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Re: [RFA] Eliminate warnings about snprintf declaration


On Sat, May 14, 2005 at 01:05:51PM +0300, Eli Zaretskii wrote:
> > Date: Thu, 12 May 2005 16:51:03 -0400
> > From: Daniel Jacobowitz <drow@false.org>
> > Cc: gcc-patches@gcc.gnu.org, gdb-patches@sources.redhat.com
> > 
> > > So I need to add these functions to gdb/configure.ac _and_ to
> > > libiberty/configure.ac; got it.  I will post a revised patch soon.
> > > 
> > > Thanks for your patience.
> > 
> > Almost - you don't actually need them in libiberty/configure.ac, unless
> > you see warnings about them during the build of libiberty.  To make GDB
> > -Werror happy, all you need is gdb/configure.ac and
> > include/libiberty.h.
> 
> Actually, I found that a simpler patch to include/libiberty.h (below)
> is all that is needed to fix all the warnings about snprintf and
> vsnprintf.  libiberty.h already does that for asprintf and vasprintf,
> so I think we can use the same method for snprintf and vsnprintf; no
> need to change any configure.ac files.
> 
> Okay?
> 
> 2005-05-14  Eli Zaretskii  <eliz@gnu.org>
> 
> 	* libiberty.h: (snprintf) [!HAVE_DECL_SNPRINTF]: Declare if
> 	needed.
> 	(vsnprintf) [!HAVE_DECL_VSNPRINTF]: Declare if needed.

Note that this will only work if there are no systems which declare
snprintf with an incorrect prototype.  For instance, a missing const on
the format string in a system header would now generate an error.  For
asprintf this isn't an issue, because it's not a standard function;
it's only provided by glibc.

I don't know whether that's a real problem though.  I'll let DJ answer
that :-)

-- 
Daniel Jacobowitz
CodeSourcery, LLC


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