Unresolved externals when linking with optimisation

[wu_internet]

I've got a Fortran Dll project which works OK compiled by IVF8.0 with optimisation disabled. However, when I tried to switch on optimisations, for example, use the switch O2 or O3, during linking process, it reported many unresolved externals, such as symbol _fltused, symbol alloca_probe ... , these symbols have not been used directly by my project, presumably they are some symbols related to the Fortran libraries. Anyone knows about these issues, please give me a hand.

Regards,

David

[TimP]

On the face of it, this problem seems more likely caused by mixing in objects built with mingw.

[wu_internet]

Could you please explain a little bit more about "mingw"?

Regards,

David

[TimP]

You have quoted error messages which look as if you had attempted to link in .obj files built by that version of gcc. There is no run-time library compatibility between Intel Windows compilers and the various Windows implementations of gcc.

[wu_internet]

Thanks for the help.

I might should have reported that the project was orginally converted from the compaq Fortran. After loads of frustration, I finally decided to start from scratch, althogh it cost me a lot of pain. Finally, I ended up without any problems when I was doing the optimisation. I stilldo not know what's causing the problem though. Anyway, the one-off pain has paid me back.

Regards,

David.