Could not link 'vsim_auto_compile.dll' error troubleshooting.

Hi Njoroge,
 

Thank you for sharing the latest log.
 

Based on the log, the current issue appears to be that the GCC 6.3.0 compiler located at: C:\MinGW\bin\g++.exe  is unable to successfully link vsim_auto_compile.dll against the Questa 2024.1 libraries. From the transcript, it appears that Questa is picking up this external MinGW compiler from your system PATH rather than using its bundled GCC compiler.
 

To help further troubleshoot the issue, could you please provide the following information?

1. Which Quartus version are you currently using?
 

2. Could you check whether your Questa installation includes a bundled GCC compiler? If available, please try using the bundled GCC compiler instead.

Please look for a path similar to:

<Questa_install_dir>\gcc-<version>-mingw64<variant>\bin\g++.exe
For example: 

C:\questasim64_2024.1\gcc-10.3.0-mingw64vc16\bin\g++.exe or 

questa_fse\gcc-7.4.0-mingw64vc15\bin\g++.exe
If available, please let me know the exact path too. 

3. Once the bundled GCC compiler is located, could you try updating the vsim command to explicitly use it via the -dpicpppath option?
For example: eval vsim -voptargs=+acc -dpicpppath "<path_to_bundled_g++.exe>" $elabcommand
a { text-decoration: none; color: #464feb; } tr th, tr td { border: 1px solid #e6e6e6; } tr th { background-color: #f5f5f5; }

Note: If your DPI code does not use:

#include <winsock2.h>
then you may also try removing: -ldflags "-lws2_32" -64 and rerunning the simulation.

Regards, 
ZiYingE_Altera