[SCM] GNU Autoconf source repository branch, master, updated. v2.69-124-gf6156ba

[Paul Eggert]

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- Log -----------------------------------------------------------------
commit f6156ba05083625751a23fe2df1cd6694f42f356
Author: Paul Eggert <address@hidden>
Date:   Thu Aug 7 17:16:40 2014 -0700

    autoconf: modernize AC_C_VARARRAYS for C11
    
    * lib/autoconf/c.m4 (AC_C_VARARRAYS): Define __STDC_NO_VLA__ if
    VLAs are not supported, as this is what C11 does.  The old macro
    HAVE_C_VARARRAYS is still defined if they are supported, but is
    now obsolescent.  Also, check for VLA bug in GCC 3.4.3.
    * doc/autoconf.texi (C Compiler), NEWS: Document the above.

commit 8a8e0756756e0981d8b33c63ff55cd08182b3d67
Author: Paul Eggert <address@hidden>
Date:   Thu Aug 7 16:08:49 2014 -0700

    doc: Solaris 11 supports $(...)
    
    * doc/autoconf.texi (Shell Substitutions): Say that $(...) isn't
    working in Solaris 10 and earlier, not in "recent releases".

commit c1fa7dc412a5ee12c76c064a913138dbeadd6e9b
Author: Paul Eggert <address@hidden>
Date:   Thu Aug 7 15:03:38 2014 -0700

    doc: modernize character encoding
    
    * doc/autoconf.texi: Specify @documentencoding UTF-8.  Don't abuse
    '`' to mean open quote, unless Texinfo already interprets it that
    way.  Be more careful about hyphen versus minus versus endash
    versus emdash.

-----------------------------------------------------------------------

Summary of changes:
 NEWS              |    6 ++++
 doc/autoconf.texi |   69 ++++++++++++++++++++++++++++------------------------
 lib/autoconf/c.m4 |   52 +++++++++++++++++++++++++++++++++++----
 3 files changed, 89 insertions(+), 38 deletions(-)

diff --git a/NEWS b/NEWS
index 3f66825..6e2aabd 100644
--- a/NEWS
+++ b/NEWS
@@ -31,6 +31,12 @@ GNU Autoconf NEWS - User visible changes.
 
 - New macro AC_C__GENERIC.
 
+- AC_C_VARARRAYS now defines __STDC_NO_VLA__ if variable-length
+  arrays are not supported and if the compiler does not already
+  define __STDC_NO_VLA__.  This is for compatibility with C11.
+  For backward compatibility with Autoconf 2.61-2.69 AC_C_VARARRAYS
+  still defines HAVE_C_VARARRAYS, but this usage is obsolescent.
+
 - AC_CONFIG_MACRO_DIRS
   New macro, used to declare multiple directories when looking for
   local M4 macros.  This macro overcomes some of the shortfalls in the
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 4a4ee81..83e6643 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -4,6 +4,7 @@
 @setfilename autoconf.info
 @include version.texi
 @settitle Autoconf
address@hidden UTF-8
 @setchapternewpage odd
 @ifnothtml
 @setcontentsaftertitlepage
@@ -39,16 +40,16 @@
 @c Because we want to drop out the AC_ part of the macro names in the
 @c printed manual, but not in the other outputs, we need a layer above
 @c the usual @acindex{} etc.  That's why we first define indexes such as
address@hidden acx meant to become the macro @acindex.  First of all, using 
``ac_''
address@hidden does not work with makeinfo, and using ``ac1'' doesn't work with 
TeX.
address@hidden So use something more regular ``acx''.  Then you finish with a 
printed
address@hidden index saying ``index is not existent''.  Of course: you ought to 
use
address@hidden acx meant to become the macro @acindex.  First of all, using 
'ac_'
address@hidden does not work with makeinfo, and using 'ac1' doesn't work with 
TeX.
address@hidden So use something more regular 'acx'.  Then you finish with a 
printed
address@hidden index saying 'index is not existent'.  Of course: you ought to 
use
 @c two letters :(  So you use capitals.
 @c
 @c Second, when defining a macro in the TeX world, following spaces are
 @c eaten.  But then, since we embed @acxindex commands that use the end
 @c of line as an end marker, the whole things wrecks itself.  So make
address@hidden sure you do *force* an additional end of line, add a 
address@hidden''.
address@hidden sure you do *force* an additional end of line, add a '@c'.
 @c
 @c Finally, you might want to get rid of TeX expansion, using --expand
 @c with texi2dvi.  But then you wake up an old problem: we use macros
@@ -72,7 +73,7 @@
 @defcodeindex AT
 @c Define an M4sugar macro index that @defmac doesn't write to.
 @defcodeindex MS
address@hidden Define an index for *foreign* programs: `mv' etc.  Used for the
address@hidden Define an index for *foreign* programs: 'mv' etc.  Used for the
 @c portability sections and so on.
 @defindex pr
 
@@ -210,7 +211,7 @@ This manual (@value{UPDATED}) is for GNU Autoconf
 a package for creating scripts to configure source code packages using
 templates and an M4 macro package.
 
-Copyright @copyright{} 1992-1996, 1998-2014 Free Software Foundation,
+Copyright @copyright{} 1992--1996, 1998--2014 Free Software Foundation,
 Inc.
 
 @quotation
@@ -742,7 +743,7 @@ along that front are welcome, since package maintainers 
form the user
 base of Autoconf); rather, the goal is to make @file{configure}
 painless, portable, and predictable for the end user of each
 @dfn{autoconfiscated} package.  And to this degree, Autoconf is highly
-successful at its goal --- most complaints to the Autoconf list are
+successful at its goal---most complaints to the Autoconf list are
 about difficulties in writing Autoconf input, and not in the behavior of
 the resulting @file{configure}.  Even packages that don't use Autoconf
 will generally provide a @file{configure} script, and the most common
@@ -6503,7 +6504,7 @@ If no @var{includes} are specified, the default includes 
are used
 
 @example
 AC_CHECK_MEMBER([struct passwd.pw_gecos], [],
-                [AC_MSG_ERROR([we need `passwd.pw_gecos'])],
+                [AC_MSG_ERROR([we need 'passwd.pw_gecos'])],
                 [[#include <pwd.h>]])
 @end example
 
@@ -7487,11 +7488,15 @@ for (i = 0; i < n; i++)
 
 @defmac AC_C_VARARRAYS
 @acindex{C_VARARRAYS}
address@hidden __STDC_NO_VLA__
 @cvindex HAVE_C_VARARRAYS
-If the C compiler supports variable-length arrays, define
address@hidden  A variable-length array is an array of automatic
-storage duration whose length is determined at run time, when the array
-is declared.
+If the C compiler does not support variable-length arrays, define the
+macro @code{__STDC_NO_VLA__} to be 1 if it is not already defined.  A
+variable-length array is an array of automatic storage duration whose
+length is determined at run time, when the array is declared.  For
+backward compatibility this macro also defines @code{HAVE_C_VARARRAYS}
+if the C compiler supports variable-length arrays, but this usage is
+obsolescent and new programs should use @code{__STDC_NO_VLA__}.
 @end defmac
 
 @defmac AC_C_TYPEOF
@@ -9875,11 +9880,11 @@ different things.
 @example
 $ @kbd{./configure --silent --config-cache}
 $ @kbd{CC=cc ./configure --silent --config-cache}
-configure: error: `CC' was not set in the previous run
+configure: error: 'CC' was not set in the previous run
 configure: error: changes in the environment can compromise \
 the build
-configure: error: run `make distclean' and/or \
-`rm config.cache' and start over
+configure: error: run 'make distclean' and/or \
+'rm config.cache' and start over
 @end example
 
 @noindent
@@ -9990,7 +9995,7 @@ AC_DEFUN([AC_SHELL_TRUE],
                  (true) 2>/dev/null && my_cv_shell_true_works=yes
                  if test "x$my_cv_shell_true_works" = xyes; then
                    AC_DEFINE([TRUE_WORKS], [1],
-                             [Define if `true(1)' works properly.])
+                             [Define if 'true(1)' works properly.])
                  fi])
 ])
 @end group
@@ -10010,7 +10015,7 @@ AC_DEFUN([AC_SHELL_TRUE],
                  (true) 2>/dev/null && my_cv_shell_true_works=yes])
  if test "x$my_cv_shell_true_works" = xyes; then
    AC_DEFINE([TRUE_WORKS], [1],
-             [Define if `true(1)' works properly.])
+             [Define if 'true(1)' works properly.])
  fi
 ])
 @end group
@@ -10708,7 +10713,7 @@ the one they were implemented with.
 @cindex quadrigraphs
 @cindex @samp{@@S|@@}
 @cindex @samp{@@&t@@}
address@hidden Info cannot handle `:' in index entries.
address@hidden Info cannot handle ':' in index entries.
 @ifnotinfo
 @cindex @samp{@@<:@@}
 @cindex @samp{@@:>@@}
@@ -14041,7 +14046,7 @@ configure scripts.
 @ovindex tmp
 Create, as safely as possible, a temporary sub-directory within
 @var{dir} with a name starting with @var{prefix}.  @var{prefix} should
-be 2-4 characters, to make it slightly easier to identify the owner of
+be 2--4 characters, to make it slightly easier to identify the owner of
 the directory.  If @var{dir} is omitted, then the value of @env{TMPDIR}
 will be used (defaulting to @samp{/tmp}).  On success, the name of the
 newly created directory is stored in the shell variable @code{tmp}.  On
@@ -15572,7 +15577,7 @@ signal 15:
 208
 @end example
 
-This gets even worse if one is using the POSIX `wait' interface to get
+This gets even worse if one is using the POSIX ``wait'' interface to get
 details about the shell process terminations: it will result in the shell
 having exited normally, rather than by receiving a signal.
 
@@ -16028,7 +16033,7 @@ j a0
 @end example
 
 @item address@hidden@var{var}:address@hidden@}
address@hidden Info cannot handle `:' in index entries.
address@hidden Info cannot handle ':' in index entries.
 @ifnotinfo
 @cindex @address@hidden@var{var}:address@hidden@}}
 @end ifnotinfo
@@ -16378,12 +16383,12 @@ and it has most of the problems listed under 
@address@hidden
 
 This construct can be
 nested while this is impossible to do portably with back quotes.
-Unfortunately it is not yet universally supported.  Most notably, even recent
-releases of Solaris don't support it:
+Although it is almost universally supported, unfortunately Solaris 10
+and earlier releases lack it:
 
 @example
 $ @kbd{showrev -c /bin/sh | grep version}
-Command version: SunOS 5.10 Generic 121005-03 Oct 2006
+Command version: SunOS 5.10 Generic 142251-02 Sep 2010
 $ @kbd{echo $(echo blah)}
 syntax error: `(' unexpected
 @end example
@@ -18585,11 +18590,11 @@ nothing.
 The default executable, produced by @samp{cc foo.c}, can be
 
 @itemize
address@hidden @file{a.out} --- usual Posix convention.
address@hidden @file{b.out} --- i960 compilers (including @command{gcc}).
address@hidden @file{a.exe} --- DJGPP port of @command{gcc}.
address@hidden @file{a_out.exe} --- GNV @command{cc} wrapper for DEC C on 
OpenVMS.
address@hidden @file{foo.exe} --- various MS-DOS compilers.
address@hidden @file{a.out} -- usual Posix convention.
address@hidden @file{b.out} -- i960 compilers (including @command{gcc}).
address@hidden @file{a.exe} -- DJGPP port of @command{gcc}.
address@hidden @file{a_out.exe} -- GNV @command{cc} wrapper for DEC C on 
OpenVMS.
address@hidden @file{foo.exe} -- various MS-DOS compilers.
 @end itemize
 
 The C compiler's traditional name is @command{cc}, but other names like
@@ -22555,13 +22560,13 @@ if test "$cache_file" = /dev/null; then
 fi
 @end example
 
address@hidden Leave this use of ``File system'' rendered as one word, but
address@hidden Leave this use of "File system" rendered as one word, but
 @c slightly obfuscated so as not to trigger the syntax-check prohibition.
 @cindex File@/system Hierarchy Standard
 @cindex FHS
 
 Another use of @file{config.site} is for priming the directory variables
address@hidden ``File system'', but slightly obfuscated, as above.
address@hidden "File system", but slightly obfuscated, as above.
 in a manner consistent with the File@/system Hierarchy Standard
 (FHS).  Once the following file is installed at
 @file{/usr/share/config.site}, a user can execute simply
diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4
index b58e42d..a944529 100644
--- a/lib/autoconf/c.m4
+++ b/lib/autoconf/c.m4
@@ -1995,14 +1995,54 @@ AC_DEFUN([AC_C_VARARRAYS],
 [
   AC_CACHE_CHECK([for variable-length arrays],
     ac_cv_c_vararrays,
-    [AC_COMPILE_IFELSE(
-       [AC_LANG_PROGRAM([],
-         [[static int x; char a[++x]; a[sizeof a - 1] = 0; return a[0];]])],
-       [ac_cv_c_vararrays=yes],
-       [ac_cv_c_vararrays=no])])
-  if test $ac_cv_c_vararrays = yes; then
+    [AC_EGREP_CPP([defined],
+       [#ifdef __STDC_NO_VLA__
+       defined
+       #endif
+       ],
+       [ac_cv_c_vararrays='no: __STDC_NO_VLA__ is defined'],
+       [AC_COMPILE_IFELSE(
+         [AC_LANG_PROGRAM(
+            [[/* Test for VLA support.  This test is partly inspired
+                 from examples in the C standard.  Use at least two VLA
+                 functions to detect the GCC 3.4.3 bug described in:
+                 
http://lists.gnu.org/archive/html/bug-gnulib/2014-08/msg00014.html
+                 */
+              #ifdef __STDC_NO_VLA__
+               syntax error;
+              #else
+                extern int n;
+                int B[100];
+                int fvla (int m, int C[m][m]);
+
+                int
+                simple (int count, int all[static count])
+                {
+                  return all[count - 1];
+                }
+
+                int
+                fvla (int m, int C[m][m])
+                {
+                  typedef int VLA[m][m];
+                  VLA x;
+                  int D[m];
+                  static int (*q)[m] = &B;
+                  int (*s)[n] = q;
+                  return C && &x[0][0] == &D[0] && &D[0] == s[0];
+                }
+              #endif
+              ]])],
+         [ac_cv_c_vararrays=yes],
+         [ac_cv_c_vararrays=no])])])
+  if test "$ac_cv_c_vararrays" = yes; then
+    dnl This is for compatibility with Autoconf 2.61-2.69.
     AC_DEFINE([HAVE_C_VARARRAYS], 1,
       [Define to 1 if C supports variable-length arrays.])
+  elif test "$ac_cv_c_vararrays" = no; then
+    AC_DEFINE([__STDC_NO_VLA__], 1,
+      [Define to 1 if C does not support variable-length arrays, and
+       if the compiler does not already define this.])
   fi
 ])
 


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