llvm-project/compiler-rt/cmake/Modules/MacroEnsureOutOfSourceBuild...

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CMake

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