Re: Compilation warnings on MinGW due to Gnulib's wcwidth

[Gavin Smith]

On 18 June 2015 at 16:26, Eli Zaretskii <address@hidden> wrote:
> Building the current Texinfo trunk tip with MinGW produces a barrage
> of compiler warnings like these:
>
>   gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I../..    -Id:/usr/include  -gdwarf-4 
> -g3 -O2 -MT mbscasecmp.o -MD -MP -MF $depbase.Tpo -c -o mbscasecmp.o 
> mbscasecmp.c &&\
>   mv -f $depbase.Tpo $depbase.Po
>   In file included from mbuiter.h:106:0,
>                    from mbscasecmp.c:27:
>   mbchar.h: In function 'mb_width_aux':
>   mbchar.h:249:3: warning: implicit declaration of function 'wcwidth' 
> [-Wimplicit-function-declaration]
>      int w = wcwidth (wc);
>      ^

I don't suppose you have any idea when this problem could have
started? For example, did you manage to compile the texinfo 5.9.93
pretest okay?

You think that the #include_next line is being executed, right, and
you think this is the case because _GL_ALREADY_INCLUDING_WCHAR_H is
defined? It looks like this is only defined if wchar.h in gnulib
indirectly includes itself.

Looking at http://svn.savannah.gnu.org/viewvc/trunk/gnulib/m4/?root=texinfo
and http://svn.savannah.gnu.org/viewvc/trunk/gnulib/lib/?root=texinfo,
nothing jumps out there as a recent change that could explain the
declaration of wcwidth being missing.

It could be helpful if you posted the config.log file, and
gnulib/lib/wchar.h as well.