[PATCH] Allow users of the llvm install directory to specify a path to lit.

[Greg Fitzgerald]

Hi chapuni,

With this patch, the user can either set LLVM_LIT directory or use CMAKE_PREFIX_PATH=<llvm_install_dir> and CMake's find_program will find llvm-lit.

http://reviews.llvm.org/D3429

Files:
  cmake/modules/AddLLVM.cmake

Index: cmake/modules/AddLLVM.cmake
===================================================================
--- cmake/modules/AddLLVM.cmake
+++ cmake/modules/AddLLVM.cmake
@@ -632,11 +632,15 @@
   if (NOT CMAKE_CFG_INTDIR STREQUAL ".")
     list(APPEND LIT_ARGS --param build_mode=${CMAKE_CFG_INTDIR})
   endif ()
-  set(LIT_COMMAND
-    ${PYTHON_EXECUTABLE}
-    ${LLVM_MAIN_SRC_DIR}/utils/lit/lit.py
-    ${LIT_ARGS}
-    )
+  if (NOT LLVM_LIT)
+    find_program(LLVM_LIT llvm-lit)
+  endif()
+  if (LLVM_LIT)
+    set (LIT_COMMAND "${LLVM_LIT}")
+  else ()
+    set (LIT_COMMAND "${PYTHON_EXECUTABLE} ${LLVM_MAIN_SRC_DIR}/utils/lit/lit.py")
+  endif ()
+  list(APPEND LIT_COMMAND ${LIT_ARGS})
   foreach(param ${ARG_PARAMS})
     list(APPEND LIT_COMMAND --param ${param})
   endforeach()
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