Disable the gfortran tree vectorizer for netlib LAPACK

Author: martin-frbg

cmake/lapack.cmake

@@ -999,6 +999,9 @@ endforeach ()
 
 if (NOT C_LAPACK)
   set_source_files_properties(${LA_SOURCES} PROPERTIES COMPILE_FLAGS "${LAPACK_FFLAGS}")
+  if (${F_COMPILER} STREQUAL "GFORTRAN")
+    set_source_files_properties(${LA_SOURCES} PROPERTIES COMPILE_FLAGS "${LAPACK_FFLAGS} -fno-tree-vectorize")
+  endif()
 else ()
   set_source_files_properties(${LA_SOURCES} PROPERTIES COMPILE_FLAGS "${LAPACK_CFLAGS}")
 endif ()