Compiling error with Matlab 2019b - Error using mbuild (line 166)

Hello!

I’m having some issues when I try to compile a DLL in Matlab 2019b. I use the Library Compiler to create a DLL of a Matlab function, and then I create a wrapper and DLL using the mbuild command. I have recently been using Matlab 2014a, and I can use the following line without issue to create the DLL and wrappercode:

mbuild -v -g wtest.c test.lib LINKFLAGS="$LINKFLAGS /DLL " LDEXT=".dll" CMDLINE250="mt -outputresource:$EXE';'2 -manifest $MANIFEST";

However, if I use the same code in Matlab 2019b (I have compiled the Matlab function with the 2019b Library Compiler), I get the following error:

Error using mbuild (line 166)

Unable to complete successfully.

C:/MingGW/bin/../lib/gcc/x86_64-w64-mingw32/6.3.0/../../../../x86_64-w64-mingw32/lib/../lib/libmingw32.a(lib64_libmingw32_a-crt0_c.o):crt0_c.c:(.text.startup+0x2e):

undefined reference to `WinMain'

collect2.exe: error: ld returned 1 exit status

In Matlab 2014a the DLL is built using 'Microsoft Windows SDK 7.1', while the Matlab 2019b uses 'MinGW64 Compiler'.

I’ve had some troubles installing MinGW64 extension as I have Matlab on an offline computer, and I suspect this could be some of the issue. I've tried to reinstall it and still have the same issue.

Do you have any advice?

[Jack Frank]

I have the same issue, have you resolved this problem?

Frank

[Kristoffer Lied]

Hello! Sorry for the late reply.

No, I have not resolved the problem.

Kristoffer

Answer 1

[Sunil Patidar]

Hi,

Try using any of the supported Microsoft Visual C compiler mentioned in the list in the link below and see if you are able to generate the DLL wrapper

https://www.mathworks.com/content/dam/mathworks/mathworks-dot-com/support/sysreq/files/system-requirements-release-2019b-supported-compilers.pdf

Once you have installed the compiler you can use the "mbuild -setup" command to change the compiler that MATLAB will use.