* bug#22385: 24.5; Build failure with modules on OpenBSD
@ 2016-01-16 17:43 Joakim Jalap
2016-01-17 16:22 ` Philipp Stephani
2016-01-17 22:30 ` Paul Eggert
0 siblings, 2 replies; 4+ messages in thread
From: Joakim Jalap @ 2016-01-16 17:43 UTC (permalink / raw)
To: 22385
[-- Attachment #1: Type: text/plain, Size: 1186 bytes --]
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
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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])], [])
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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''
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Recent messages:
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Describe-Function...
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bbdb-com bbdb bbdb-site timezone notmuch hl-line notmuch-message
notmuch-maildir-fcc notmuch-hello notmuch-tree notmuch-show
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notmuch-parser notmuch-wash diff-mode coolj notmuch-query goto-addr
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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))
^ permalink raw reply related [flat|nested] 4+ messages in thread
* bug#22385: 24.5; Build failure with modules on OpenBSD
2016-01-16 17:43 bug#22385: 24.5; Build failure with modules on OpenBSD Joakim Jalap
@ 2016-01-17 16:22 ` Philipp Stephani
2016-01-17 22:30 ` Paul Eggert
1 sibling, 0 replies; 4+ messages in thread
From: Philipp Stephani @ 2016-01-17 16:22 UTC (permalink / raw)
To: Joakim Jalap, 22385
[-- Attachment #1: Type: text/plain, Size: 22823 bytes --]
Thanks for reporting. I guess this should also reported against
autoconf-archive because the m4 file is from there (
https://www.gnu.org/software/autoconf-archive/How-to-contribute.html). More
generally, a test for a GCC-style attribute should use the __has_attribute
builtin if available and only resort to brittler methods such as warning
output checks if the builtin is unavailable.
Joakim Jalap <joakim.jalap@fastmail.com> schrieb am Sa., 16. Jan. 2016 um
19:25 Uhr:
>
> 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
>
>
>
> 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
> global-semantic-idle-scheduler-mode: t
> global-semanticdb-minor-mode: t
> semantic-mode: t
> erc-notifications-mode: t
> erc-list-mode: t
> erc-menu-mode: t
> erc-autojoin-mode: t
> erc-ring-mode: t
> erc-networks-mode: t
> erc-pcomplete-mode: t
> erc-track-mode: t
> erc-match-mode: t
> erc-button-mode: t
> erc-fill-mode: t
> erc-stamp-mode: t
> erc-netsplit-mode: t
> erc-irccontrols-mode: t
> erc-noncommands-mode: t
> erc-move-to-prompt-mode: t
> erc-readonly-mode: t
> w3m-fb-mode: t
> global-hl-line-mode: t
> diff-auto-refine-mode: t
> global-company-mode: t
> company-mode: t
> TeX-PDF-mode: t
> TeX-source-correlate-mode: t
> flx-ido-mode: t
> ido-everywhere: t
> global-undo-tree-mode: t
> undo-tree-mode: t
> global-auto-revert-mode: t
> projectile-global-mode: t
> projectile-mode: t
> tooltip-mode: t
> electric-indent-mode: t
> mouse-wheel-mode: t
> menu-bar-mode: t
> file-name-shadow-mode: t
> global-font-lock-mode: t
> font-lock-mode: t
> auto-composition-mode: t
> 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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> /usr/local/share/emacs/24.5/lisp/org/ox-ascii
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> /usr/local/share/emacs/24.5/lisp/org/org-agenda
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> /home/joakim/.emacs.d/elpa/org-20151005/org hides
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> /home/joakim/.emacs.d/elpa/org-20151005/org-info hides
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> /home/joakim/.emacs.d/elpa/org-20151005/ob hides
> /usr/local/share/emacs/24.5/lisp/org/ob
> /home/joakim/.emacs.d/elpa/org-20151005/ox-icalendar hides
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> system-font-setting font-render-setting move-toolbar gtk x-toolkit x
> multi-tty emacs)
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^ permalink raw reply [flat|nested] 4+ messages in thread
* bug#22385: 24.5; Build failure with modules on OpenBSD
2016-01-16 17:43 bug#22385: 24.5; Build failure with modules on OpenBSD Joakim Jalap
2016-01-17 16:22 ` Philipp Stephani
@ 2016-01-17 22:30 ` Paul Eggert
2016-01-17 23:58 ` Gabriele Svelto
1 sibling, 1 reply; 4+ messages in thread
From: Paul Eggert @ 2016-01-17 22:30 UTC (permalink / raw)
To: Joakim Jalap; +Cc: Gabriele Svelto, 22385-done
[-- Attachment #1: Type: text/plain, Size: 1179 bytes --]
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
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: 0001-Port-cleanup-attribute-to-OpenBSD.patch --]
[-- Type: text/x-diff; name="0001-Port-cleanup-attribute-to-OpenBSD.patch", Size: 9668 bytes --]
From 1addf499c8318ecf2b00e1c60dfa56e67bc1689e Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Sun, 17 Jan 2016 14:10:26 -0800
Subject: [PATCH] Port cleanup attribute to OpenBSD
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
The OpenBSD C compiler issues false alarms about strcpy, strcat, and
sprintf, and this messes up 'configure' when it tests for the cleanup
attribute. Work around the problem by using __has_attribute directly.
Problem reported by Joakim Jalap (Bug#22385).
* configure.ac: Don’t use AX_GCC_VAR_ATTRIBUTE.
* m4/ax_gcc_var_attribute.m4: Remove.
* src/conf_post.h (__has_attribute): Provide a substitute, for
non-GCC or older GCC compilers. All uses changed to assume
the substitute. Check for the cleanup attribute.
* src/emacs-module.c (module_has_cleanup): Just use __has_attribute.
---
configure.ac | 1 -
m4/ax_gcc_var_attribute.m4 | 141 ---------------------------------------------
src/conf_post.h | 28 +++++----
src/emacs-module.c | 3 +-
4 files changed, 18 insertions(+), 155 deletions(-)
delete mode 100644 m4/ax_gcc_var_attribute.m4
diff --git a/configure.ac b/configure.ac
index 8c01aba..3aeba22 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3327,7 +3327,6 @@ if test "${HAVE_MODULES}" = yes; then
fi
AC_SUBST(MODULES_OBJ)
AC_SUBST(LIBMODULES)
-AX_GCC_VAR_ATTRIBUTE(cleanup)
AC_CHECK_FUNCS(dladdr)
### Use -lpng if available, unless '--with-png=no'.
diff --git a/m4/ax_gcc_var_attribute.m4 b/m4/ax_gcc_var_attribute.m4
deleted file mode 100644
index d12fce8..0000000
--- a/m4/ax_gcc_var_attribute.m4
+++ /dev/null
@@ -1,141 +0,0 @@
-# ===========================================================================
-# http://www.gnu.org/software/autoconf-archive/ax_gcc_var_attribute.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-# AX_GCC_VAR_ATTRIBUTE(ATTRIBUTE)
-#
-# DESCRIPTION
-#
-# This macro checks if the compiler supports one of GCC's variable
-# attributes; many other compilers also provide variable attributes with
-# the same syntax. Compiler warnings are used to detect supported
-# attributes as unsupported ones are ignored by default so quieting
-# warnings when using this macro will yield false positives.
-#
-# The ATTRIBUTE parameter holds the name of the attribute to be checked.
-#
-# If ATTRIBUTE is supported define HAVE_VAR_ATTRIBUTE_<ATTRIBUTE>.
-#
-# The macro caches its result in the ax_cv_have_var_attribute_<attribute>
-# variable.
-#
-# The macro currently supports the following variable attributes:
-#
-# aligned
-# cleanup
-# common
-# nocommon
-# deprecated
-# mode
-# packed
-# tls_model
-# unused
-# used
-# vector_size
-# weak
-# dllimport
-# dllexport
-# init_priority
-#
-# Unsupported variable attributes will be tested against a global integer
-# variable and without any arguments given to the attribute itself; the
-# result of this check might be wrong or meaningless so use with care.
-#
-# LICENSE
-#
-# Copyright (c) 2013 Gabriele Svelto <gabriele.svelto@gmail.com>
-#
-# Copying and distribution of this file, with or without modification, are
-# permitted in any medium without royalty provided the copyright notice
-# and this notice are preserved. This file is offered as-is, without any
-# warranty.
-
-#serial 3
-
-AC_DEFUN([AX_GCC_VAR_ATTRIBUTE], [
- AS_VAR_PUSHDEF([ac_var], [ax_cv_have_var_attribute_$1])
-
- AC_CACHE_CHECK([for __attribute__(($1))], [ac_var], [
- AC_LINK_IFELSE([AC_LANG_PROGRAM([
- m4_case([$1],
- [aligned], [
- int foo __attribute__(($1(32)));
- ],
- [cleanup], [
- int bar(int *t) { return *t; };
- ],
- [common], [
- int foo __attribute__(($1));
- ],
- [nocommon], [
- int foo __attribute__(($1));
- ],
- [deprecated], [
- int foo __attribute__(($1)) = 0;
- ],
- [mode], [
- long foo __attribute__(($1(word)));
- ],
- [packed], [
- struct bar {
- int baz __attribute__(($1));
- };
- ],
- [tls_model], [
- __thread int bar1 __attribute__(($1("global-dynamic")));
- __thread int bar2 __attribute__(($1("local-dynamic")));
- __thread int bar3 __attribute__(($1("initial-exec")));
- __thread int bar4 __attribute__(($1("local-exec")));
- ],
- [unused], [
- int foo __attribute__(($1));
- ],
- [used], [
- int foo __attribute__(($1));
- ],
- [vector_size], [
- int foo __attribute__(($1(16)));
- ],
- [weak], [
- int foo __attribute__(($1));
- ],
- [dllimport], [
- int foo __attribute__(($1));
- ],
- [dllexport], [
- int foo __attribute__(($1));
- ],
- [init_priority], [
- struct bar { bar() {} ~bar() {} };
- bar b __attribute__(($1(65535/2)));
- ],
- [
- m4_warn([syntax], [Unsupported attribute $1, the test may fail])
- int foo __attribute__(($1));
- ]
- )], [
- m4_case([$1],
- [cleanup], [
- int foo __attribute__(($1(bar))) = 0;
- foo = foo + 1;
- ],
- []
- )])
- ],
- 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], [no])])
- ])
-
- 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])], [])
-
- AS_VAR_POPDEF([ac_var])
-])
diff --git a/src/conf_post.h b/src/conf_post.h
index 98ff12e..5c332a0 100644
--- a/src/conf_post.h
+++ b/src/conf_post.h
@@ -51,10 +51,21 @@ typedef bool bool_bf;
#endif
#endif
-/* When not using Clang, assume its attributes and features are absent. */
+/* Simulate __has_attribute on compilers that lack it. It is used only
+ on arguments like alloc_size that are handled in this simulation. */
#ifndef __has_attribute
-# define __has_attribute(a) false
-#endif
+# define __has_attribute(a) __has_attribute_##a
+# define __has_attribute_alloc_size (4 < __GNUC__ + (3 <= __GNUC_MINOR__))
+# define __has_attribute_cleanup (3 < __GNUC__ + (4 <= __GNUC_MINOR__))
+# define __has_attribute_externally_visible \
+ (4 < __GNUC__ + (1 <= __GNUC_MINOR__))
+# define __has_attribute_no_address_safety_analysis false
+# define __has_attribute_no_sanitize_address \
+ (4 < __GNUC__ + (8 <= __GNUC_MINOR__))
+#endif
+
+/* Simulate __has_feature on compilers that lack it. It is used only
+ to define ADDRESS_SANITIZER below. */
#ifndef __has_feature
# define __has_feature(a) false
#endif
@@ -222,9 +233,7 @@ extern int emacs_setenv_TZ (char const *);
#define NO_INLINE
#endif
-#if (__clang__ \
- ? __has_attribute (externally_visible) \
- : (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)))
+#if __has_attribute (externally_visible)
#define EXTERNALLY_VISIBLE __attribute__((externally_visible))
#else
#define EXTERNALLY_VISIBLE
@@ -253,9 +262,7 @@ extern int emacs_setenv_TZ (char const *);
# define ATTRIBUTE_MALLOC
#endif
-#if (__clang__ \
- ? __has_attribute (alloc_size) \
- : 4 < __GNUC__ + (3 <= __GNUC_MINOR__))
+#if __has_attribute (alloc_size)
# define ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
#else
# define ATTRIBUTE_ALLOC_SIZE(args)
@@ -278,8 +285,7 @@ extern int emacs_setenv_TZ (char const *);
/* Attribute of functions whose code should not have addresses
sanitized. */
-#if (__has_attribute (no_sanitize_address) \
- || 4 < __GNUC__ + (8 <= __GNUC_MINOR__))
+#if __has_attribute (no_sanitize_address)
# define ATTRIBUTE_NO_SANITIZE_ADDRESS \
__attribute__ ((no_sanitize_address)) ADDRESS_SANITIZER_WORKAROUND
#elif __has_attribute (no_address_safety_analysis)
diff --git a/src/emacs-module.c b/src/emacs-module.c
index b5e044e..79a077b 100644
--- a/src/emacs-module.c
+++ b/src/emacs-module.c
@@ -35,8 +35,7 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
\f
/* Feature tests. */
-/* True if __attribute__ ((cleanup (...))) works, false otherwise. */
-#ifdef HAVE_VAR_ATTRIBUTE_CLEANUP
+#if __has_attribute (cleanup)
enum { module_has_cleanup = true };
#else
enum { module_has_cleanup = false };
--
2.5.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* bug#22385: 24.5; Build failure with modules on OpenBSD
2016-01-17 22:30 ` Paul Eggert
@ 2016-01-17 23:58 ` Gabriele Svelto
0 siblings, 0 replies; 4+ messages in thread
From: Gabriele Svelto @ 2016-01-17 23:58 UTC (permalink / raw)
To: Paul Eggert, Joakim Jalap; +Cc: 22385-done
Hello Paul,
thanks for getting in touch about this. There's a way to fix this issue
in my macro and it's by running the test twice with and without the
attribute and comparing the compiler error output instead of simply
assuming that any error output means that the attribute is not
supported. It's something I had considered doing in the beginning but
deemed unnecessarily complicated at the time. Turns out I was wrong;
I'll try to push a fix into autoconf-archive in the next few days.
Gabriele
On 17/01/2016 23:30, Paul Eggert wrote:
> 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
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2016-01-17 23:58 UTC | newest]
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2016-01-16 17:43 bug#22385: 24.5; Build failure with modules on OpenBSD Joakim Jalap
2016-01-17 16:22 ` Philipp Stephani
2016-01-17 22:30 ` Paul Eggert
2016-01-17 23:58 ` Gabriele Svelto
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