long double: from mac to windows..

[Sandro Gallo]

Hi all,
I hope I can do a question about C programming in this forum; otherwise I apologize.

I implemented a C program using my mac book.
Now, my client wants to migrate to windows OS (MinGW).

Program does many calculation using long double: on mac it works fine, otherwise on winz doesn't.

I read on internet the problem is that long double type is supposed to be a double type in WinZ, because it is no supported.

Making sizeof of double and long double, I obtain:
MAC
DOUBLE=8, LONG DOUBLE=16
WINZ
DOUBLE=8, LONG DOUBLE=12

Is there a solution or a workaround?
How can I "force" the use of long double or its simulation?

Sorry for my English.
Thanks in advance

[modoran]

Maybe you should look at an arbitrary precision library, like GMP. It is cross-platform and compiles under windows using MSYS and MinGW as well.

[Sandro Gallo]

Thank you for your answer.
I investigate about GMP.
How can I use that library?

[modoran]

You can find all documentation and example code on library website:
http://gmplib.org/

[Sandro Gallo]

thanks