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[libc] Fail fast when building standalone #119426

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Merged
merged 1 commit into from
Dec 12, 2024
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[libc] Fail fast when building standalone #119426

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6 changes: 6 additions & 0 deletions libc/CMakeLists.txt
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Original file line number Diff line number Diff line change
@@ -1,6 +1,12 @@
cmake_minimum_required(VERSION 3.20.0)
set(LLVM_SUBPROJECT_TITLE "libc")

if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
message(FATAL_ERROR "Builds rooted in the libc directory are not supported. "
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Seems nicer to me to error out, but I'm open to changing this to a warning instead.

"Builds should be rooted in the runtimes directory instead. "
"Please see the documentation at https://libc.llvm.org/usage_modes.html for more info.")
endif()

# Include LLVM's cmake policies.
if(NOT DEFINED LLVM_COMMON_CMAKE_UTILS)
set(LLVM_COMMON_CMAKE_UTILS ${CMAKE_CURRENT_SOURCE_DIR}/../cmake)
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