Bug#804768: eigen3: cause opencv ftbfs when LDBL_MANT_DIG greater than 112

[Jurica Stanojkovic]

Hello,

I have attached patch for package eigen3_3.3~alpha1-2 which is resolving 
reported issue.

Resulting deb package, that we get by building package eigen3 with this patch, 
is later used to build package opencv on mips64el and with it package opencv 
was built successfully on mips64el.

Please include this patch.

Thank you!

Regards,
Jurica


--- eigen3-3.3~alpha1.orig/unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h
+++ eigen3-3.3~alpha1/unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h
@@ -348,7 +348,7 @@ void matrix_exp_compute(const MatrixType
   typedef typename NumTraits<Scalar>::Real RealScalar;
   typedef typename std::complex<RealScalar> ComplexScalar;
   if (sizeof(RealScalar) > 14) {
-    result = arg.matrixFunction(StdStemFunctions<ComplexScalar>::exp);
+    result = arg.matrixFunction(internal::stem_function_exp<ComplexScalar>);
     return;
   }
 #endif