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From: David Brown <david.brown@hesbynett.no>
Newsgroups: comp.lang.c
Subject: Re: Python recompile
Date: Tue, 11 Mar 2025 21:20:38 +0100
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On 11/03/2025 18:47, bart wrote:
> On 11/03/2025 17:09, David Brown wrote:
>> On 11/03/2025 17:23, bart wrote:
>>> On 11/03/2025 15:06, David Brown wrote:
>>>> On 11/03/2025 15:24, bart wrote:
>>>>>
>>>>> To build open source projects, I'm happy to use an existing C 
>>>>> compiler. I'm NOT happy about bending over backwards to use CYGWIN, 
>>>>> MSYS2 or WSL because the developers insist on forcing their Linux 
>>>>> dependencies down my throat.
>>>>>
>>>>>
>>>>> Developers can do what they like. But they shouldn't inflict their 
>>>>> choices on other people, especially those using other OSes.
>>>>>
>>>>
>>>> I have not paid a lot of attention to this thread.  But I am curious 
>>>> here - who do you think is /forcing/ you to compile their code?
>>>
>>> OK, tell me where to get ready-made DLLs for GMP and LIBFFI that I 
>>> can can use on Windows. If that's not possible then there is no 
>>> choice (other than not to use them at all, which is what I do).
>>>
>>
>> So do you think that those projects are /forcing/ you to use their 
>> code?   Are the folks who wrote GMP responsible for /your/ insistence 
>> on using /their/ code, without using additional tools or libraries?  
>> You want to use what probably amounts to hundreds of person-years of 
>> specialised work, for free, and you are not willing to go to the 
>> effort of downloading and installing a few other bits of /free/ 
>> software first, in order to be able to follow freely available 
>> instructions found online?
>>
>> And you blame the GMP and LIBFFI for all this?  They are, after all, 
>> holding a gun to your head and insisting that you use their software 
>> while viscously and maliciously refusing to re-write their code to 
>> remove traces of code that rely on the platforms they use themselves.
>>
>> Or maybe it is now /my/ responsibility to find these dll's for you?
>>
>> Well, you are in luck :
>>
>> <https://packages.msys2.org/packages/mingw-w64-ucrt-x86_64-gmp>
>> <https://packages.msys2.org/packages/mingw-w64-ucrt-x86_64-libffi>
>>
>> The compressed tarballs include the dlls.
> 
> I downloaded a couple of large files, including 
> mingw64-x86_64-gmp-6.3.0-1-src.tar, but found no trace of any DLL files.

You downloaded the source tarballs, and are surprised to find they 
contain source files - not binaries?  Did the abbreviation "src" not 
give you a clue?

Try the link that is labelled "File:" - it is the msys2/mingw-w64 
tarball with libgmp-10.dll and all the other files shown in the list at 
the bottom of the page, under "Files:".

Now, it may be that those dll's rely on other dll's that are a standard 
part of the msys2 packaging - that's up to you to figure out, since you 
don't want to use a convenient setup.

The page also has a link to a page on a site called 
"release-monitoring.org", which again has a link to a page on 
"cran.r-project.org" :

<https://cran.r-project.org/web/packages/gmp/index.html>

This also has Windows binaries for gmp.  I leave it up to you to figure 
out which file you should be downloading, and to check if the dll is 
directly suitable for you.


> 
> (But I'm pleased that the GMP configure script hasn't grown beyond 30583 
> lines. When they manage 0 lines, let me know.)
> 
> Meanwhile here is the library *I* had to use instead:
> 
>    https://github.com/sal55/langs/tree/master/bignum
> 

It is not exactly comparable, is it?

If all you need is some simple arithmetic done in a naïve school long 
multiplication way, then the code is fine.  Your code is a reasonably 
clear and straightforward implementation of that.  If you have no need 
of more than that, there is little point in going for something as 
powerful as GMP - it is probably faster to write such code than it is to 
learn how to use GMP.