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[cmake] Introduce LLVM_DISABLE_PROJECTS to easily exclude projects #141535

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[cmake] Introduce LLVM_DISABLE_PROJECTS to easily exclude projects #141535

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6 changes: 5 additions & 1 deletion llvm/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -138,6 +138,10 @@ if(NOT "${FOUND_INDEX}" STREQUAL "-1")
list(REMOVE_ITEM LLVM_ENABLE_PROJECTS "pstl")
endif()

foreach(proj ${LLVM_DISABLE_PROJECTS})
list(REMOVE_ITEM LLVM_ENABLE_PROJECTS "${proj}")
endforeach ()

foreach(proj ${LLVM_ENABLE_PROJECTS})
if (NOT proj STREQUAL "llvm" AND NOT "${proj}" IN_LIST LLVM_KNOWN_PROJECTS)
MESSAGE(FATAL_ERROR "${proj} isn't a known project: ${LLVM_KNOWN_PROJECTS}. Did you mean to enable it as a runtime in LLVM_ENABLE_RUNTIMES?")
Expand Down Expand Up @@ -666,7 +670,7 @@ if(LLVM_EXPERIMENTAL_TARGETS_TO_BUILD STREQUAL "all")
set(LLVM_EXPERIMENTAL_TARGETS_TO_BUILD ${LLVM_ALL_EXPERIMENTAL_TARGETS})
endif()

if("flang" IN_LIST LLVM_ENABLE_PROJECTS AND
if("flang" IN_LIST LLVM_ENABLE_PROJECTS AND
"AArch64" IN_LIST LLVM_TARGETS_TO_BUILD AND
NOT ("compiler-rt" IN_LIST LLVM_ENABLE_RUNTIMES OR "compiler-rt" IN_LIST LLVM_ENABLE_PROJECTS))
message(STATUS "Enabling compiler-rt as a dependency of Flang")
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8 changes: 8 additions & 0 deletions llvm/docs/CMake.rst
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Expand Up @@ -435,6 +435,14 @@ its enabled sub-projects. Nearly all of these variable names begin with
of the machine where LLVM is being built. If you are building a cross-compiler,
set it to the target triple of your desired architecture.

**LLVM_DISABLE_PROJECTS**:STRING
Semicolon-separated list of projects to exclude from the build. Sometimes it is
more convenient to exclude a few projects than to have to enumerate all other
projects. This flag can be combined with ``LLVM_ENABLE_PROJECTS`` to easily
select projects of interest in the build. For example, the command:
``cmake ... -DLLVM_ENABLE_PROJECTS=all -DLLVM_DISABLE_PROJECTS=libclc ...``
allows to build all projects but ``libclc``.

**LLVM_DOXYGEN_QCH_FILENAME**:STRING
The filename of the Qt Compressed Help file that will be generated when
``-DLLVM_ENABLE_DOXYGEN=ON`` and
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