Re: sys_errlist / errno trouble while building an application

["Robert Collins" <robert dot collins at itdomain dot com dot au>]

try searching for sys_errlist on the cygwin archives.

this is a standard porting problem.

Rob

----- Original Message -----
From: "Andreas Eibach" <a.eibach@gmx.net>
To: <cygwin@cygwin.com>
Sent: Sunday, May 06, 2001 4:33 AM
Subject: sys_errlist / errno trouble while building an application


> Hi,
>
> I'm currently *trying* to build xv 3.10a, this old image viewer  [Yes
this
> is an XFree application, and so it would actually belong to the
cygwin-xfree
> list, but in fact it's no XFree problem but will happen with every
console
> application as well. So this should only be considered an example.]
>
> Here's the output (shortened)
>
>
gcc -g -ansi -pedantic -W -Wreturn-type  -Wmissing-prototypes  -O -I/usr
/X11
> R6/include -L
> R6/lib -DDOJPEG -Ijpeg -DDOTIFF -Itiff -DDOPDS         -c xv.c
> xv.c: In function `main':
> xv.c:455: warning: comparison between signed and unsigned
> xv.c: In function `openPic':
>
> --------------------------------------------------------------
> xv.c:2020: `sys_errlist' undeclared (first use in this function)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> xv.c:2020: (Each undeclared identifier is reported only once
> xv.c:2020: for each function it appears in.)
> xv.c:2377: warning: comparison between signed and unsigned
> xv.c:2377: warning: comparison between signed and unsigned
> xv.c:2415: warning: comparison between signed and unsigned
> xv.c:2415: warning: comparison between signed and unsigned
> xv.c: In function `UncompressFile':
> xv.c:2714: `sys_errlist' undeclared (first use in this function)
> xv.c: In function `createMainWindow':
> xv.c:3203: warning: comparison between signed and unsigned
> xv.c:3204: warning: comparison between signed and unsigned
> xv.c:3247: warning: comparison between signed and unsigned
> xv.c:3248: warning: comparison between signed and unsigned
> xv.c: In function `FixAspect':
> xv.c:3398: warning: comparison between signed and unsigned
> xv.c:3406: warning: comparison between signed and unsigned
> xv.c: In function `fixDispNames':
> xv.c:3458: warning: comparison between signed and unsigned
> xv.c:3465: warning: comparison between signed and unsigned
> xv.c: In function `DeleteCmd':
> xv.c:3633: `sys_errlist' undeclared (first use in this function)
> xv.c: In function `HandleDispMode':
> xv.c:3869: warning: comparison between signed and unsigned
> xv.c:3869: warning: comparison between signed and unsigned
> xv.c: In function `add_filelist_to_namelist':
> xv.c:3908: `sys_errlist' undeclared (first use in this function)
> make: *** [xv.o] Error 1
>
>
> As David Robinow pointed out (as posted in the thread 'oldhand
> cygwinner...') it's a wise decision to NOT include ANY declarations of
errno
> or sys_errlist into your programs, but as you can see, "sys_errlist
> undeclared" tells me that I _must_ declare it (obviously).
> Well, the declarations in sys/errno.h have a very strange format:
>
> extern __IMPORT _CONST char * _CONST _sys_errlist[];
> extern __IMPORT int _sys_nerr;
>
> Last, it could maybe be useful to understand the problem if I post the
line
> in  xv.c where errno is used:
>
> xv.c, Line #2019f:
>
> --char foostr[512];
> --sprintf (foostr, "Can't open  file '%s'\n\n  %s.", filename,
> ERRSTR(errno));
>
> I hope anyone of you can give me a hint how to solve this compile
problem.
> Thanks in advance,
>
> Andreas
>
>
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>


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