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From 351a88feee66eda6ce33eb06acdebb8e9c6d6716 Mon Sep 17 00:00:00 2001
From: Pavel Raiskup <praiskup@redhat.com>
Date: Fri, 18 Sep 2015 23:17:07 +0200
Subject: [PATCH] libtoolize: fix infinite recursion in m4
Some projects use this construct in configure.ac:
m4_define([version], m4_include([version]))
pkg_version=version
When the m4_include builtin is undefined (as was done in
libtoolize and extract-trace scripts), the call to this 'version'
macro enters an infinite recursion (until ENOMEM). So rather
re-define all potentially dangerous macros by empty strings,
suggested by Eric Blake.
While we are on it, merge the macro-"blacklist" with similar list
implemented in gettext, except for 'm4_esyscmd'. It's kept
defined because we already trace AC_INIT macro for package
version, while it is often specified by
m4_esyscmd(git-version-gen). Similarly to m4_include, m4_esyscmd
might be opt-in-blacklisted in future.
References:
http://lists.gnu.org/archive/html/libtool/2015-09/msg00000.html
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=764580
* gl/build-aux/extract-trace (_G_mini): Redefine trace-breaking
macros to empty strings rather than undefining those. Use 'dnl'
for comments.
* bootstrap: Likewise, sync with extract-trace.
* NEWS: Document.
* NO-THANKS: Mention Hiroyuki Sato.
Signed-off-by: Pavel Raiskup <praiskup@redhat.com>
---
NEWS | 4 ++++
NO-THANKS | 1 +
bootstrap | 42 +++++++++++++++++++++++++++---------------
gl/build-aux/extract-trace | 42 +++++++++++++++++++++++++++---------------
4 files changed, 59 insertions(+), 30 deletions(-)
diff --git a/gl/build-aux/extract-trace b/gl/build-aux/extract-trace
index 315a32a..c6abd21 100755
--- a/gl/build-aux/extract-trace
+++ b/gl/build-aux/extract-trace
@@ -329,29 +329,41 @@ func_extract_trace ()
# arguments to Autocof functions, but without following
# 'm4_s?include' files.
_G_mini='
- # Initialisation.
+ dnl Initialisation.
m4_changequote([,])
m4_define([m4_copy], [m4_define([$2], m4_defn([$1]))])
m4_define([m4_rename], [m4_copy([$1], [$2])m4_undefine([$1])])
- # Disable these macros.
- m4_undefine([m4_dnl])
- m4_undefine([m4_include])
- m4_undefine([m4_m4exit])
- m4_undefine([m4_m4wrap])
- m4_undefine([m4_maketemp])
+ dnl Replace macros which may abort m4 with a no-op variant.
+ m4_pushdef([m4_assert])
+ m4_pushdef([m4_exit])
+ m4_pushdef([m4_fatal])
+ m4_pushdef([m4_m4exit])
- # Copy and rename macros not handled by "m4 --prefix".
+ dnl Replace macros that might break stderr of m4.
+ m4_pushdef([m4_errprint])
+ m4_pushdef([m4_errprintn])
+ m4_pushdef([m4_include])
+ m4_pushdef([m4_warn])
+
+ dnl Avoid side-effects of tracing by extract-trace.
+ m4_pushdef([m4_maketemp])
+ m4_pushdef([m4_mkstemp])
+
+ dnl TODO: reasons for this
+ m4_pushdef([m4_dnl])
+ m4_pushdef([m4_m4wrap])
+
+ dnl Copy and rename macros not handled by "m4 --prefix".
m4_define([dnl], [m4_builtin([dnl])])
m4_copy([m4_define], [m4_defun])
m4_rename([m4_ifelse], [m4_if])
- m4_ifdef([m4_mkstemp], [m4_undefine([m4_mkstemp])])
m4_rename([m4_patsubst], [m4_bpatsubst])
m4_rename([m4_regexp], [m4_bregexp])
- # "m4sugar.mini" - useful m4-time macros for dynamic arguments.
- # If we discover packages that need more m4 macros defined in
- # order to bootstrap correctly, add them here:
+ dnl "m4sugar.mini" - useful m4-time macros for dynamic arguments.
+ dnl If we discover packages that need more m4 macros defined in
+ dnl order to bootstrap correctly, add them here:
m4_define([m4_bmatch],
[m4_if([$#], 0, [], [$#], 1, [], [$#], 2, [$2],
[m4_if(m4_bregexp([$1], [$2]), -1,
@@ -362,11 +374,11 @@ func_extract_trace ()
m4_define([m4_require], [$1])
m4_define([m4_shift3], [m4_shift(m4shift(m4shift($@)))])
- # "autoconf.mini" - things from autoconf macros we care about.
+ dnl "autoconf.mini" - things from autoconf macros we care about.
m4_copy([m4_defun], [AC_DEFUN])
- # Dummy definitions for the macros we want to trace.
- # AM_INIT_AUTOMAKE at least produces no trace without this.
+ dnl Dummy definitions for the macros we want to trace.
+ dnl AM_INIT_AUTOMAKE at least produces no trace without this.
'
_G_save=$IFS
--
2.6.2
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