fix #4136

cmake/ShogunFindLAPACK.cmake

@@ -22,6 +22,12 @@ IF (LAPACK_FOUND)
         MESSAGE(STATUS "Enabling Accelerate.framework as LAPACK backend for Eigen.")
         SET(EIGEN_USE_LAPACKE_STRICT 1)
         LIST(APPEND LAPACK_LIBRARIES ${LAPACKE_LIBRARY})
+        find_library(VECLIB vecLib)
+        if (VECLIB)
+          LIST(APPEND LAPACK_LIBRARIES ${VECLIB})
+        else()
+          MESSAGE(FATAL_ERROR "Accelerate.framework without vecLib.framework!")
+        endif()
       endif()
     endif()
   ELSEIF("${LAPACK_LIBRARIES}" MATCHES ".*/.*mkl_.*")
@@ -92,7 +98,7 @@ IF (LAPACK_FOUND)
     ENDIF()
 
     IF(FOUND_CBLAS_DGEMV AND NOT HAVE_ATLAS)
-      #check is detected BLAS/LAPACK is OpenBLAS by looking for an OpenBLAS specific function 
+      #check is detected BLAS/LAPACK is OpenBLAS by looking for an OpenBLAS specific function
       check_library_exists("${LAPACK_LIBRARIES}" openblas_set_num_threads "" OpenBLAS_FOUND)
       IF(OpenBLAS_FOUND)
         #check if cblas.h exists

src/shogun/mathematics/lapack.h

@@ -1,7 +1,7 @@
 /*
  * This software is distributed under BSD 3-clause license (see LICENSE file).
  *
- * Authors: Sergey Lisitsyn, Viktor Gal, Soeren Sonnenburg, Soumyajit De, 
+ * Authors: Sergey Lisitsyn, Viktor Gal, Soeren Sonnenburg, Soumyajit De,
  *          Evan Shelhamer, Björn Esser
  */
 
@@ -19,13 +19,7 @@ extern "C" {
 #include <mkl_cblas.h>
 #include <mkl_lapack.h>
 #elif defined(HAVE_MVEC)
-//FIXME: Accelerate framework's vForce.h forward declares
-// std::complex<> classes that causes major errors
-// in c++11 mode and Eigen3
-// this define basically disables the include of vForce.h
-#ifdef HAVE_CXX11
 #define __VFORCE_H 1
-#endif
 #if !(defined(EIGEN_USE_LAPACKE) || defined(EIGEN_USE_LAPACKE_STRICT))
 #include <Accelerate/Accelerate.h>
 #else