X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fflexmember.m4;h=eb5f2b17906563d5fce0f7ff39e4e09b636c7b2d;hb=93d45a6cea3e8c0959a430e0b3f5ae24fc600399;hp=2a6ae474ec2d6b1696065d5aa827d53c318fd69c;hpb=ef3605f1b2c75155b1525057bbe1e82a38cecd77;p=gnulib.git

diff --git a/m4/flexmember.m4 b/m4/flexmember.m4
index 2a6ae474e..eb5f2b179 100644
--- a/m4/flexmember.m4
+++ b/m4/flexmember.m4
@@ -1,21 +1,10 @@
+# serial 1
 # 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.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
 
 # Written by Paul Eggert.
 
@@ -41,7 +30,11 @@ AC_DEFUN([AC_C_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.])
+       can be used with pre-C99 compilers.
+       When computing the size of such an object, don't use 'sizeof (struct s)'
+       as it overestimates the size.  Use 'offsetof (struct s, d)' instead.
+       Don't use 'offsetof (struct s, d@<:@0@:>@)', as this doesn't work with
+       MSVC and with C++ compilers.])
   else
     AC_DEFINE([FLEXIBLE_ARRAY_MEMBER], 1)
   fi