make test-gpp, error: 'xxx' is not a member of 'std' - make test-gpp, error: 'xxx' is not a member of 'std' Description When using Intel® HLS 18.1 or later, you may encounter the following error during compiling HLS examples by "make test-gpp": "error:'xxx' is not a member of 'std' " Such error is due to C 11 / C 14 feature is used in HLS code but C 11 / C 14 option is not enabled in makefile Resolution Add c 14 support in make file, for example: test-gpp: CXX := g -std=c 11 test-gpp: CXX := g -std=c 14 Custom Fields values: ['novalue'] Troubleshooting 1507059315 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 19.1 18.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']