llvm-project

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# MACRO_ENSURE_OUT_OF_SOURCE_BUILD(<errorMessage>)
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macro( MACRO_ENSURE_OUT_OF_SOURCE_BUILD _errorMessage )
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string( COMPARE EQUAL "${CMAKE_SOURCE_DIR}" "${CMAKE_BINARY_DIR}" _insource )
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if( _insource )
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 message( SEND_ERROR "${_errorMessage}" )
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 message( FATAL_ERROR
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 "In-source builds are not allowed.
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 CMake would overwrite the makefiles distributed with libcxxabi.
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 Please create a directory and run cmake from there, passing the path
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 to this source directory as the last argument.
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 This process created the file `CMakeCache.txt' and the directory `CMakeFiles'.
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 Please delete them."
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 )
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endif( _insource )
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endmacro( MACRO_ENSURE_OUT_OF_SOURCE_BUILD )
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