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-rw-r--r--cmake/Modules/MacroEnsureOutOfSourceBuild.cmake18
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diff --git a/cmake/Modules/MacroEnsureOutOfSourceBuild.cmake b/cmake/Modules/MacroEnsureOutOfSourceBuild.cmake
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+++ b/cmake/Modules/MacroEnsureOutOfSourceBuild.cmake
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+# 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 libcxxabi.
+ 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 )