[PATCH] Allow external projects to run tests via llvm-lit

[Greg Fitzgerald]

test if variable is set instead of testing if directory exists

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 +632,12 @@
   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 (LLVM_MAIN_SRC_DIR)
+    set (LIT_COMMAND ${PYTHON_EXECUTABLE} ${LLVM_MAIN_SRC_DIR}/utils/lit/lit.py)
+  else()
+    find_program(LIT_COMMAND llvm-lit)
+  endif ()
+  list(APPEND LIT_COMMAND ${LIT_ARGS})
   foreach(param ${ARG_PARAMS})
     list(APPEND LIT_COMMAND --param ${param})
   endforeach()
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