How much RAM does your computer have?

I have 8 GB ram

OK, but running Windows so limited to 3GB per process. I would recommend Linux and clang You can also change to MSVC using OpenModelica, but it uses up more memory than GCC.

Hi,

The story is a bit more involved.
The MinGW GCC that comes with OpenModelica is a 32 bit executable and compiles to 32 bit executable.
So basically gcc can use only 2GB of memory when compiling.

I did change gcc.exe to be large address aware (but i don't remember if i did that too for cc1.exe)
which means it can go up to 4GB of memory.

You could try to compile with omc +target=msvc which uses cl (Visual Studio) compiler to compile the executable.

Also you could try to restart your computer and then try to compile immediately after that as you'll have more
contiguous memory available that way.

Cheers,
Adrian Pop/

Disabling some optimizations for gcc might also help, so instead of -O3 you could use -O0.
I think you can do that via MODELICAUSERCFLAGS env. variable, set it to -O0.

Cheers,
Adrian Pop/

Or using getCFlags() + setCompilerFlags(... + "-O0") API (don't ask me why they are different...)

Thanks for these ideas.

I didn't succeed with setting the parameter to -O0.

However I have problem to switch the compiler to msvc. I used in openmodelica shell setCompiler("msvc") but i have a message saying that MinGW32 doest not recognize msvc which mean that it is still GCC that compiles.

How I can do this switch?

Thanks

You need to use +target=msvc. It needs to create a different set of makefiles.
See also https://openmodelica.org/index.php/foru … =892#p3340