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cmake/MacroEnsureOutOfSourceBuild.cmake

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+# - MACRO_ENSURE_OUT_OF_SOURCE_BUILD(<errorMessage>)
+# MACRO_ENSURE_OUT_OF_SOURCE_BUILD(<errorMessage>)
+#    Call this macro in your project if you want to enforce out-of-source builds.
+#    If an in-source build is detected, it will abort with the given error message.
+#    This macro works in any of the CMakeLists.txt of your project, but the recommended
+#    location to call this is close to the beginning of the top level CMakeLists.txt
+
+# Copyright (c) 2006, Alexander Neundorf, <neundorf@kde.org>
+#
+# Redistribution and use is allowed according to the terms of the BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+
+MACRO (MACRO_ENSURE_OUT_OF_SOURCE_BUILD _errorMessage)
+
+   STRING(COMPARE EQUAL "${CMAKE_SOURCE_DIR}" "${CMAKE_BINARY_DIR}" insource)
+   IF(insource)
+      MESSAGE(FATAL_ERROR "${_errorMessage}")
+   ENDIF(insource)
+
+ENDMACRO (MACRO_ENSURE_OUT_OF_SOURCE_BUILD)
+