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-rw-r--r--libcxx/cmake/Modules/HandleOutOfTreeLLVM.cmake4
1 files changed, 4 insertions, 0 deletions
diff --git a/libcxx/cmake/Modules/HandleOutOfTreeLLVM.cmake b/libcxx/cmake/Modules/HandleOutOfTreeLLVM.cmake
index 599d8a1d4b2..c772143244a 100644
--- a/libcxx/cmake/Modules/HandleOutOfTreeLLVM.cmake
+++ b/libcxx/cmake/Modules/HandleOutOfTreeLLVM.cmake
@@ -41,6 +41,10 @@ macro(find_llvm_parts)
set(LLVM_CMAKE_PATH "${LLVM_BINARY_DIR}/lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm")
else()
set(LLVM_FOUND OFF)
+ message(WARNING "UNSUPPORTED LIBCXX CONFIGURATION DETECTED: "
+ "llvm-config not found and LLVM_PATH not defined.\n"
+ "Reconfigure with -DLLVM_CONFIG_PATH=path/to/llvm-config "
+ "or -DLLVM_PATH=path/to/llvm-source-root.")
return()
endif()
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