I'm guessing because mingw is providing a special implementation for printf
(and related functions) that supports %zu instead of linking to the old C89
one, but the GCC attribute checker is not aware of that.
On Fri, Jan 3, 2020 at 12:43 PM jp charras <jp.char...@wanadoo.fr> wrote:
> After some tests:
>
> printf("test %zu", size_t(1) );
>
> works, and there is no compil warning.
>
> Functions that generate a warning about %zu format are:
> StrPrintf()
> OUTPUTFORMATTER::Print()
> (see richio.h)
>
> they have the attribute:
> __attribute__ ((format (printf, 2, 3)))
> or
> __attribute__ ((format (printf, 3, 4)))
>
> And therefore GCC verify the format and the variable argument list, like
> for a printf.
>
> For some reason, %zu is seen as valid for printf, but not for functions
> having the printf attribute.
>
>
> Le 03/01/2020 à 16:16, Mark Roszko a écrit :
> > wxWidgets has a interesting maze of macros to determine how to do
> > printf on Windows. I wonder what it ends up doing. There is a special
> > case just for MINGW32 but not MINGW64.
> >
> >
> https://github.com/wxWidgets/wxWidgets/blob/cc931612eec2e3ea49200ebff45042135f3c3f9c/include/wx/wxcrtvararg.h#L84
> >
> >
> > On Fri, Jan 3, 2020 at 10:05 AM jp charras <jp.char...@wanadoo.fr>
> wrote:
> >>
> >> Le 03/01/2020 à 15:58, Jon Evans a écrit :
> >>> So maybe it's a 32-bits vs 64-bits thing.
> >>> If you add a line like
> >>> #define __USE_MINGW_ANSI_STDIO 1
> >>> at the top of that source file, does it work?
> >>
> >> No.
> >> I still have the compil message:
> >> warning: unknown conversion type character 'z' in format [-Wformat=]
> >>
> >>>
> >>> On Fri, Jan 3, 2020 at 9:32 AM jp charras <jp.char...@wanadoo.fr
> >>> <mailto:jp.char...@wanadoo.fr>> wrote:
> >>>
> >>> Le 03/01/2020 à 15:10, Jon Evans a écrit :
> >>> > I found it defined in
> >>> >
> >>>
> C:\msys64\mingw64\include\c++\8.3.0\x86_64-w64-mingw32\bits\os_defines.h
> >>> > on my machine.
> >>> > @JP -- what platform did you use (Windows version / MSYS version
> /
> >>> etc)
> >>> > where you saw the issue?
> >>>
> >>> I confirm the %zu is not working on my install.
> >>>
> >>> m_out->Print( aNestLevel+1, "(drawings %zu)\n",
> >>> aBoard->Drawings().size() );
> >>>
> >>> generates the warning:
> >>> warning: unknown conversion type character 'z' in format
> [-Wformat=]
> >>>
> >>> on my install:
> >>>
> >>> Platform: Windows 7 (build 7601, Service Pack 1), 32 bit, Little
> endian,
> >>> wxMSW
> >>> Build Info:
> >>> wxWidgets: 3.1.3 (wchar_t,wx containers)
> >>> Boost: 1.71.0
> >>> OpenCASCADE Community Edition: 6.8.0
> >>> Curl: 7.66.0
> >>> Compiler: GCC 9.2.0 with C++ ABI 1013
> >>>
> >>> And I never saw %zu working on my W7 32 bits install.
> >>>
> >>>
> >>> >
> >>> > On Fri, Jan 3, 2020 at 9:02 AM Seth Hillbrand <
> s...@kipro-pcb.com
> >>> <mailto:s...@kipro-pcb.com>
> >>> > <mailto:s...@kipro-pcb.com <mailto:s...@kipro-pcb.com>>> wrote:
> >>> >
> >>> > On 2020-01-02 17:19, Jon Evans wrote:
> >>> >
> >>> > > Hi all,
> >>> > >
> >>> > > Context:
> >>> > >
> >>>
> https://gitlab.com/kicad/code/kicad/merge_requests/28#note_264910682
> >>> > >
> >>> > > I have heard there are issues using "%zu" format specifier
> on
> >>> > > Windows/mingw, because mingw links against a very old
> >>> Windows library
> >>> > > that does not support the C99 standard.
> >>> > >
> >>> > > I have also heard that this isn't an issue anymore because
> of
> >>> > > __USE_MINGW_ANSI_STDIO in wxWidgets.
> >>> > >
> >>> > > I tried to reproduce this problem on my Windows 10 machine
> but
> >>> > couldn't
> >>> > > -- using %zu works fine.
> >>> > >
> >>> > > Does anyone know if this is still a problem on any of our
> >>> supported
> >>> > > platforms?
> >>> > >
> >>> > > Thanks,
> >>> > > -Jon--
> Jean-Pierre CHARRAS
>
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