions() instead of throwing strings around.
+            string(REPLACE ";" " " LLVM_CXXFLAGS "${LLVM_CXXFLAGS}")
+        endif()
     else()
         if (NOT FIND_LLVM_QUIETLY)
             message(WARNING "Could not find llvm-config. Try manually setting LLVM_CONFIG to the llvm-config executable of the installation to use.")