"collect2.exe: error: Id returned 1 exit status" when building S-function

I am trying to build an S-function for use in a Simulink model on my Windows machine. But when I try to build it, I get an error that looks like this:

C:\Users\xxx\AppData\Local\Temp\mex_6822034771356968_15704\SourceCode.obj:SourceCode.c:(.text+0x316): undefined reference to `__imp_closesocket'

C:\Users\xxx\AppData\Local\Temp\mex_6822034771356968_15704\SourceCode.obj:SourceCode.c:(.text+0x323): undefined reference to `__imp_WSACleanup'

C:\Users\xxx\AppData\Local\Temp\mex_6822034771356968_15704\SourceCode.obj:SourceCode.c:(.text+0x401): undefined reference to `__imp_recv'

C:\Users\xxx\AppData\Local\Temp\mex_6822034771356968_15704\SourceCode.obj:SourceCode.c:(.text+0x5a3): undefined reference to `__imp_WSAStartup'

C:\Users\xxx\AppData\Local\Temp\mex_6822034771356968_15704\SourceCode.obj:SourceCode.c:(.text+0x5c1): undefined reference to `__imp_gethostbyname'

C:\Users\xxx\AppData\Local\Temp\mex_6822034771356968_15704\SourceCode.obj:SourceCode.c:(.text+0x5e7): undefined reference to `__imp_htons'

C:\Users\xxx\AppData\Local\Temp\mex_6822034771356968_15704\SourceCode.obj:SourceCode.c:(.text+0x615): undefined reference to `__imp_socket'

C:\Users\xxx\AppData\Local\Temp\mex_6822034771356968_15704\SourceCode.obj:SourceCode.c:(.text+0x61c): undefined reference to `__imp_connect'

C:\Users\xxx\AppData\Local\Temp\mex_6822034771356968_15704\SourceCode.obj:SourceCode.c:(.text+0x742): undefined reference to `__imp_WSAGetLastError'

C:\Users\xxx\AppData\Local\Temp\mex_6822034771356968_15704\SourceCode.obj:SourceCode.c:(.text+0xfdd): undefined reference to `__imp_recv'

C:\Users\xxx\AppData\Local\Temp\mex_6822034771356968_15704\SourceCode.obj:SourceCode.c:(.text+0x3987): undefined reference to `__imp_closesocket'

C:\Users\xxx\AppData\Local\Temp\mex_6822034771356968_15704\SourceCode.obj:SourceCode.c:(.text+0x398d): undefined reference to `__imp_WSACleanup'

collect2.exe: error: ld returned 1 exit status

It does not seem to matter whether I use the command line or the S-function builder. My colleagues seem able to build the function, so it does not appear to be a bug.

Answer 1

[MathWorks Support Team]

Usually, this indicates that the winsock library is missing.

Troubleshooting steps:

1. Are you able to build a simple MEX example such as "arrayProduct.c"?

https://www.mathworks.com/help/matlab/matlab_external/build-an-executable-mex-file.html

2. Confirm that only the ws_2_32.lib is on the path and mex is configured to use the MinGW64 compiler. Then, try running:

>> mex -lws2_32 SourceCode.c

3. Try reinstalling Windows SDK.

https://developer.microsoft.com/en-us/windows/downloads/windows-sdk/