Fix compilation for gcc 9.2.0 + different warnings #196
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…st in SDP Otherwise, we get obscure rapidjson error when reading an empty stream.
This caused compiler warning on gcc 9.2.0 (Caltech HPC): ../src/sdpb_util/json/Abstract_Json_Reader_Handler.hxx:54:27: warning: attribute ignored [-Wattributes]
…or on gcc 9.2.0 (Caltech HPC)
../src/sdp_solve/SDP/SDP/read_block_data/Json_Block_Data_Parser.hxx: In member function ‘virtual Block_Data_Parse_Result Json_Block_Data_Parser::get_result()’:
../src/sdp_solve/SDP/SDP/read_block_data/Json_Block_Data_Parser.hxx:24:74: error: use of deleted function ‘Block_Data_Parse_Result::Block_Data_Parse_Result(Block_Data_Parse_Result&&)’
24 | Block_Data_Parse_Result get_result() override { return std::move(result); }
| ^
In file included from ../src/sdp_solve/SDP/SDP/read_block_data/Json_Block_Data_Parser.hxx:3,
from ../src/sdp_solve/SDP/SDP/read_block_data/SDP_Block_Data.cxx:3:
../src/sdp_solve/SDP/SDP/read_block_data/Block_Data_Parse_Result.hxx:27:3: note: ‘Block_Data_Parse_Result::Block_Data_Parse_Result(Block_Data_Parse_Result&&) noexcept’ is implicitly deleted because its exception-specification does not match the implicit exception-specification ‘’
27 | Block_Data_Parse_Result(Block_Data_Parse_Result &&other) noexcept = default;
| ^~~~~~~~~~~~~~~~~~~~~~~ ^
…ttribute applied to <...> with void return type [-Wattributes]" ../src/pmp/Polynomial_Matrix_Program.hxx:33:17: warning: ‘nodiscard’ attribute applied to ‘Polynomial_Matrix_Program::Polynomial_Matrix_Program(std::vector<El::BigFloat, std::allocator<El::BigFloat> >, std::optional<std::vector<El::BigFloat, std::allocator<El::BigFloat> > >, size_t, std::vector<Polynomial_Vector_Matrix>, std::vector<long unsigned int>, std::vector<std::filesystem::__cxx11::path>)’ with void return type [-Wattributes]
…g: throw will always call terminate() [-Wterminate]
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