RE: c++/10065: -pedantic has strange side effects; what is accept ed in -std=c++98

RE: c++/10065: -pedantic has strange side effects; what is accept ed in -std=c++98

[Baldwin, Arthur W]

The following reply was made to PR c++/10065; it has been noted by GNATS.

From: "Baldwin, Arthur W" <Arthur.Baldwin@gd-ais.com>
To: "'giovannibajo@libero.it'" <giovannibajo@libero.it>,
        "Baldwin, Arthur W" <Arthur.Baldwin@gd-ais.com>,
        "'gcc-bugs@gcc.gnu.org'"
	 <gcc-bugs@gcc.gnu.org>,
        "'gcc-prs@gcc.gnu.org'" <gcc-prs@gcc.gnu.org>,
        "'nobody@gcc.gnu.org'" <nobody@gcc.gnu.org>,
        "'gcc-gnats@gcc.gnu.org'"
	 <gcc-gnats@gcc.gnu.org>
Cc:  
Subject: RE: c++/10065: -pedantic has strange side effects; what is accept
	ed in -std=c++98
Date: Mon, 19 May 2003 08:25:26 -0400

 I do not understand the resolution of this problem.  The response below says
 in part:
 
     Variable sized array are not supposed to be disabled with
     -ansi or -std=c++98 because they can't possibly conflict
     with well-formed ISO programs.
 
 The reason I reported the issue is that I cannot compile a program with
 variable sized arrays with flags such as -ansi or -std=c++98.  The compiler
 (gcc-3.2.2 on Linux) issues errors and aborts the build.  With -pedantic,
 however, I get a warning, but the build completes. Older versions of the
 compiler handled the variable sized arrays without any flags.
 
 The question is:  Does gcc support variable sized arrays or not, and will
 the compiler support the variable sized arrays into the future?  We have
 legacy, delivered code that exploits the variable-sized array capability of
 an older compiler, and I have to know whether we should prepare to rewrite
 the code in a maintenance upgrade when we evolve to a new OS and new
 compiler.  At the moment, the only way I could redeliver the code would be
 to compile with -pedantic, and then explain away the warnings.  Without
 -pedantic, IT WON'T COMPILE.
 
 Sorry if I'm being dense about the response, but it doesn't seem to address
 my concern.
 
 Art Baldwin
 
 .............................................
 Art Baldwin
 General Dynamics Advanced Information Systems
 100 Plastics Avenue
 Pittsfield, MA  01201
 arthur.baldwin@gd-ais.com
 413.494.2583
 
 
 > -----Original Message-----
 > From: giovannibajo@libero.it [mailto:giovannibajo@libero.it]
 > Sent: Thursday, May 15, 2003 10:00 PM
 > To: arthur.baldwin@gd-ais.com; gcc-bugs@gcc.gnu.org;
 > gcc-prs@gcc.gnu.org; nobody@gcc.gnu.org
 > Subject: Re: c++/10065: -pedantic has strange side effects; what is
 > accepted in -std=c++98
 > 
 > 
 > Synopsis: -pedantic has strange side effects; what is 
 > accepted in -std=c++98
 > 
 > State-Changed-From-To: analyzed->closed
 > State-Changed-By: bajo
 > State-Changed-When: Fri May 16 01:59:54 2003
 > State-Changed-Why:
 >     Can't see a reason to keep this open. The problem with
 >     -pedantic converting errors to warning is already handled
 >     in c++/10032.
 >     Variable sized array are not supposed to be disabled with
 >     -ansi or -std=c++98 because they can't possibly conflict
 >     with well-formed ISO programs. The official way to disable
 >     extension is to use -pedantic, and -pedantic correctly
 >     reports a warning about it.
 > 
 > http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&
 database=gcc&pr=10065