GMP-6.1.2 [mingw32]: t-scanf.exe fails

[Keith Marshall]

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On 28/05/17 10:46, Marc Glisse wrote:
> On Sat, 27 May 2017, Keith Marshall wrote:
> 
>> make[5]: Entering directory `/home/keith/src/mingw/gcc-build/gmp-6.1.2-shared/tests/misc'
>> PASS: t-printf.exe
>> FAIL: t-scanf.exe
>> PASS: t-locale.exe
> 
> Looks related to
> 
> https://gmplib.org/list-archives/gmp-bugs/2017-March/004130.html

Yes, it does appear to be the same, or a very similar issue.

Anyway, I can now confirm it as a bug in wine's sscanf() implementation;
relocating my entire source and build trees to a WinXP VM, deleting the 
t-*.log files throughout, and then re-running "make check", as a native 
platform test, reports no failures whatsoever ... 100% pass rate.

I am astonished that the use of "-D__USE_MINGW_ANSI_STDIO", as noted in 
the previous thread, has any effect whatsoever.  See, I am the author of 
the underlying code for that feature, and I can state, *categorically*, 
that it affects only the behaviour of printf(), and its siblings; it 
has no effect at all, on the behaviour of scanf() and its siblings.  I 
would also point out that, as a "__USE_*" feature test, users should 
*not* define "__USE_MINGW_ANSI_STDIO" themselves; the correct way to 
enable it is to enable any of the "__STRICT_ANSI__" standards options, 
or to stipulate "_GNU_SOURCE", "_POSIX_C_SOURCE", or "_XOPEN_SOURCE" 
feature dependencies, (the latter two with an associated version 
stipulation), any of which will cause the MinGW runtime headers to 
enable "__USE_MINGW_ANSI_STDIO" implicitly.  You may get away with an 
explicit definition today, but I will offer no guarantee that a future 
MinGW Runtime release will not override any such definition, just as 
GNU's glibc headers do for their "__USE_*" feature tests.

- -- 
Regards,
Keith.

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