# 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 Compiler-RT.
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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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