Found the following significant warnings:
  /home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/sparsepp/include/sparsepp/spp.h:2111:23: warning: ‘void* memcpy(void*, const void*, size_t)’ writing to an object of type ‘spp::sparsetable<std::pair<const std::pair<unsigned int, unsigned int>, int>, spp::libc_allocator<std::pair<const std::pair<unsigned int, unsigned int>, int> > >::group_type’ {aka ‘class spp::sparsegroup<std::pair<const std::pair<unsigned int, unsigned int>, int>, spp::libc_allocator<std::pair<const std::pair<unsigned int, unsigned int>, int> > >’} with no trivial copy-assignment; use copy-initialization instead [-Wclass-memaccess]
  /home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/sparsepp/include/sparsepp/spp.h:2111:23: warning: ‘void* memcpy(void*, const void*, size_t)’ writing to an object of type ‘spp::sparsetable<std::pair<const std::pair<unsigned int, unsigned int>, float>, spp::libc_allocator<std::pair<const std::pair<unsigned int, unsigned int>, float> > >::group_type’ {aka ‘class spp::sparsegroup<std::pair<const std::pair<unsigned int, unsigned int>, float>, spp::libc_allocator<std::pair<const std::pair<unsigned int, unsigned int>, float> > >’} with no trivial copy-assignment; use copy-initialization instead [-Wclass-memaccess]
  /home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/sparsepp/include/sparsepp/spp.h:1389:19: warning: ‘void* memcpy(void*, const void*, size_t)’ writing to an object of type ‘spp::sparsegroup<std::pair<const std::pair<unsigned int, unsigned int>, int>, spp::libc_allocator<std::pair<const std::pair<unsigned int, unsigned int>, int> > >::value_type’ {aka ‘struct std::pair<const std::pair<unsigned int, unsigned int>, int>’} with no trivial copy-assignment; use copy-initialization instead [-Wclass-memaccess]
  /home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/sparsepp/include/sparsepp/spp.h:1389:19: warning: ‘void* memcpy(void*, const void*, size_t)’ writing to an object of type ‘spp::sparsegroup<std::pair<const std::pair<unsigned int, unsigned int>, float>, spp::libc_allocator<std::pair<const std::pair<unsigned int, unsigned int>, float> > >::value_type’ {aka ‘struct std::pair<const std::pair<unsigned int, unsigned int>, float>’} with no trivial copy-assignment; use copy-initialization instead [-Wclass-memaccess]
  /home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/sparsepp/include/sparsepp/spp_utils.h:422:44: warning: ‘void* realloc(void*, size_t)’ moving an object of non-trivially copyable type ‘struct std::pair<const std::pair<unsigned int, unsigned int>, int>’; use ‘new’ and ‘delete’ instead [-Wclass-memaccess]
  /home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/sparsepp/include/sparsepp/spp_utils.h:422:44: warning: ‘void* realloc(void*, size_t)’ moving an object of non-trivially copyable type ‘struct std::pair<const std::pair<unsigned int, unsigned int>, float>’; use ‘new’ and ‘delete’ instead [-Wclass-memaccess]
  /home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/sparsepp/include/sparsepp/spp.h:2111:23: warning: ‘void* memcpy(void*, const void*, size_t)’ writing to an object of type ‘spp::sparsetable<std::pair<const std::__cxx11::basic_string<char>, unsigned int>, spp::libc_allocator<std::pair<const std::__cxx11::basic_string<char>, unsigned int> > >::group_type’ {aka ‘class spp::sparsegroup<std::pair<const std::__cxx11::basic_string<char>, unsigned int>, spp::libc_allocator<std::pair<const std::__cxx11::basic_string<char>, unsigned int> > >’} with no trivial copy-assignment; use copy-initialization instead [-Wclass-memaccess]
See ‘/home/hornik/tmp/R.check/r-patched-gcc/Work/PKGS/text2vec.Rcheck/00install.out’ for details.