FYI: AC_SUBST -> m4_pattern_allow

[Akim Demaille]

Index: ChangeLog
from  Akim Demaille  <address@hidden>

        * lib/autoconf/general.m4 (AC_SUBST, AC_SUBST_FILES): Pass $1 to
        m4_pattern_allow.
        Suggested by Alexandre Duret-Lutz.
        * doc/autoconf.texi (Setting Output Variables): Catch up.

Index: NEWS
===================================================================
RCS file: /cvsroot/autoconf/autoconf/NEWS,v
retrieving revision 1.332
diff -u -u -r1.332 NEWS
--- NEWS 29 Nov 2004 21:24:57 -0000 1.332
+++ NEWS 17 Dec 2004 16:16:40 -0000
@@ -1,3 +1,5 @@
+* Major changes in Autoconf 2.59c
+
 * Major changes in Autoconf 2.59b
 
   Released 2004-08-20, by Paul Eggert.
Index: doc/autoconf.texi
===================================================================
RCS file: /cvsroot/autoconf/autoconf/doc/autoconf.texi,v
retrieving revision 1.852
diff -u -u -r1.852 autoconf.texi
--- doc/autoconf.texi 17 Dec 2004 14:32:51 -0000 1.852
+++ doc/autoconf.texi 17 Dec 2004 16:16:41 -0000
@@ -7209,6 +7209,9 @@
 newlines.)
 
 If @var{value} is given, in addition assign it to @var{variable}.
+
+The string @var{variable} is passed to @code{m4_pattern_allow}
+(@pxref{Forbidden Patterns}).
 @end defmac
 
 @defmac AC_SUBST_FILE (@var{variable})
@@ -7228,7 +7231,7 @@
 could contain:
 
 @example
-AC_SUBST_FILE(host_frag)
+AC_SUBST_FILE([host_frag])
 host_frag=$srcdir/conf/sun4.mh
 @end example
 
@@ -7238,6 +7241,9 @@
 @example
 @@host_frag@@
 @end example
+
+The string @var{variable} is passed to @code{m4_pattern_allow}
+(@pxref{Forbidden Patterns}).
 @end defmac
 
 @cindex Previous Variable
Index: lib/autoconf/general.m4
===================================================================
RCS file: /cvsroot/autoconf/autoconf/lib/autoconf/general.m4,v
retrieving revision 1.837
diff -u -u -r1.837 general.m4
--- lib/autoconf/general.m4 17 Dec 2004 14:36:24 -0000 1.837
+++ lib/autoconf/general.m4 17 Dec 2004 16:16:41 -0000
@@ -1890,7 +1890,8 @@
 # Beware that if you change this macro, you also have to change the
 # sed script at the top of _AC_OUTPUT_FILES.
 m4_define([AC_SUBST],
-[m4_ifvaln([$2], [$1=$2])[]dnl
+[m4_pattern_allow([^$1$])dnl
+m4_ifvaln([$2], [$1=$2])[]dnl
 m4_append_uniq([_AC_SUBST_VARS], [$1], [ ])dnl
 ])# AC_SUBST
 
@@ -1899,7 +1900,8 @@
 # -----------------------
 # Read the comments of the preceding macro.
 m4_define([AC_SUBST_FILE],
-[m4_append_uniq([_AC_SUBST_FILES], [$1], [ ])])
+[m4_pattern_allow([^$1$])dnl
+m4_append_uniq([_AC_SUBST_FILES], [$1], [ ])])