Issue an error in case of direct inclusion of internal headers.

unsupported/Eigen/src/AutoDiff/AutoDiffJacobian.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_AUTODIFF_JACOBIAN_H
 #define EIGEN_AUTODIFF_JACOBIAN_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen
 {
 

unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_AUTODIFF_SCALAR_H
 #define EIGEN_AUTODIFF_SCALAR_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 namespace internal {

unsupported/Eigen/src/AutoDiff/AutoDiffVector.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_AUTODIFF_VECTOR_H
 #define EIGEN_AUTODIFF_VECTOR_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 /* \class AutoDiffScalar

unsupported/Eigen/src/AutoDiff/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_AUTODIFF_MODULE_H
+#error "Please include unsupported/Eigen/AutoDiff instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/BVH/BVAlgorithms.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_BVALGORITHMS_H
 #define EIGEN_BVALGORITHMS_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/BVH/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_BVH_MODULE_H
+#error "Please include unsupported/Eigen/BVH instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/BVH/KdBVH.h

@@ -10,6 +10,8 @@
 #ifndef KDBVH_H_INCLUDED
 #define KDBVH_H_INCLUDED
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/Eigenvalues/ArpackSelfAdjointEigenSolver.h

@@ -12,6 +12,8 @@
 
 #include "../../../../Eigen/Dense"
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/Eigenvalues/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_EIGENVALUES_MODULE_H
+#error "Please include unsupported/Eigen/Eigenvalues instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/EulerAngles/EulerAngles.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_EULERANGLESCLASS_H// TODO: Fix previous "EIGEN_EULERANGLES_H" definition?
 #define EIGEN_EULERANGLESCLASS_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen
 {
   /** \class EulerAngles

unsupported/Eigen/src/EulerAngles/EulerSystem.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_EULERSYSTEM_H
 #define EIGEN_EULERSYSTEM_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen
 {
   // Forward declarations

unsupported/Eigen/src/EulerAngles/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_EULERANGLES_MODULE_H
+#error "Please include unsupported/Eigen/EulerAngles instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/FFT/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_FFT_MODULE_H
+#error "Please include unsupported/Eigen/FFT instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/FFT/ei_fftw_impl.h

@@ -7,6 +7,8 @@
 // Public License v. 2.0. If a copy of the MPL was not distributed
 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/FFT/ei_kissfft_impl.h

@@ -7,6 +7,8 @@
 // Public License v. 2.0. If a copy of the MPL was not distributed
 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/IterativeSolvers/ConstrainedConjGrad.h

@@ -33,6 +33,8 @@
 
 #include "../../../../Eigen/Core"
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/IterativeSolvers/DGMRES.h

@@ -12,6 +12,8 @@
 
 #include "../../../../Eigen/Eigenvalues"
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
   
 template< typename MatrixType_,

unsupported/Eigen/src/IterativeSolvers/GMRES.h

@@ -11,6 +11,8 @@
 #ifndef EIGEN_GMRES_H
 #define EIGEN_GMRES_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 namespace internal {

unsupported/Eigen/src/IterativeSolvers/IDRS.h

@@ -13,6 +13,8 @@
 #ifndef EIGEN_IDRS_H
 #define EIGEN_IDRS_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen
 {
 

unsupported/Eigen/src/IterativeSolvers/IncompleteLU.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_INCOMPLETE_LU_H
 #define EIGEN_INCOMPLETE_LU_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 template <typename Scalar_>

unsupported/Eigen/src/IterativeSolvers/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_ITERATIVE_SOLVERS_MODULE_H
+#error "Please include unsupported/Eigen/IterativeSolvers instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/IterativeSolvers/IterationController.h

@@ -58,6 +58,8 @@
 #ifndef EIGEN_ITERATION_CONTROLLER_H
 #define EIGEN_ITERATION_CONTROLLER_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 /** \ingroup IterativeLinearSolvers_Module

unsupported/Eigen/src/IterativeSolvers/MINRES.h

@@ -14,6 +14,8 @@
 #define EIGEN_MINRES_H_
 
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
     
     namespace internal {

unsupported/Eigen/src/IterativeSolvers/Scaling.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_ITERSCALING_H
 #define EIGEN_ITERSCALING_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 /**

unsupported/Eigen/src/KroneckerProduct/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_KRONECKER_PRODUCT_MODULE_H
+#error "Please include unsupported/Eigen/KroneckerProduct instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/KroneckerProduct/KroneckerTensorProduct.h

@@ -12,6 +12,8 @@
 #ifndef KRONECKER_TENSOR_PRODUCT_H
 #define KRONECKER_TENSOR_PRODUCT_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 /*!

unsupported/Eigen/src/LevenbergMarquardt/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_LEVENBERGMARQUARDT_MODULE_H
+#error "Please include unsupported/Eigen/LevenbergMarquardt instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/LevenbergMarquardt/LMcovar.h

@@ -12,6 +12,8 @@
 #ifndef EIGEN_LMCOVAR_H
 #define EIGEN_LMCOVAR_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/LevenbergMarquardt/LMonestep.h

@@ -14,6 +14,8 @@
 #ifndef EIGEN_LMONESTEP_H
 #define EIGEN_LMONESTEP_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 template<typename FunctorType>

unsupported/Eigen/src/LevenbergMarquardt/LMpar.h

@@ -12,6 +12,8 @@
 #ifndef EIGEN_LMPAR_H
 #define EIGEN_LMPAR_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 namespace internal {

unsupported/Eigen/src/LevenbergMarquardt/LMqrsolv.h

@@ -15,6 +15,8 @@
 #ifndef EIGEN_LMQRSOLV_H
 #define EIGEN_LMQRSOLV_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/LevenbergMarquardt/LevenbergMarquardt.h

@@ -20,6 +20,8 @@
 #define EIGEN_LEVENBERGMARQUARDT_H
 
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 namespace LevenbergMarquardtSpace {
     enum Status {

unsupported/Eigen/src/MatrixFunctions/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_MATRIX_FUNCTIONS_MODULE_H
+#error "Please include unsupported/Eigen/MatrixFunctions instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h

@@ -13,6 +13,8 @@
 
 #include "StemFunction.h"
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 namespace internal {
 

unsupported/Eigen/src/MatrixFunctions/MatrixFunction.h

@@ -13,6 +13,8 @@
 #include "StemFunction.h"
 
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/MatrixFunctions/MatrixLogarithm.h

@@ -11,6 +11,8 @@
 #ifndef EIGEN_MATRIX_LOGARITHM
 #define EIGEN_MATRIX_LOGARITHM
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal { 

unsupported/Eigen/src/MatrixFunctions/MatrixPower.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_MATRIX_POWER
 #define EIGEN_MATRIX_POWER
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 template<typename MatrixType> class MatrixPower;

unsupported/Eigen/src/MatrixFunctions/MatrixSquareRoot.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_MATRIX_SQUARE_ROOT
 #define EIGEN_MATRIX_SQUARE_ROOT
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/MatrixFunctions/StemFunction.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_STEM_FUNCTION
 #define EIGEN_STEM_FUNCTION
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/MoreVectorization/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_MOREVECTORIZATION_MODULE_H
+#error "Please include unsupported/Eigen/MoreVectorization instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/MoreVectorization/MathFunctions.h

@@ -11,6 +11,8 @@
 #ifndef EIGEN_MOREVECTORIZATION_MATHFUNCTIONS_H
 #define EIGEN_MOREVECTORIZATION_MATHFUNCTIONS_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/NonLinearOptimization/HybridNonLinearSolver.h

@@ -13,6 +13,8 @@
 #ifndef EIGEN_HYBRIDNONLINEARSOLVER_H
 #define EIGEN_HYBRIDNONLINEARSOLVER_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace HybridNonLinearSolverSpace { 

unsupported/Eigen/src/NonLinearOptimization/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_NONLINEAROPTIMIZATION_MODULE_H
+#error "Please include unsupported/Eigen/NonLinearOptimization instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/NonLinearOptimization/LevenbergMarquardt.h

@@ -13,6 +13,8 @@
 #ifndef EIGEN_LEVENBERGMARQUARDT__H
 #define EIGEN_LEVENBERGMARQUARDT__H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace LevenbergMarquardtSpace {

unsupported/Eigen/src/NonLinearOptimization/chkder.h

@@ -1,6 +1,8 @@
 #define chkder_log10e 0.43429448190325182765
 #define chkder_factor 100.
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/NonLinearOptimization/covar.h

@@ -1,3 +1,5 @@
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/NonLinearOptimization/dogleg.h

@@ -1,3 +1,5 @@
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/NonLinearOptimization/fdjac1.h

@@ -1,3 +1,5 @@
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/NonLinearOptimization/lmpar.h

@@ -1,3 +1,5 @@
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/NonLinearOptimization/qrsolv.h

@@ -1,3 +1,5 @@
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/NonLinearOptimization/r1mpyq.h

@@ -1,3 +1,5 @@
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/NonLinearOptimization/r1updt.h

@@ -1,3 +1,5 @@
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/NonLinearOptimization/rwupdt.h

@@ -1,3 +1,5 @@
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/NumericalDiff/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_NUMERICALDIFF_MODULE_H
+#error "Please include unsupported/Eigen/NumericalDiff instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/NumericalDiff/NumericalDiff.h

@@ -13,6 +13,8 @@
 #ifndef EIGEN_NUMERICAL_DIFF_H
 #define EIGEN_NUMERICAL_DIFF_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 enum NumericalDiffMode {

unsupported/Eigen/src/Polynomials/Companion.h

@@ -14,6 +14,8 @@
 // * Eigen/Core
 // * Eigen/src/PolynomialSolver.h
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal {

unsupported/Eigen/src/Polynomials/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_POLYNOMIALS_MODULE_H
+#error "Please include unsupported/Eigen/Polynomials instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/Polynomials/PolynomialSolver.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_POLYNOMIAL_SOLVER_H
 #define EIGEN_POLYNOMIAL_SOLVER_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 /** \ingroup Polynomials_Module

unsupported/Eigen/src/Polynomials/PolynomialUtils.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_POLYNOMIAL_UTILS_H
 #define EIGEN_POLYNOMIAL_UTILS_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 /** \ingroup Polynomials_Module

unsupported/Eigen/src/Skyline/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_SKYLINE_MODULE_H
+#error "Please include unsupported/Eigen/Skyline instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/Skyline/SkylineInplaceLU.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_SKYLINEINPLACELU_H
 #define EIGEN_SKYLINEINPLACELU_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 /** \ingroup Skyline_Module

unsupported/Eigen/src/Skyline/SkylineMatrix.h

@@ -13,6 +13,8 @@
 #include "SkylineStorage.h"
 #include "SkylineMatrixBase.h"
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 /** \ingroup Skyline_Module

unsupported/Eigen/src/Skyline/SkylineMatrixBase.h

@@ -12,6 +12,8 @@
 
 #include "SkylineUtil.h"
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 /** \ingroup Skyline_Module

unsupported/Eigen/src/Skyline/SkylineProduct.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_SKYLINEPRODUCT_H
 #define EIGEN_SKYLINEPRODUCT_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 template<typename Lhs, typename Rhs, int ProductMode>

unsupported/Eigen/src/Skyline/SkylineStorage.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_SKYLINE_STORAGE_H
 #define EIGEN_SKYLINE_STORAGE_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 /** Stores a skyline set of values in three structures :

unsupported/Eigen/src/Skyline/SkylineUtil.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_SKYLINEUTIL_H
 #define EIGEN_SKYLINEUTIL_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 #ifdef NDEBUG

unsupported/Eigen/src/SparseExtra/BlockSparseMatrix.h

@@ -11,6 +11,8 @@
 #ifndef EIGEN_SPARSEBLOCKMATRIX_H
 #define EIGEN_SPARSEBLOCKMATRIX_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 /** \ingroup SparseCore_Module
   *

unsupported/Eigen/src/SparseExtra/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_SPARSE_EXTRA_MODULE_H
+#error "Please include unsupported/Eigen/SparseExtra instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/SparseExtra/MarketIO.h

@@ -14,6 +14,8 @@
 #include <iostream>
 #include <vector>
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen { 
 
 namespace internal 

unsupported/Eigen/src/SparseExtra/MatrixMarketIterator.h

@@ -11,6 +11,8 @@
 #ifndef EIGEN_BROWSE_MATRICES_H
 #define EIGEN_BROWSE_MATRICES_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 enum {

unsupported/Eigen/src/SparseExtra/RandomSetter.h

@@ -16,6 +16,8 @@
 namespace google {}
 #endif
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 /** Represents a std::map

unsupported/Eigen/src/SpecialFunctions/BesselFunctionsArrayAPI.h

@@ -11,6 +11,8 @@
 #ifndef EIGEN_BESSELFUNCTIONS_ARRAYAPI_H
 #define EIGEN_BESSELFUNCTIONS_ARRAYAPI_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 /** \returns an expression of the coefficient-wise i0(\a x) to the given

unsupported/Eigen/src/SpecialFunctions/BesselFunctionsBFloat16.h

@@ -8,6 +8,8 @@
 #ifndef EIGEN_BESSELFUNCTIONS_BFLOAT16_H
 #define EIGEN_BESSELFUNCTIONS_BFLOAT16_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 namespace numext {
 

unsupported/Eigen/src/SpecialFunctions/BesselFunctionsFunctors.h

@@ -11,6 +11,8 @@
 #ifndef EIGEN_BESSELFUNCTIONS_FUNCTORS_H
 #define EIGEN_BESSELFUNCTIONS_FUNCTORS_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 namespace internal {

unsupported/Eigen/src/SpecialFunctions/BesselFunctionsHalf.h

@@ -8,6 +8,8 @@
 #ifndef EIGEN_BESSELFUNCTIONS_HALF_H
 #define EIGEN_BESSELFUNCTIONS_HALF_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 namespace numext {
 

unsupported/Eigen/src/SpecialFunctions/BesselFunctionsImpl.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_BESSEL_FUNCTIONS_H
 #define EIGEN_BESSEL_FUNCTIONS_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 namespace internal {
 

unsupported/Eigen/src/SpecialFunctions/BesselFunctionsPacketMath.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_BESSELFUNCTIONS_PACKETMATH_H
 #define EIGEN_BESSELFUNCTIONS_PACKETMATH_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 namespace internal {

unsupported/Eigen/src/SpecialFunctions/HipVectorCompatibility.h

@@ -5,6 +5,8 @@ namespace hip_impl {
   template <typename, typename, unsigned int> struct Scalar_accessor;
 }   // end namespace hip_impl
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 namespace internal {
 

unsupported/Eigen/src/SpecialFunctions/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_SPECIALFUNCTIONS_MODULE_H
+#error "Please include unsupported/Eigen/SpecialFunctions instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsArrayAPI.h

@@ -11,6 +11,8 @@
 #ifndef EIGEN_SPECIALFUNCTIONS_ARRAYAPI_H
 #define EIGEN_SPECIALFUNCTIONS_ARRAYAPI_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 /** \cpp11 \returns an expression of the coefficient-wise igamma(\a a, \a x) to the given arrays.

unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsBFloat16.h

@@ -8,6 +8,8 @@
 #ifndef EIGEN_SPECIALFUNCTIONS_BFLOAT16_H
 #define EIGEN_SPECIALFUNCTIONS_BFLOAT16_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 namespace numext {
 

unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsFunctors.h

@@ -11,6 +11,8 @@
 #ifndef EIGEN_SPECIALFUNCTIONS_FUNCTORS_H
 #define EIGEN_SPECIALFUNCTIONS_FUNCTORS_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 namespace internal {

unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsHalf.h

@@ -8,6 +8,8 @@
 #ifndef EIGEN_SPECIALFUNCTIONS_HALF_H
 #define EIGEN_SPECIALFUNCTIONS_HALF_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 namespace numext {
 

unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsImpl.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_SPECIAL_FUNCTIONS_H
 #define EIGEN_SPECIAL_FUNCTIONS_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 namespace internal {
 

unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsPacketMath.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_SPECIALFUNCTIONS_PACKETMATH_H
 #define EIGEN_SPECIALFUNCTIONS_PACKETMATH_H
 
+#include "./InternalHeaderCheck.h"
+
 namespace Eigen {
 
 namespace internal {

unsupported/Eigen/src/Splines/InternalHeaderCheck.h

@@ -0,0 +1,3 @@
+#ifndef EIGEN_SPLINES_MODULE_H
+#error "Please include unsupported/Eigen/Splines instead of including headers inside the src directory directly."
+#endif

unsupported/Eigen/src/Splines/Spline.h

@@ -10,6 +10,8 @@
 #ifndef EIGEN_SPLINE_H
 #define EIGEN_SPLINE_H
 
+#include "./InternalHeaderCheck.h"
+
 #include "SplineFwd.h"
 
 namespace Eigen

unsupported/Eigen/src/Splines/SplineFitting.h

@@ -15,11 +15,14 @@
 #include <numeric>
 #include <vector>
 
+#include "./InternalHeaderCheck.h"
+
 #include "SplineFwd.h"
 
 #include "../../../../Eigen/LU"
 #include "../../../../Eigen/QR"
 
+
 namespace Eigen
 {
   /**

unsupported/Eigen/src/Splines/SplineFwd.h

@@ -10,6 +10,7 @@
 #ifndef EIGEN_SPLINES_FWD_H
 #define EIGEN_SPLINES_FWD_H
 
+#include "./InternalHeaderCheck.h"
 #include "../../../../Eigen/Core"
 
 namespace Eigen