[Openmp-commits] [openmp] [OpenMP] Fix LLVM_ENABLE_PROJECTS=openmp build (PR #151117)

[Madhur Amilkanthwar via Openmp-commits]

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@@ -48,6 +50,15 @@ if (OPENMP_STANDALONE_BUILD)
   set(CMAKE_CXX_STANDARD_REQUIRED NO)
   set(CMAKE_CXX_EXTENSIONS NO)
 else()
+  # Usually <llvm-project>/runtimes/CMakeLists.txt sets LLVM_TREE_AVAILABLE and
+  # we assume it is not available otherwise. The exception is that we are in an
+  # LLVM_ENABLE_PROJECTS=openmp build, the LLVM tree is actually available.
+  # Note that this build mode has been deprecated.
+  # See https://github.com/llvm/llvm-project/issues/124014
+  if (NOT LLVM_RUNTIMES_BUILD AND "openmp" IN_LIST LLVM_ENABLE_PROJECTS)
+    set(LLVM_TREE_AVAILABLE True)
+  endif ()
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madhur13490 wrote:

I am not an expert in build infrastructure of OpenMP in LLVM, but if we say the mode is deprecated, then why should we continue making changes in the code and keep supporting it? Let's update the documents and fully deprecate `LLVM_ENABLE_PROJECTS=openmp`?

https://github.com/llvm/llvm-project/pull/151117