--- Begin Message ---
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Subject: |
24.5; Build failure with modules on OpenBSD |
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Date: |
Sat, 16 Jan 2016 18:43:40 +0100 |
Hello
I discovered a little problem while trying to build emacs-25 with modules on
OpenBSD-current. The problem is that an assertion fails because
HAVE_ATTRIBUTE_CLEANUP is not true, even though I'm using clang which does
support the cleanup attribute (I think).
This is because the test for whether CC supports that attribute
(m4/ax_gcc_var_attribute.m4 m4/ax_gcc_var_attribute.m4) only checks if there
were warnings issued and if so decides that the compiler has no support. But
OpenBSDs linker (I think it is) outputs the following warnings:
/usr/X11R6/lib/libX11.so.16.1: warning: warning: strcpy() is almost always
misused, please use strlcpy()
/usr/X11R6/lib/libX11.so.16.1: warning: warning: strcat() is almost always
misused, please use strlcat()
/usr/X11R6/lib/libX11.so.16.1: warning: warning: sprintf() is often misused,
please use snprintf()
which are completely unrelated to lack of attribute support.
The attached fix allows me to build. It isn't meant as a real solution,
it's more to illustrate the problem.
I guess another way to go migt be to run this test with empty linker flags, but
I haven't tried that.
Either way, I hope this is of some use.
-- Joakim
diff --git m4/ax_gcc_var_attribute.m4 m4/ax_gcc_var_attribute.m4
index d12fce8..963af5e 100644
--- m4/ax_gcc_var_attribute.m4
+++ m4/ax_gcc_var_attribute.m4
@@ -55,6 +55,11 @@
#serial 3
AC_DEFUN([AX_GCC_VAR_ATTRIBUTE], [
+
+ dnl Temporarily make unknown attributes an error
+ OLDCFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS -Werror=attributes"
+
AS_VAR_PUSHDEF([ac_var], [ax_cv_have_var_attribute_$1])
AC_CACHE_CHECK([for __attribute__(($1))], [ac_var], [
@@ -124,15 +129,12 @@ AC_DEFUN([AX_GCC_VAR_ATTRIBUTE], [
[]
)])
],
- dnl GCC doesn't exit with an error if an unknown attribute is
- dnl provided but only outputs a warning, so accept the attribute
- dnl only if no warning were issued.
- [AS_IF([test -s conftest.err],
- [AS_VAR_SET([ac_var], [no])],
- [AS_VAR_SET([ac_var], [yes])])],
+ [AS_VAR_SET([ac_var], [yes])],
[AS_VAR_SET([ac_var], [no])])
])
+ CFLAGS="$OLDCFLAGS"
+
AS_IF([test yes = AS_VAR_GET([ac_var])],
[AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_VAR_ATTRIBUTE_$1), 1,
[Define to 1 if the system has the `$1' variable attribute])], [])
In GNU Emacs 24.5.1 (x86_64-unknown-openbsd, GTK+ Version 3.18.6)
of 2015-12-09 on amd64.ports.openbsd.org
Windowing system distributor `The X.Org Foundation', version 11.0.11704000
Configured using:
`configure --build=amd64-unknown-openbsd --without-sound
--with-x-toolkit=gtk3 --prefix=/usr/local --sysconfdir=/etc
--mandir=/usr/local/man --infodir=/usr/local/info --localstatedir=/var
--disable-silent-rules --disable-gtk-doc 'CFLAGS=-O2 -pipe -fno-pie'
CPPFLAGS=-I/usr/local/include 'LDFLAGS=-L/usr/local/lib -nopie''
Important settings:
locale-coding-system: nil
Major mode: Org
Minor modes in effect:
show-paren-mode: t
global-linum-mode: t
rich-minority-mode: t
global-cwarn-mode: t
global-git-commit-mode: t
async-bytecomp-package-mode: t
shell-dirtrack-mode: t
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global-undo-tree-mode: t
undo-tree-mode: t
global-auto-revert-mode: t
projectile-global-mode: t
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tooltip-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
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auto-encryption-mode: t
auto-compression-mode: t
column-number-mode: t
line-number-mode: t
auto-fill-function: do-auto-fill
transient-mark-mode: t
Recent messages:
[2 times]
Buffer is read-only
(emacs gnus type)
Buffer is read-only
Describe-Function...
Making completion list...
Quit
Entering debugger...
Back to top level.
Making completion list... [3 times]
gnus-user-agent
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cedet lice mentor xml-rpc url-http tls url-auth url-gw url-scgi
google-translate-smooth-ui google-translate google-translate-default-ui
google-translate-core-ui google-translate-core elfeed-show elfeed-db
elfeed-lib avl-tree elfeed-search elfeed url-queue xml-query
erc-desktop-notifications notifications erc-list erc-menu erc-join
erc-ring erc-networks erc-pcomplete erc-track erc-match erc-button
erc-fill erc-stamp erc-netsplit erc-goodies erc erc-backend erc-compat
gnutls weechat-complete weechat-button weechat weechat-color rx
weechat-relay bindat weechat-core s ucs-normalize conkeror-minor-mode
w3m-lnum w3m-search w3m doc-view jka-compr image-mode w3m-hist w3m-fb
bookmark-w3m w3m-ems w3m-ccl ccl w3m-favicon w3m-image w3m-proc w3m-util
eww-lnum eww mm-url url url-proxy url-privacy url-expand url-methods
url-history url-cookie url-domsuf url-util shr browse-url bbdb-mua
bbdb-com bbdb bbdb-site timezone notmuch hl-line notmuch-message
notmuch-maildir-fcc notmuch-hello notmuch-tree notmuch-show
notmuch-print notmuch-crypto notmuch-mua notmuch-address notmuch-company
notmuch-parser notmuch-wash diff-mode coolj notmuch-query goto-addr
icalendar diary-lib diary-loaddefs notmuch-tag notmuch-lib mm-view
mml-smime smime dig mailcap nnir gnus-sum gnus-group gnus-undo nnmail
mail-source nnoo mbsync smtpmail sendmail gnus-sync gnus-start gnus-spec
gnus-int gnus-range message idna rfc822 mml mml-sec mm-decode mm-bodies
mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mailabbrev
gmm-utils mailheader gnus-win json gnus gnus-ems nnheader mail-utils
wid-edit company-math math-symbol-lists company-auctex yasnippet company
pcase latex tex-style tex dbus xml crm swiper ivy delsel ffap url-parse
auth-source gnus-util mm-util mail-prsvr password-cache url-vars idomenu
imenu ace-link ace-window em-smart esh-var esh-io esh-cmd esh-opt
esh-ext esh-proc esh-arg eldoc esh-groups eshell esh-module esh-mode
esh-util multi-term term disp-table ehelp flx-ido flx ido avy-zap avy
move-text undo-tree diff hydra lv multiple-cursors
mc-hide-unmatched-lines-mode mc-separate-operations
rectangular-region-mode mc-mark-pop mc-mark-more mc-cycle-cursors
mc-edit-lines multiple-cursors-core rect org-table misc
programmers-dvorak quail edmacro kmacro dired+ image-dired image-file
dired-aux dired-x server pinentry autorevert filenotify projectile grep
compile ibuf-ext ibuffer dash thingatpt ignoramus el-get
el-get-autoloading el-get-list-packages el-get-dependencies el-get-build
el-get-status pp el-get-methods el-get-fossil el-get-svn el-get-pacman
el-get-github-zip el-get-github-tar el-get-http-zip el-get-http-tar
el-get-hg el-get-go el-get-git-svn el-get-fink el-get-emacswiki
el-get-http el-get-notify help-mode el-get-emacsmirror el-get-github
el-get-git el-get-elpa el-get-darcs el-get-cvs el-get-bzr el-get-brew
el-get-builtin el-get-apt-get el-get-recipes el-get-byte-compile
el-get-custom el-get-core autoload lisp-mnt dired finder-inf org advice
org-macro org-footnote org-pcomplete pcomplete org-list org-faces
org-entities time-date noutline outline easy-mmode org-version
ob-emacs-lisp ob ob-tangle ob-ref ob-lob ob-table ob-exp org-src ob-keys
ob-comint comint ansi-color ring ob-core ob-eval org-compat org-macs
org-loaddefs format-spec find-func cal-menu calendar cal-loaddefs
tex-site eieio byte-opt bytecomp byte-compile cl-extra cconv eieio-core
help-fns cl-macs cl gv cl-loaddefs cl-lib info easymenu package
epg-config tooltip electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel x-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list newcomment lisp-mode prog-mode register page menu-bar
rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax
facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese
tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak
czech european ethiopic indian cyrillic chinese case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer 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 make-network-process dbusbind gfilenotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty emacs)
Memory information:
((conses 16 1027147 421321)
(symbols 48 76509 1)
(miscs 40 863 1582)
(strings 32 207041 118087)
(string-bytes 1 6146562)
(vectors 16 147798)
(vector-slots 8 3193259 446740)
(floats 8 17152 16902)
(intervals 56 10608 3318)
(buffers 960 31))
--- End Message ---
--- Begin Message ---
|
Subject: |
Re: 24.5; Build failure with modules on OpenBSD |
|
Date: |
Sun, 17 Jan 2016 14:30:46 -0800 |
|
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 |
Thanks for reporting the problem. The OpenBSD compiler warnings about strcpy
etc. are false alarms, and these false alarms confuse the Emacs build procedure
and therefore introduce bugs into the Emacs module code. We're lucky that a
run-time assertion caught this.
I installed the attached patch into the emacs-25 branch. It removes the
offending test in 'configure', and so should fix the bug so I am boldly marking
it as done. Please give the fix a try; if it doesn't work I can unmark the bug.
Is there some way to tell the OpenBSD C compiler to not chatter about uses of
strcpy, strcat, and sprintf? We don't want to use the OpenBSD-suggested
replacements in Emacs, as that would be more likely to introduce bugs than to
fix them. If we can suggest (or get 'configure' to use) a build-time option to
suppress the false alarms that would save everybody some work and would help
make Emacs more reliable.
Although the OpenBSD porting problem with AX_GCC_VAR_ATTRIBUTE no longer affects
Emacs, it might affect other programs that use that macro, so I'll CC: this to
the macro's author Gabriele Svelto. Gabriele, the bug report is here:
http://bugs.gnu.org/22385
0001-Port-cleanup-attribute-to-OpenBSD.patch
Description: Text Data
--- End Message ---