The callback function specified in the UIR file, is not a known function

Hello,

I'm compiling a Code::Bloks project with C and FORTRAN source files using "x86_64-w64-mingw32-gcc-8.1.0.exe" as a compiler on a Windows 64bit system.

The project includes a UIR generated with CVI2019 and for this reason I used the external compiler support for generate the table of callback functions C file that I included in the project.

Compilation and linking seems going well and an exacutable file is produced. 

However, when I run it, I get the following error in call to LoadPanel function:

Error code -86, The callback function, XYZ, specified in the UIR file, is not a known function.

Obviously the callback XYZ is defined in the project.

I tried to and the linker option -rdynamic, but this is not supported by the compiler "x86_64-w64-mingw32-gcc-8.1.0.exe".

Could someone be of some help?

Thank yuo very much.

Lorenzo