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[libc][cmake] Make libc not included in LLVM_ENABLE_PROJECTS=all. #142626

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lntue merged 2 commits into from
Jun 4, 2025
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[libc][cmake] Make libc not included in LLVM_ENABLE_PROJECTS=all. #142626

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[libc][cmake] Make libc not included in LLVM_ENABLE_PROJECTS=all.
lntue Jun 3, 2025
62f40ea
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lntue Jun 4, 2025
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14 changes: 9 additions & 5 deletions llvm/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -108,15 +108,20 @@ endif()
# LLVM_EXTERNAL_${project}_SOURCE_DIR using LLVM_ALL_PROJECTS
# This allows an easy way of setting up a build directory for llvm and another
# one for llvm+clang+... using the same sources.
set(LLVM_ALL_PROJECTS "bolt;clang;clang-tools-extra;compiler-rt;cross-project-tests;libc;libclc;lld;lldb;mlir;openmp;polly;pstl")
# These projects will be included when "all" is included in LLVM_ENABLE_PROJECTS.
set(LLVM_ALL_PROJECTS "bolt;clang;clang-tools-extra;compiler-rt;cross-project-tests;libclc;lld;lldb;mlir;openmp;polly;pstl")
if (${CMAKE_SYSTEM_NAME} MATCHES "AIX")
# Disallow 'openmp' as a LLVM PROJECT on AIX as the supported way is to use
# LLVM_ENABLE_RUNTIMES.
list(REMOVE_ITEM LLVM_ALL_PROJECTS openmp)
endif()

# The flang project is not yet part of "all" projects (see C++ requirements)
set(LLVM_EXTRA_PROJECTS "flang")
# The "libc" project, which is not part of "all" projects, could be included in
# LLVM_ENABLE_PROJECTS. It is preferred to include "libc" in
# LLVM_ENABLE_RUNTIMES instead of LLVM_ENABLE_PROJECTS.
#
# The flang project is not yet part of "all" projects (see C++ requirements).
set(LLVM_EXTRA_PROJECTS "flang" "libc")
# List of all known projects in the mono repo
set(LLVM_KNOWN_PROJECTS "${LLVM_ALL_PROJECTS};${LLVM_EXTRA_PROJECTS}")
set(LLVM_ENABLE_PROJECTS "" CACHE STRING
Expand Down Expand Up @@ -167,8 +172,7 @@ if ("flang" IN_LIST LLVM_ENABLE_PROJECTS)
endif()

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