* MODULES.html.sh (Core language properties): New module flexmember.

* modules/flexmember, m4/flexmember.m4: New files.

diff --git a/ChangeLog b/ChangeLog
index d16ef09f4ffdfbb0a2f39f18cf93b0643598a2e4..8481fd74858476d9d1a59a67b4dce0268b2d6fd6 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2006-11-06  Paul Eggert  <eggert@cs.ucla.edu>
 
+       * MODULES.html.sh (Core language properties): New module flexmember.
+       * modules/flexmember, m4/flexmember.m4: New files.
+
        * lib/xalloc.h (xnmalloc, xnrealloc, x2nrealloc): Now static
        inline functions that are identical with the old xnmalloc_inline,
        xnrealloc_inline, x2nrealloc_inline of lib/xmalloc.c.  This is so

diff --git a/MODULES.html.sh b/MODULES.html.sh
index e7032040f3920f685a5b5acd723286f63d4890eb..f7b16437773522c666eebf84b4c7890cdc9c04a5 100755 (executable)
--- a/MODULES.html.sh
+++ b/MODULES.html.sh
@@ -1704,6 +1704,7 @@ func_all_modules ()
   func_echo "$element"
 
   func_begin_table
+  func_module flexmember
   func_module vararrays
   func_end_table
 

diff --git a/m4/flexmember.m4 b/m4/flexmember.m4
new file mode 100644 (file)
index 0000000..2a6ae47
--- /dev/null
+++ b/m4/flexmember.m4
@@ -0,0 +1,48 @@
+# Check for flexible array member support.
+
+# Copyright (C) 2006 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+
+# Written by Paul Eggert.
+
+AC_DEFUN([AC_C_FLEXIBLE_ARRAY_MEMBER],
+[
+  AC_CACHE_CHECK([for flexible array member],
+    ac_cv_c_flexmember,
+    [AC_COMPILE_IFELSE(
+       [AC_LANG_PROGRAM(
+         [[#include <stdlib.h>
+           #include <stdio.h>
+           #include <stddef.h>
+           struct s { int n; double d[]; };]],
+         [[int m = getchar ();
+           struct s *p = malloc (offsetof (struct s, d)
+                                 + m * sizeof (double));
+           p->d[0] = 0.0;
+           return p->d != (double *) NULL;]])],
+       [ac_cv_c_flexmember=yes],
+       [ac_cv_c_flexmember=no])])
+  if test $ac_cv_c_flexmember = yes; then
+    AC_DEFINE([FLEXIBLE_ARRAY_MEMBER], [],
+      [Define to nothing if C supports flexible array members, and to
+       1 if it does not.  That way, with a declaration like `struct s
+       { int n; double d@<:@FLEXIBLE_ARRAY_MEMBER@:>@; };', the struct hack
+       can be used with pre-C99 compilers.])
+  else
+    AC_DEFINE([FLEXIBLE_ARRAY_MEMBER], 1)
+  fi
+])

diff --git a/modules/flexmember b/modules/flexmember
new file mode 100644 (file)
index 0000000..6d39e14
--- /dev/null
+++ b/modules/flexmember
@@ -0,0 +1,20 @@
+Description:
+Flexible array member support
+
+Files:
+m4/flexmember.m4
+
+Depends-on:
+
+configure.ac:
+AC_C_FLEXIBLE_ARRAY_MEMBER
+
+Makefile.am:
+
+Include:
+
+License:
+GPL
+
+Maintainer:
+Paul Eggert, Jim Meyering