From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 12970 invoked by alias); 29 Jan 2015 21:55:28 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 12832 invoked by uid 55); 29 Jan 2015 21:55:23 -0000 From: "joseph at codesourcery dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/47781] warnings from custom printf format specifiers Date: Thu, 29 Jan 2015 21:55:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c X-Bugzilla-Version: 4.4.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: enhancement X-Bugzilla-Who: joseph at codesourcery dot com X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2015-01/txt/msg03456.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47781 --- Comment #12 from joseph at codesourcery dot com --- On Thu, 29 Jan 2015, tromey at gcc dot gnu.org wrote: > E.g., firefox has a logging printf that accepts "%hs" to print char16_t* > strings. This extension means that printf checking can't be used here. > Requiring a plugin to deal with this situation would also be difficult. > However letting one write __attribute__((printf, 1, 2, "hs", char16_t*)) > would solve this nicely. Do you then take this as being length modifier 'h' followed by format specifier 's', or is it a complete specifier on its own with everything that would otherwise be length and specifier being reparsed as an extension if it can't be parsed as a standard format? Do the flags "-wp" and "cR" for %s formats apply to this format?