Issue with Quartus Prime PRO for Stratix 10 when using a string type in a VHDL project.

Hello,

When using "Quartus Prime Pro 20.1" software with "Stratix 10" chip, I have a problem with VHDL string type in my projects. At the same time, I don't have this problem when using "Quartus Prime Standard Edition 19.1" with "MAX 10" FPGA. For example, the problem occurs when I compile the following simple VHDL code:

LIBRARY ieee;

USE ieee.std_logic_1164.all;

ENTITY e1 IS

PORT

(

s_out: OUT string(1 to 2)

);

END e1;

ARCHITECTURE arch1 OF e1 IS

BEGIN

s_out <= "ab";

END arch1;

The compilation process stop suddenly and the error popup window appears with the message: "Sorry! The Quartus Prime software quit unexpectedly". Here is a preview of the report:

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Problem Details

Error:

Internal Error: Sub-system: QIS, File: /quartus/synth/qis/qis_name_processor.cpp, Line: 779

\s_out[1].'|' is not a valid node name

Stack Trace:

Quartus 0xa4d85: QIS_NAME_PROCESSOR_IMPL::create_names + 0x885 (synth_qis)

Quartus 0x3834b: QIS_RTL_STAGE::IMPL::create_instance_name_for_node + 0x8b (synth_qis)

Quartus 0x38b0d: QIS_RTL_STAGE::IMPL::create_names_for_all_nodes_post_extraction + 0x2dd (synth_qis)

Quartus 0x3e9ab: QIS_RTL_STAGE::IMPL::post_process_elaborated_entity + 0xc6b (synth_qis)

Quartus 0x3a631: QIS_RTL_STAGE::IMPL::elaborate + 0x16d1 (synth_qis)

Quartus 0x18e2e: qis_elaborate + 0x26e (synth_qis)

Quartus 0x16442: TclNRRunCallbacks + 0x62 (tcl86)

Quartus 0x17c4d: TclEvalEx + 0x9ed (tcl86)

Quartus 0xa6a8b: Tcl_FSEvalFileEx + 0x22b (tcl86)

Quartus 0xa5136: Tcl_EvalFile + 0x36 (tcl86)

Quartus 0x156f6: qexe_evaluate_tcl_script + 0x4e6 (comp_qexe)

Quartus 0x145e3: qexe_do_tcl + 0x4b3 (comp_qexe)

Quartus 0x1acae: qexe_run_tcl_option + 0x5ee (comp_qexe)

Quartus 0x18c31: QCU::DETAIL::intialise_qhd_and_run_qexe + 0xa1 (comp_qcu)

Quartus 0x2b0e2: qcu_run_tcl_option + 0x2f2 (comp_qcu)

Quartus 0x13cc: qsyn2_tcl_process_default_flow_option + 0x1dc (quartus_syn)

Quartus 0x1a5b0: qexe_run + 0x460 (comp_qexe)

Quartus 0x1b6ea: qexe_standard_main + 0x26a (comp_qexe)

Quartus 0x3039: qsyn2_main + 0x129 (quartus_syn)

Quartus 0x158d8: msg_main_thread + 0x18 (CCL_MSG)

Quartus 0x16f81: msg_thread_wrapper + 0x71 (CCL_MSG)

Quartus 0x21040: mem_thread_wrapper + 0x70 (ccl_mem)

Quartus 0x14e5d: msg_exe_main + 0x20d (CCL_MSG)

Quartus 0x4924: __scrt_common_main_seh + 0x11c (quartus_syn)

Quartus 0x17bd3: BaseThreadInitThunk + 0x13 (KERNEL32)

Quartus 0x6ce70: RtlUserThreadStart + 0x20 (ntdll)

End-trace

Executable: quartus_syn

Comment:

None

System Information

Platform: windows64

OS name: Windows 10

OS version: 10.0

Quartus Prime Information

Address bits: 64

Version: 20.1.0

Build: 177

Edition: Pro Edition

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How can I solve this problem?

Thank you in advance for any help.

(jd)