[offload] Fix path to llvm-offload-device-info in standalone build

Fix path to `llvm-offload-device-info` tool in standalone build.
This tool is built as part of offload, so rather than looking it up
as a preinstalled tool, set correct `LLVM_RUNTIME_OUTPUT_INTDIR`
for the `llvm_add_tool()` call, and unconditionally set
`OFFLOAD_DEVICE_INFO_EXECUTABLE` using that directory.

Author: mgorny

offload/CMakeLists.txt

@@ -64,6 +64,9 @@ if (OPENMP_STANDALONE_BUILD)
   # Do not use OPENMP_LIBDIR_SUFFIX directly, use OPENMP_INSTALL_LIBDIR.
   set(OPENMP_INSTALL_LIBDIR "lib${OPENMP_LIBDIR_SUFFIX}")
 
+  # Used by llvm_add_tool() and tests.
+  set(LLVM_RUNTIME_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR})
+
   # Group test settings.
   set(OPENMP_TEST_C_COMPILER ${CMAKE_C_COMPILER} CACHE STRING
     "C compiler to use for testing OpenMP runtime libraries.")

offload/cmake/OpenMPTesting.cmake

@@ -37,17 +37,6 @@ function(find_standalone_test_dependencies)
     return()
   endif()
 
-  find_program(OFFLOAD_DEVICE_INFO_EXECUTABLE
-    NAMES llvm-offload-device-info
-    PATHS ${OPENMP_LLVM_TOOLS_DIR})
-  if (NOT OFFLOAD_DEVICE_INFO_EXECUTABLE)
-    message(STATUS "Cannot find 'llvm-offload-device-info'.")
-    message(STATUS "Please put 'not' in your PATH, set OFFLOAD_DEVICE_INFO_EXECUTABLE to its full path, or point OPENMP_LLVM_TOOLS_DIR to its directory.")
-    message(WARNING "The check targets will not be available!")
-    set(ENABLE_CHECK_TARGETS FALSE PARENT_SCOPE)
-    return()
-  endif()
-
   find_program(OPENMP_NOT_EXECUTABLE
     NAMES not
     PATHS ${OPENMP_LLVM_TOOLS_DIR})
@@ -82,8 +71,8 @@ else()
     set(OPENMP_FILECHECK_EXECUTABLE ${LLVM_RUNTIME_OUTPUT_INTDIR}/FileCheck)
   endif()
   set(OPENMP_NOT_EXECUTABLE ${LLVM_RUNTIME_OUTPUT_INTDIR}/not)
-  set(OFFLOAD_DEVICE_INFO_EXECUTABLE ${LLVM_RUNTIME_OUTPUT_INTDIR}/llvm-offload-device-info)
 endif()
+set(OFFLOAD_DEVICE_INFO_EXECUTABLE ${LLVM_RUNTIME_OUTPUT_INTDIR}/llvm-offload-device-info)
 
 # Macro to extract information about compiler from file. (no own scope)
 macro(extract_test_compiler_information lang file)