Peter, you might be interested in the fact that Jason Moxham has been
creating some batch files to automatically build MPIR in MSVC. That
should make it a whole lot easier to do. No need to muck around with
MSYS/MinGW at all.
For the moment you are having problems with combining MSYS and MSVC. I
had imagined that there was just one unresolved external symbol,
alloca. But it appears that *all* symbols are unresolved.
Looking at the MPIR manual (which I did not write), on page 13 in the
section MS Windows DLL's it tells you how to create an Microsoft .lib
import library.
It seems that MSVC needs this in order to know what symbols are
available in the MSYS built mpir.a which you created. Have you done
this step?
Sorry this is proving difficult, but you are literally the first
person who has ever tried to use an MSYS built MPIR library from MSVC,
that I know of. The standard way of using MPIR in Windows, and the way
which we know how to support, is to build MPIR using the provided
Visual Studio Solution files provided by Brian Gladman. But I admit
that is difficult to do if you've never done something like that
before. Shortly it will be as simple as running a batch script.
Since you are so close to getting it to work, I would try making the
.lib import library. I can't guarantee that is going to work first go
either. You may also need to change the calling conventions option in
MSVC (or maybe not, I don't know). Or you can wait a little longer
until we issue a new version of MPIR with the new batch scripts and
rewrite the documentation. Then things should be much simpler for new
users.
Another option you might eventually be interested in is Sage for
Windows. It uses MPIR, but gives you an easy to use Python language
and access to all sorts of maths libraries without you having to do
any work. If you only write C/C++ then that isn't really an option for
you at this stage.
Bill.
2009/6/19 Peter_APIIT <peterap...@gmail.com>:
>
> int main()
> {
> /* mpz_class first(123), second(123), result(0);
>
> result = first + second;
> result = result - second;
> result = first * second;
> result = first / second;
>
> cout << result.get_d();
> */
> mpz_t a, b, c;
>
> mpz_init(a);
> mpz_init(b);
> mpz_init(c);
>
> mpz_set_str(a, "123", 10);
> mpz_set_str(b, "1244", 10);
> mpz_set_str(c, "111231234578", 10);
>
> mpz_add(a, a, b);
> gmp_printf("Result is %Zd", a);
>
> mpz_clear(a);
> mpz_clear(b);
> mpz_clear(c);
>
>
> return 0;
> }
>
>
> error LNK2019: unresolved external symbol _isascii referenced in
> function ___gmp_doprnt libmpir.a
>
> error LNK2019: unresolved external symbol _snprintf referenced in
> function ___gmp_doprnt_mpf2 libmpir.a
>
> fatal error LNK1120: 2 unresolved externals D:\C++\MPIR\Exercise\Debug
> \Exercise.exe
>
>
> Actually, i use mpir library as big Num library and to generate prime
> number for RSA. What is your opinion ?
>
> This is too difficult to use.
>
> Please help.
>
> Thanks.
> >
>
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