[CMake] Make CMAKE_INSTALL_RPATH work again

r285714 made it so that when CMAKE_INSTALL_RPATH is set _install_rpath is not
set, but that means INSTALL_RPATH gets set to an empty string which isn't what
we want. Fix this by setting INSTALL_RPATH only when _install_rpath is set.

llvm-svn: 285908

diff --git a/llvm/cmake/modules/AddLLVM.cmake b/llvm/cmake/modules/AddLLVM.cmake
index 32ef66ab7c49cabf362f8d1ba1c568eee4a48ec8..238b8810f420ea0783387700487a5f0fe20a2e4a 100644 (file)
--- a/llvm/cmake/modules/AddLLVM.cmake
+++ b/llvm/cmake/modules/AddLLVM.cmake
@@ -1351,8 +1351,10 @@ function(llvm_setup_rpath name)
     return()
   endif()
 
-  set_target_properties(${name} PROPERTIES
-                        BUILD_WITH_INSTALL_RPATH On
-                        INSTALL_RPATH "${_install_rpath}"
-                        ${_install_name_dir})
+  if(DEFINED _install_rpath)
+    set_target_properties(${name} PROPERTIES
+                          BUILD_WITH_INSTALL_RPATH On
+                          INSTALL_RPATH "${_install_rpath}"
+                          ${_install_name_dir})
+  endif()
 endfunction()