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[llvm][cmake] Turn runtime in PROJECTS warnings into FATAL_ERROR #152302

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[llvm][cmake] Turn runtime in PROJECTS warnings into FATAL_ERROR #152302

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afc78ab
[llvm][cmake] Turn runtime in PROJECTS warnings into FATAL_ERROR
DavidSpickett Aug 6, 2025
a721769
Add release note and updated docs
DavidSpickett Aug 6, 2025
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24 changes: 7 additions & 17 deletions llvm/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -180,29 +180,20 @@ if ("flang" IN_LIST LLVM_ENABLE_PROJECTS)
endif()

if ("libc" IN_LIST LLVM_ENABLE_PROJECTS)
message(WARNING "Using LLVM_ENABLE_PROJECTS=libc is deprecated. Please use "
message(FATAL_ERROR "Using LLVM_ENABLE_PROJECTS=libc is no longer supported. Please use "
"-DLLVM_ENABLE_RUNTIMES=libc or see the instructions at "
"https://libc.llvm.org/ for building the runtimes.")
endif()

if ("compiler-rt" IN_LIST LLVM_ENABLE_PROJECTS)
message(WARNING "Using LLVM_ENABLE_PROJECTS=compiler-rt is deprecated now, and will "
"become a fatal error in the LLVM 21 release. Please use "
"-DLLVM_ENABLE_RUNTIMES=compiler-rt or see the instructions at "
message(FATAL_ERROR "Using LLVM_ENABLE_PROJECTS=compiler-rt is no longer supported. "
"Please use -DLLVM_ENABLE_RUNTIMES=compiler-rt or see the instructions at "
"https://compiler-rt.llvm.org/ for building the runtimes.")
endif()

if ("offload" IN_LIST LLVM_ENABLE_PROJECTS)
message(WARNING "Using LLVM_ENABLE_PROJECTS=offload is deprecated now, and will "
"become a fatal error in the LLVM 21 release. Please use "
"-DLLVM_ENABLE_RUNTIMES=offload or see the instructions at "
"https://openmp.llvm.org/ for building the runtimes.")
endif()

if ("openmp" IN_LIST LLVM_ENABLE_PROJECTS)
message(WARNING "Using LLVM_ENABLE_PROJECTS=openmp is deprecated now, and will "
"become a fatal error in the LLVM 21 release. Please use "
"-DLLVM_ENABLE_RUNTIMES=openmp or see the instructions at "
message(FATAL_ERROR "Using LLVM_ENABLE_PROJECTS=openmp is no longer supported. "
"Please use -DLLVM_ENABLE_RUNTIMES=openmp or see the instructions at "
"https://openmp.llvm.org/ for building the runtimes.")
endif()

Expand All @@ -213,9 +204,8 @@ if ("flang-rt" IN_LIST LLVM_ENABLE_RUNTIMES)
endif ()

if ("libclc" IN_LIST LLVM_ENABLE_PROJECTS)
message(WARNING "Using LLVM_ENABLE_PROJECTS=libclc is deprecated now, and will "
"become a fatal error in the LLVM 21 release. Please use "
"-DLLVM_ENABLE_RUNTIMES=libclc or see the instructions at "
message(FATAL_ERROR "Using LLVM_ENABLE_PROJECTS=libclc is no longer supported. "
"Please use -DLLVM_ENABLE_RUNTIMES=libclc or see the instructions at "
"https://libclc.llvm.org/ for building the runtimes.")
endif()

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9 changes: 2 additions & 7 deletions llvm/docs/CMake.rst
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Expand Up @@ -595,12 +595,7 @@ enabled sub-projects. Nearly all of these variable names begin with

The full list is:

``bolt;clang;clang-tools-extra;compiler-rt;cross-project-tests;libc;libclc;lld;lldb;mlir;openmp;polly``

.. note::
Some projects listed here can also go in ``LLVM_ENABLE_RUNTIMES``. They
should only appear in one of the two lists. If a project is a valid possibility
for both, prefer putting it in ``LLVM_ENABLE_RUNTIMES``.
``bolt;clang;clang-tools-extra;cross-project-tests;lld;lldb;mlir;polly``

**LLVM_ENABLE_RTTI**:BOOL
Build LLVM with run-time type information. Defaults to OFF.
Expand All @@ -617,7 +612,7 @@ enabled sub-projects. Nearly all of these variable names begin with

The full list is:

``libc;libunwind;libcxxabi;libcxx;compiler-rt;openmp;llvm-libgcc;offload``
``libc;libclc;libunwind;libcxxabi;libcxx;compiler-rt;openmp;llvm-libgcc;offload``

To enable all of them, use:

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5 changes: 5 additions & 0 deletions llvm/docs/ReleaseNotes.md
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Expand Up @@ -90,6 +90,11 @@ Changes to LLVM infrastructure
Changes to building LLVM
------------------------

* The runtimes `libc`, `compiler-rt`, `openmp` and `libclc` now must be enabled
in `LLVM_ENABLE_RUNTIMES`, rather than `LLVM_ENABLE_PROJECTS`. Prior to LLVM 21,
they were allowed in `LLVM_ENABLE_PROJECTS`, but a warning was emitted. This
is now a fatal error.

Changes to TableGen
-------------------

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