1 files changed, 47 insertions, 0 deletions
diff --git a/ml/dlib/dlib/test_for_odr_violations.cpp b/ml/dlib/dlib/test_for_odr_violations.cpp
new file mode 100644
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+++ b/ml/dlib/dlib/test_for_odr_violations.cpp
@@ -0,0 +1,47 @@
+// Copyright (C) 2014  Davis E. King (davis@dlib.net)
+// License: Boost Software License   See LICENSE.txt for the full license.
+#ifndef DLIB_TEST_FOR_ODR_VIOLATIONS_CPp_
+#define DLIB_TEST_FOR_ODR_VIOLATIONS_CPp_
+
+#include "test_for_odr_violations.h"
+
+extern "C"
+{
+// The point of this block of code is to cause a link time error that will prevent a user
+// from compiling part of their application with DLIB_ASSERT enabled and part with them
+// disabled since doing that would be a violation of C++'s one definition rule. 
+#ifdef ENABLE_ASSERTS
+    const int USER_ERROR__inconsistent_build_configuration__see_dlib_faq_1 = 0;
+#else
+    const int USER_ERROR__inconsistent_build_configuration__see_dlib_faq_1_ = 0;
+#endif
+
+
+// The point of this block of code is to cause a link time error if someone builds dlib via
+// cmake as a separately installable library, and therefore generates a dlib/config.h from
+// cmake, but then proceeds to use the default unconfigured dlib/config.h from version
+// control.  It should be obvious why this is bad, if it isn't you need to read a book
+// about C++.  Moreover, it can only happen if someone manually copies files around and
+// messes things up.  If instead they run `make install` or `cmake --build .  --target
+// install` things will be setup correctly, which is what they should do.  To summarize: DO
+// NOT BUILD A STANDALONE DLIB AND THEN GO CHERRY PICKING FILES FROM THE BUILD FOLDER AND
+// MIXING THEM WITH THE SOURCE FROM GITHUB.  USE CMAKE'S INSTALL SCRIPTS TO INSTALL DLIB.
+// Or even better, don't install dlib at all and instead build your program as shown in
+// examples/CMakeLists.txt
+#if defined(DLIB_NOT_CONFIGURED) && !defined(DLIB__CMAKE_GENERATED_A_CONFIG_H_FILE)
+    const int USER_ERROR__inconsistent_build_configuration__see_dlib_faq_2 = 0;
+#endif
+
+
+
+
+
+#ifdef DLIB_CHECK_FOR_VERSION_MISMATCH
+    const int DLIB_CHECK_FOR_VERSION_MISMATCH = 0;
+#endif
+
+}
+
+
+#endif // DLIB_TEST_FOR_ODR_VIOLATIONS_CPp_
+