Merging r371733:

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r371733 | mgorny | 2019-09-12 06:06:12 -0700 (Thu, 12 Sep 2019) | 7 lines

[clang] [unittest] Import LLVMTestingSupport if necessary

Add LLVMTestingSupport directory from LLVM_MAIN_SRC_DIR when building
clang stand-alone and LLVMTestingSupport library is not present.  This
is needed to fix stand-alone builds without clang-tools-extra.

Differential Revision: https://reviews.llvm.org/D67452
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Author: mgorny

clang/unittests/CMakeLists.txt

@@ -1,6 +1,15 @@
 add_custom_target(ClangUnitTests)
 set_target_properties(ClangUnitTests PROPERTIES FOLDER "Clang tests")
 
+if(CLANG_BUILT_STANDALONE)
+  # LLVMTestingSupport library is needed for some of the unittests.
+  if (EXISTS ${LLVM_MAIN_SRC_DIR}/lib/Testing/Support
+      AND NOT TARGET LLVMTestingSupport)
+    add_subdirectory(${LLVM_MAIN_SRC_DIR}/lib/Testing/Support
+      lib/Testing/Support)
+  endif()
+endif()
+
 # add_clang_unittest(test_dirname file1.cpp file2.cpp)
 #
 # Will compile the list of files together and link against the clang