assertion failure in snprntffuns.c:79 for i686-w64-mingw32

[Vincent Lefevre]

On 2020-01-11 16:33:30 +0100, Marco Bodrato wrote:
> Ciao,
> 
> Il Ven, 10 Gennaio 2020 5:04 pm, Vincent Lefevre ha scritto:
> > On 2020-01-10 16:27:31 +0100, Marco Bodrato wrote:
> >> Can you please try with the development version?
> 
> > I get the following error:
> 
> > gmp_vsnprintf return value wrong
> 
> ... because there was an error in the process of cross-compilation...
> 
> > Is there a way to tell GMP's configure that vsnprintf is missing,
> > so that HAVE_VSNPRINTF is not defined?
> 
> Configure should check for it, but checking is not possible for
> cross-compilations. Should we add an option for this case?

Perhaps.

> It would be nice if the autotools give support for an optional "emulation
> environment", for a better configuration and an easier testing process...

I wonder why the #define's in config.h are not protected by #ifndef,
so that the user could set the value to 0. I mean that the general
form for macros set by default should have been:

#ifndef HAVE_VSNPRINTF
#define HAVE_VSNPRINTF 1
#elif HAVE_VSNPRINTF == 0
#undef HAVE_VSNPRINTF
#endif

FYI, about the snprintf bug in MinGW:

  https://sourceforge.net/p/mingw-w64/bugs/709/
  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1000101

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Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
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