[OpenMP] Fix LLVM_ENABLE_PROJECTS=openmp build#151117
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| # 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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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?
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Deprecation is just a notice that it is going to be removed to encourage users to move away from it. Until it really is removed, is should still work (or why would one keep non-working code around?).
kshitijvp
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Jan 9, 2026
The build mode has been deprecated in llvm#136314. According to the deprecation message, it was supposed to be removed in the LLVM 21 release. Each build mode increased the maintanance overhead when failing, such as in llvm#151117. Let's remove it in LLVM 22.
Priyanshu3820
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Jan 18, 2026
The build mode has been deprecated in llvm#136314. According to the deprecation message, it was supposed to be removed in the LLVM 21 release. Each build mode increased the maintanance overhead when failing, such as in llvm#151117. Let's remove it in LLVM 22.
tbaederr
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Jan 20, 2026
Reapply llvm#152189 which was reverted because it broke publish-sphinx-docs. The build mode has been deprecated in llvm#136314. According to the deprecation message, it was supposed to be removed in the LLVM 21 release. Each build mode increased the maintanance overhead when failing, such as in llvm#151117.
BStott6
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Jan 22, 2026
Reapply llvm#152189 which was reverted because it broke publish-sphinx-docs. The build mode has been deprecated in llvm#136314. According to the deprecation message, it was supposed to be removed in the LLVM 21 release. Each build mode increased the maintanance overhead when failing, such as in llvm#151117.
Meinersbur
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Reapply #152189 and #174963 which were reverted because it broke publish-sphinx-docs and publish-doxygen-docs. The build mode has been deprecated in #136314 and was supposed to be removed in the LLVM 21 release (#136314). OpenMP currently supports 4 build modes: * `cmake <llvm-project>/llvm -DLLVM_ENABLE_PROJECTS=openmp` * `cmake <llvm-project>/llvm -DLLVM_ENABLE_RUNTIMES=openmp` (bootstrapping build) * `cmake <llvm-project>/openmp` (standalone build) * `cmake <llvm-project>/runtimes -DLLVM_ENABLE_RUNTIMES=openmp` (runtimes default/standalone build) Each build mode increased the maintanance overhead since all build modes must continue working and user confusion when there do not (see #151117, #174126, #154117, ...). Let's finally remove it.
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Set LLVM_TREE_AVAILABLE when not defined after #149871. In particular, the LLVM build tree is obviously available with
add_subdirectory(openmp)from the LLVM build tree itself. Note that this build mode is deprecated since #136314.