From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#39857: 27.0.90; Compilation warning about alloca in 32-bit MinGW build Date: Sun, 01 Mar 2020 19:20:31 +0200 Message-ID: <83r1ycyotc.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="82739"; mail-complaints-to="usenet@ciao.gmane.io" To: 39857@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Mar 01 18:21:12 2020 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1j8SHA-000LQj-7Z for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 01 Mar 2020 18:21:12 +0100 Original-Received: from localhost ([::1]:50340 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j8SH9-0003TP-AI for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 01 Mar 2020 12:21:11 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:59018) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j8SH1-0003TB-UJ for bug-gnu-emacs@gnu.org; Sun, 01 Mar 2020 12:21:05 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1j8SH0-00088S-MS for bug-gnu-emacs@gnu.org; Sun, 01 Mar 2020 12:21:03 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:59166) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1j8SH0-00087y-Iq for bug-gnu-emacs@gnu.org; Sun, 01 Mar 2020 12:21:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1j8SH0-0000UY-Ex for bug-gnu-emacs@gnu.org; Sun, 01 Mar 2020 12:21:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 01 Mar 2020 17:21:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: report 39857 X-GNU-PR-Package: emacs X-Debbugs-Original-To: bug-gnu-emacs@gnu.org Original-Received: via spool by submit@debbugs.gnu.org id=B.15830832431814 (code B ref -1); Sun, 01 Mar 2020 17:21:02 +0000 Original-Received: (at submit) by debbugs.gnu.org; 1 Mar 2020 17:20:43 +0000 Original-Received: from localhost ([127.0.0.1]:36906 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1j8SGg-0000TC-K5 for submit@debbugs.gnu.org; Sun, 01 Mar 2020 12:20:42 -0500 Original-Received: from lists.gnu.org ([209.51.188.17]:45428) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1j8SGf-0000T2-5j for submit@debbugs.gnu.org; Sun, 01 Mar 2020 12:20:41 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:58982) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j8SGd-0003Po-MQ for bug-gnu-emacs@gnu.org; Sun, 01 Mar 2020 12:20:41 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:50741) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1j8SGd-0007wA-IE for bug-gnu-emacs@gnu.org; Sun, 01 Mar 2020 12:20:39 -0500 Original-Received: from [176.228.60.248] (port=2198 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1j8SGc-0008MP-V4 for bug-gnu-emacs@gnu.org; Sun, 01 Mar 2020 12:20:39 -0500 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.51.188.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:176730 Archived-At: Building a 32-bit Emacs 27.0.90 with MinGW GCC 8.2 and -Og optimization produces the following compilation warning: CC edittfns.o In file included from lisp.h:24, from editfns.c:36: editfns.c: In function 'styled_format': ../lib/alloca.h:46:18: warning: argument 1 range [2147483648, 4294961362] exceeds maximum object size 2147483647 [-Walloc-size-larger-than=] # define alloca __builtin_alloca lisp.h:4810:49: note: in expansion of macro 'alloca' #define AVAIL_ALLOCA(size) (sa_avail -= (size), alloca (size)) ^~~~~~ lisp.h:4815:9: note: in expansion of macro 'AVAIL_ALLOCA' ? AVAIL_ALLOCA (size) \ ^~~~~~~~~~~~ editfns.c:3167:10: note: in expansion of macro 'SAFE_ALLOCA' info = SAFE_ALLOCA (alloca_size); ^~~~~~~~~~~ ../lib/alloca.h:46:18: note: in a call to built-in allocation function '__builtin_alloca' # define alloca __builtin_alloca lisp.h:4810:49: note: in expansion of macro 'alloca' #define AVAIL_ALLOCA(size) (sa_avail -= (size), alloca (size)) ^~~~~~ lisp.h:4815:9: note: in expansion of macro 'AVAIL_ALLOCA' ? AVAIL_ALLOCA (size) \ ^~~~~~~~~~~~ editfns.c:3167:10: note: in expansion of macro 'SAFE_ALLOCA' info = SAFE_ALLOCA (alloca_size); ^~~~~~~~~~~ The GCC manual says about -Walloc-size-larger-than=N: '-Walloc-size-larger-than=N' Warn about calls to functions decorated with attribute 'alloc_size' that attempt to allocate objects larger than the specified number of bytes, or where the result of the size computation in an integer type with infinite precision would exceed 'SIZE_MAX / 2'. The option argument N may end in one of the standard suffixes designating a multiple of bytes such as 'kB' and 'KiB' for kilobyte and kibibyte, respectively, 'MB' and 'MiB' for megabyte and mebibyte, and so on. '-Walloc-size-larger-than='PTRDIFF_MAX is enabled by default. Warnings controlled by the option can be disabled by specifying N of SIZE_MAX or more. *Note Function Attributes::. I guess __builtin_alloca is "decorated with alloc_size" attribute, and thus the warning. Of course large memory allocations never end up in alloca, we call malloc instead. Which probably means GCC is not smart enough to understand SAFE_ALLOCA? WIBNI this annoying warning could be shut up? TIA. In GNU Emacs 27.0.90 (build 1, i686-pc-mingw32) of 2020-03-01 built on HOME-C4E4A596F7 Windowing system distributor 'Microsoft Corp.', version 5.1.2600 System Description: Microsoft Windows XP Service Pack 3 (v5.1.0.2600) Recent messages: For information about GNU Emacs and the GNU system, type C-h C-a. Configured using: 'configure -C --prefix=/d/usr --with-wide-int --with-modules 'CFLAGS=-Og -gdwarf-4 -g3'' Configured features: XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY W32NOTIFY ACL GNUTLS LIBXML2 HARFBUZZ ZLIB TOOLKIT_SCROLL_BARS MODULES THREADS JSON PDUMPER LCMS2 GMP Important settings: value of $LANG: ENU locale-coding-system: cp1255 Major mode: Lisp Interaction Minor modes in effect: tooltip-mode: t global-eldoc-mode: t eldoc-mode: t electric-indent-mode: t mouse-wheel-mode: t tool-bar-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t line-number-mode: t transient-mark-mode: t Load-path shadows: None found. Features: (shadow sort mail-extr emacsbug message rmc puny dired dired-loaddefs format-spec rfc822 mml easymenu mml-sec password-cache epa derived epg epg-config gnus-util rmail rmail-loaddefs text-property-search time-date subr-x seq byte-opt gv bytecomp byte-compile cconv mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader cl-loaddefs cl-lib sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel dos-w32 ls-lisp disp-table term/w32-win w32-win w32-vars term/common-win tool-bar dnd fontset image regexp-opt fringe tabulated-list replace newcomment text-mode elisp-mode lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core term/tty-colors frame minibuffer cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese composite charscript charprop case-table epa-hook jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice loaddefs button faces cus-face macroexp files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote threads w32notify w32 lcms2 multi-tty make-network-process emacs) Memory information: ((conses 16 51245 8998) (symbols 48 7171 1) (strings 16 18830 2275) (string-bytes 1 532711) (vectors 16 10213) (vector-slots 8 131934 8682) (floats 8 21 109) (intervals 40 252 92) (buffers 888 11))